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411 lines
12 KiB
411 lines
12 KiB
;=======================================================================
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;
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; XMHB.Z80 - XMODEMXX PATCH FILE FOR ROMWBW HBIOS
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;
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; Wayne Warthen - wwarthen@gmail.com
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; Updated: 2017-08-09
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;
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;=======================================================================
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;
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; Overlay file is Z80, build with M80:
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; M80 =XMHB
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; L80 XMHB,XMHB/N/X/E
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;
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.Z80
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ASEG
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;
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NO EQU 0
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YES EQU NOT NO
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;
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ERRDET EQU NO ; detect parity/framing/overrun errs
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;
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BASE EQU 100H ; start of cp/m normal program area
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;
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BDOS EQU 00005H ; BDOS function dispatch vector
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;
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;=======================================================================
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;
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; Jump table: The jump table must be in exactly the same sequence as the
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; one in XMODEM. Note the ORG of 103H - This jump table has no jump to
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; 'BEGIN'.
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;
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ORG BASE + 3 ;start after 'JMP BEGIN'
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;
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JP CONOUT ;must be 00000h if not used, see below
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JP MINIT ;initialization routine (if needed)
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JP UNINIT ;undo whatever 'MINIT' did (or return)
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JPTBL:
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JP SENDR ;send character (via pop psw)
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JP CAROK ;test for carrier
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JP MDIN ;receive data byte
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JP GETCHR ;get character from modem
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JP RCVRDY ;check receive ready
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JP SNDRDY ;check send ready
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JP SPEED ;get speed value for file transfer time
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JP EXTRA1 ;extra for custom routine
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JP EXTRA2 ;extra for custom routine
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JP EXTRA3 ;extra for custom routine
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;
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;-----------------------------------------------------------------------
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;
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; Output character to console
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;
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CONOUT EQU 0 ; not used
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;
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;-----------------------------------------------------------------------
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;
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; Initialize modem
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;
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; This procedure has been usurped to dynamically detect the type
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; of system we are running on and install the *real* jump table
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; entries as appropriate.
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;
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MINIT:
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;
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; Announce
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LD DE,RBC ; RetroBrew Computers
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LD C,9 ; BDOS string display function
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CALL BDOS ; Do it
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;
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; Get system type
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LD DE,00202H ; D := 2, E := 2
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MLT DE ; DE := D * E == 4
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BIT 2,E ; Bit 2 wil be set if mlt happend
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LD HL,U_JPTBL ; Assume Z80 (UART)
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LD DE,UART ; UART port notification string
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JR Z,MINIT2 ; Yes, Z80, do vector copy
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LD HL,A_JPTBL ; Otherwise Z180 (ASCI)
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LD DE,ASCI ; ASCI port notification string
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;
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MINIT2:
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; Display port notification string
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PUSH HL ; Save HL
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LD C,9 ; BDOS string display function
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CALL BDOS ; Do it
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POP HL ; Recover HL
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;
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; Copy real vectors into active jump table
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LD DE,JPTBL ; Real jump table is destination
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LD BC,7 * 3 ; Copy 7 3-byte entries
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LDIR ; Do the copy
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;
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; Check for UNA (UBIOS)
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LD A,(0FFFDH) ; fixed location of UNA API vector
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CP 0C3H ; jp instruction?
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JR NZ,MINIT3 ; if not, not UNA
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LD HL,(0FFFEH) ; get jp address
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LD A,(HL) ; get byte at target address
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CP 0FDH ; first byte of UNA push ix instruction
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JR NZ,MINIT3 ; if not, not UNA
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INC HL ; point to next byte
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LD A,(HL) ; get next byte
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CP 0E5H ; second byte of UNA push ix instruction
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JR NZ,MINIT3 ; if not, not UNA
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;
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; Display UNA notification string
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LD DE,UBIOS ; BIOS notification string
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LD C,9 ; BDOS string display function
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CALL BDOS
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;
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; Get CPU speed from UNA and return
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LD C,0F8H ; UNA BIOS Get PHI function
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RST 08 ; Returns speed in Hz in DE:HL
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LD A,E ; Hack to get approx speed in MHz
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SRL A ; ... by dividing by 1,048,576
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SRL A ; ...
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SRL A ; ...
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SRL A ; ...
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INC A ; Fix up for value truncation
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RET ; Done
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;
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MINIT3:
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; Not UNA, try RomwBW HBIOS for CPU speed lookup
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LD HL,(0FFFEH) ; HL := HBIOS ident location
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LD A,'W' ; First byte of ident
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CP (HL) ; Compare
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JR NZ,MINIT4 ; Not HBIOS
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INC HL ; Next byte of ident
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LD A,~'W' ; Second byte of ident
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CP (HL) ; Compare
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JR NZ,MINIT4 ; Not HBIOS
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;
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; Display RomWBW notification string
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LD DE,HBIOS ; BIOS notification string
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LD C,9 ; BDOS string display function
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CALL BDOS ; Do it
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;
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; Get CPU speed from RomWBW HBIOS and return
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LD B,0F8H ; HBIOS SYSGET function 0xF8
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LD C,0F0H ; CPUINFO subfunction 0xF0
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RST 08 ; Do it, L := CPU speed in MHz
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LD A,L ; Move it to A
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RET ; Done
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;
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MINIT4:
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; Neither UNA nor RomWBW
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LD DE,BIOERR ; BIOS error message
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LD C,9 ; BDOS string display function
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CALL BDOS ; Do it
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JP 0 ; Bail out!
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;
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RBC DB "RBC, 28-Aug-2017, $"
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;
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UART DB "UART0$"
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ASCI DB "ASCI0$"
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;
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UBIOS DB " [UNA]", 13, 10, "$"
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HBIOS DB " [WBW]", 13, 10, "$"
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;
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BIOERR DB 13, 10, 13, 10, "*** Unknown BIOS ***", 13, 10, "$"
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;
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;-----------------------------------------------------------------------
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;
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; Uninitialize modem
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;
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UNINIT:
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RET ; not initialized, so no 'UN-INITIALIZE'
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;
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;-----------------------------------------------------------------------
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;
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; The following are all dummy routines that are unused because MINIT
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; dynamically installs the real jump table.
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;
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SENDR:
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CAROK:
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MDIN:
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GETCHR:
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RCVRDY:
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SNDRDY:
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SPEED:
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EXTRA1:
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EXTRA2:
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EXTRA3:
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RET
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;
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;=======================================================================
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;=======================================================================
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;
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; Standard RBC Projects 8250-like UART port @ 68H
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;
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; Will be used for all RBC Z80 systems.
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;
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;=======================================================================
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;=======================================================================
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;
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; UART port constants
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;
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U_BASE EQU 68H ; UART base port
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U_DATP EQU U_BASE + 0 ; data in port
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U_DATO EQU U_BASE + 0 ; data out port
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U_CTLP EQU U_BASE + 5 ; control/status port
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U_SNDB EQU 20H ; bit to test for send ready
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U_SNDR EQU 20H ; value when ready to send
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U_RCVB EQU 01H ; bit to test for receive ready
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U_RCVR EQU 01H ; value when ready to receive
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U_PARE EQU 04H ; bit for parity error
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U_OVRE EQU 02H ; bit for overrun error
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U_FRME EQU 08H ; bit for framing error
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;
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; Following jump table is dynamically patched into real jump
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; table at program startup. See MINIT above. Note that only a
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; subset of the jump table is overlaid (SENDR to SPEED).
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;
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U_JPTBL:
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JP U_SENDR ; send character (via pop psw)
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JP U_CAROK ; test for carrier
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JP U_MDIN ; receive data byte
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JP U_GETCHR ; get character from modem
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JP U_RCVRDY ; check receive ready
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JP U_SNDRDY ; check send ready
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JP U_SPEED ; get speed value for file transfer time
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;
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;-----------------------------------------------------------------------
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;
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; Send character on top of stack
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;
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U_SENDR:
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POP AF ; get character to send from stack
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OUT (U_DATO),A ; send to port
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test and rep;ort carrier status, Z set if carrier present
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;
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U_CAROK:
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XOR A ; not used, always indicate present
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Get a character (assume character ready has already been tested)
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;
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U_MDIN:
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U_GETCHR:
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IN A,(U_DATP) ; read character from port
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test for character ready to receive, Z = ready
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; Error code returned in A register
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; *** Error code does not seem to be used ***
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;
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U_RCVRDY:
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IN A,(U_CTLP) ; get modem status
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;
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IF ERRDET
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;
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; With error detection (slower)
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PUSH BC ; save scratch register
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PUSH AF ; save full status on stack
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AND U_FRME | U_OVRE | U_PARE ; isolate line err bits
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LD B,A ; save err status in B
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POP AF ; get full status back
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AND U_RCVB ; isolate ready bit
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CP U_RCVR ; test it (set flags)
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LD A,B ; get the error code back
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POP BC ; restore scratch register
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;
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ELSE
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;
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; No error detection (faster)
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AND U_RCVB ; isolate ready bit
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CP U_RCVR ; test it (set flags)
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LD A,0 ; report no line errors
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;
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ENDIF
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;
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test for ready to send a character, Z = ready
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;
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U_SNDRDY:
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IN A,(U_CTLP) ; get status
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AND U_SNDB ; isolate transmit ready bit
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CP U_SNDR ; test for ready value
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Report baud rate (index into SPTBL returned in regsiter A)
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;
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U_SPEED:
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LD A,8 ; arbitrarily return 9600 baud
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RET
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;
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;=======================================================================
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;=======================================================================
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;
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; Standard RBC Projects Z180 primary ASCI port
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;
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; Will be used for all RBC Z180 systems.
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;
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;=======================================================================
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;=======================================================================
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;
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; ASCI port constants
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;
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A_DATP EQU 48H ;Z180 TSR - ASCI receive data port
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A_DATO EQU 46H ;Z180 TDR - ASCI transmit data port
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A_CTLP EQU 44H ;Z180 STAT - ASCI status port
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A_CTL2 EQU 40H ;Z180 CNTLA - ASCI control port
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A_SNDB EQU 02H ;Z180 STAT:TDRE - xmit data reg empty bit
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A_SNDR EQU 02H ;Z180 STAT:TDRE - xmit data reg empty value
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A_RCVB EQU 80H ;Z180 STAT:RDRF - rcv data reg full bit
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A_RCVR EQU 80H ;Z180 STAT:RDRF - rcv data reg full value
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A_PARE EQU 20H ;Z180 STAT:PE - parity error bit
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A_OVRE EQU 40H ;Z180 STAT:OVRN - overrun error bit
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A_FRME EQU 10H ;Z180 STAT:FE - framing error bit
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;
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; Following jump table is dynamically patched over initial jump
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; table at program startup. See MINIT above. Note that only a
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; subset of the jump table is overlaid (SENDR to SPEED).
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;
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A_JPTBL:
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JP A_SENDR ;send character (via pop psw)
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JP A_CAROK ;test for carrier
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JP A_MDIN ;receive data byte
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JP A_GETCHR ;get character from modem
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JP A_RCVRDY ;check receive ready
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JP A_SNDRDY ;check send ready
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JP A_SPEED ;get speed value for file transfer time
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;
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;-----------------------------------------------------------------------
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;
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; Send character on top of stack
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;
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A_SENDR:
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POP AF ; get character to send from stack
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OUT0 (A_DATO),A ; send to port
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test and rep;ort carrier status, Z set if carrier present
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;
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A_CAROK:
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XOR A ; not used, always indicate present
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Get a character (assume character ready has already been tested)
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;
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A_MDIN:
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A_GETCHR:
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IN0 A,(A_DATP) ; read character from port
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test for character ready to receive, Z = ready
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; Error code returned in A register
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; *** Error code does not seem to be used ***
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;
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A_RCVRDY:
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IN0 A,(A_CTLP) ; get modem status
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PUSH BC ; save scratch register
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PUSH AF ; save full status on stack
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AND A_FRME | A_OVRE | A_PARE ; isolate line err bits
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LD B,A ; save err status in B
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; Z180 ASCI ports will stall if there are errors.
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; Error bits are NOT cleared by merely reading
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; the status register. Below, bit 3 of ASCI
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; control register is written with a zero to
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; clear error(s) if needed.
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JP Z,A_RCVRDY2 ; if no errs, continue
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IN0 A,(A_CTL2) ; get current control register
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AND 0F7H ; force err reset bit to zero
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OUT0 (A_CTL2),A ; write control register
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A_RCVRDY2:
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POP AF ; get full status back
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AND A_RCVB ; isolate ready bit
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CP A_RCVR ; test it (set flags)
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LD A,B ; get the error code back
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POP BC ; restore scratch register
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Test for ready to send a character, Z = ready
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;
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A_SNDRDY:
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IN A,(A_CTLP) ; get status
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AND A_SNDB ; isolate transmit ready bit
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CP A_SNDR ; test for ready value
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RET
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;
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;-----------------------------------------------------------------------
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;
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; Report baud rate (index into SPTBL returned in regsiter A)
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;
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A_SPEED:
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LD A,8 ; arbitrarily return 9600 baud
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RET
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;
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END
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