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113 lines
3.3 KiB
113 lines
3.3 KiB
TITLE "ROMWBW HBIOS Clock Interface"
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SUBTTL "Description of Clock Module"
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;===================================================================
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; WBWCLK.Z80
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; HBIOS Clock driver for RomWBW System Software
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; Wayne Warthen
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; Version: 31 Mar 2020
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;===================================================================
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VERS EQU 11
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.Z80
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NAME WBWCLK
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MACLIB CLOCK.LIB
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COMMON /_CLKID/
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DESCST: DEFW 0 ; Pointer to static year value if required
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CLKNAM: DEFB 'RomWBW HBIOS Clock ' ; Exactly 24 chars in name
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DEFB VERS/10+'0','.',VERS MOD 10 +'0',0
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DESCR: DEFB 'RomWBW Series HBIOS Clock',0
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IF [$-DESCST] > 256
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OVER2
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ENDIF
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PAGE
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SUBTTL "Configurable Clock Hardware Parameters"
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COMMON /_PARM_/
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PARBAS: DEFW 0 ; # of parameters (Set to 00 if none)
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DEFW 0 ; Pointer to STRS (Set to 00 if none)
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CSEG
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;-----------------------------------------------------------
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; Z S D O S C L O C K H E A D E R
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;-----------------------------------------------------------
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; Enter: HL points to a 6-byte buffer to Get/Set time
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; Exit : A=1 on Success, A=FFH if error
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; HL points to last char in buffer
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; E contains original seconds (HL+5)
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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; R e a d / W r i t e t h e C l o c k
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;- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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PRGBAS: JP GETTIM ; Jump to Read Clock
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JP WRCLK ; Jump to Set Clock
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;
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GETTIM: PUSH HL ; Save final buffer pointer
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LD HL,TIMBUF ; Point to temp buf for HBIOS read
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LD B,20H ; HBIOS Read Clock function = $20
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RST 08 ; Call HBIOS to get time
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LD HL,TIMBUF ; Source is start of temp buf
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POP DE ; Destination is buffer provided originally
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JR NZ,ERRRET ; Error return
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LD BC,5 ; Copy just the first 5 bytes
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LDIR ; Do it
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LD A,(DE) ; Save the original seconds value
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INC BC ; Setup to copy final byte (BC := 1)
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LDIR ; Do the last byte (seconds)
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EX DE,HL ; Setup HL to point to seconds for return
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DEC HL ; Need to dec HL back to seconds adr
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LD D,0 ; Tenths of seconds is always zero
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LD E,A ; Original seconds value to E
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LD A,1 ; Signal success
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RET ; Done
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;
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WRCLK: LD DE,TIMBUF ; Copy to temp buf
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LD BC,6 ; 6 bytes
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LDIR ; Do it
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LD HL,TIMBUF ; Point to temp buf for HBIOS call
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LD B,21H ; Set clock function
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RST 08 ; Call HBIOS to set the time
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JR NZ,ERRRET ; Error return
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LD A,1 ; Signal success
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RET ; Done
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;
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ERRRET: OR 0FFH ; Error
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RET ; Done
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;
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TIMBUF DEFS 6 ; Temp date/time buffer
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PAGE
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SUBTTL "Run-Time Configuration of Ports and Masks"
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; This code installs configurable items into the clock module
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; Enter with DE pointing to the physical address of the relocatable module
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COMMON /_POST_/
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RET ; This RETURN MUST be present even if no other
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; code is included in this section
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COMMON /_PRE_/
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;---------------------------------------------------------------
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; Read clock and wait for seconds to roll - watchdog protected
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; Enter with: DE pointing to relocated clock read routine
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; HL pointing to base of high module
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; This module is executed just prior to installing the module to insure
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; that a valid clock is present
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; Enter with DE pointing to beginning of relocated clock CSEG
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COMMON /_PRE_/
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INCLUDE PRECLOCK.LIB
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END
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