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RomWBW/Source/HBIOS/API.txt

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==========================
HBIOS Management Functions
==========================
RESET ($F0):
B=Function A=Result
VER ($F1):
B=Function A=Result
C=Reserved (set to 0) DE=Version (Maj/Min/Upd/Pat)
L=Platform Id
SETBNK ($F2):
B=Function A=Result
C=Bank Id C=Previous Bank Id
GETBNK ($F3):
B=Function A=Result
C=Bank Id
SETCPY ($F4):
B=Function A=Result
D=Destination Bank Id
E=Source Bank Id
HL=Count of Bytes to Copy
BNKCPY ($F5):
B=Function A=Result
DE=Destination Address
HL=Source Address
ALLOC ($F6):
B=Function A=Result
HL=Size HL=Address of Allocated Memory Block
FREE ($F7):
B=Function A=Result
HL=Address of Memory Block to Free
GET ($F8):
BC=Function/Subfunction A=Result
Subfunctions:
CIOCNT ($00):
BC=Function/Subfunction A=Result
E=Serial Unit Count
DIOCNT ($10):
BC=Function/Subfunction A=Result
E=Disk Unit Count
VDACNT ($40):
BC=Function/Subfunction A=Result
E=Video Unit Count
TIMER ($D0):
BC=Function/Subfunction A=Result
DE:HL=Timer Value (32 bit)
BOOTINFO ($E0):
BC=Function/Subfunction A=Result
DE=Boot Volume (Disk Unit/Slice)
L=Boot Bank Id
CPUINFO ($F0):
BC=Function/Subfunction A=Result
H=Z80 CPU Variant
L=CPU Speed in MHz
DE=CPU Speed in KHz
MEMINFO ($F1):
BC=Function/Subfunction A=Result
D=# ROM Banks
E=# RAM Banks
BNKINFO ($F2):
BC=Function/Subfunction A=Result
D=BIOS Bank Id
E=User Bank Id
SET ($F9):
BC=Function/Subfunction A=Result
TIMER ($D0):
BC=Function/Subfunction A=Result
DE:HL=Timer Value (32 bit)
BOOTINFO ($E0):
BC=Function/Subfunction A=Result
DE=Boot Volume (Disk Unit/Slice)
L=Boot Bank Id
PEEK ($FA):
B=Function A=Result
D=Bank E=Byte Value
HL=Address
POKE ($FB):
B=Function A=Result
D=Bank
E=Byte Value
HL=Address
INT ($FC): Interrupt vector management functions
BC=Function/Subfunction A=Result
Subfunctions:
INTINF ($00): Query interrupt system information
BC=Function/Subfunction A=Result
D=Interrupt Mode
E=Interrupt Vector Table Size
Report interrupt interrupt management system information.
Interrupt Mode:
0: Interrupts disabled
1: Z80 Interrupt Mode 1 active
2: Z80 Interrupt Mode 2 active
Interrupt Vector Table Size:
If interrupts are disabled, this will be zero. if interrupt mode 1, this
will be the number of entries in the interrupt call list. if interrupt mode
2, this will be the number of slots in the interrupt vector table.
INTGET ($10): Get interrupt vector
BC=Function/Subfunction A=Result
E=Interrupt Vector Table Position HL=Interrupt Vector
Return the Interrupt Vector for the specified Interrupt Vector Table Position.
INTSET ($20): Set interrupt vector
BC=Function/Subfunction A=Result
HL=Interrupt Vector HL=Previous Vector
E=Interrupt Vector Table Position DE=Interrupt Routing Engine Address
Set the Interrupt Vector for the specified Interrupt Vector Table Position to the
specified Interrupt Vector. The previous value at the specified table position
will be returned. The Vector Table Position is a zero-based index into the
interrupt vector table and must specify a position less than or equal to the
size of the table.
The new interrupt vector must point to a proper interrupt handler located in the
top 32K of CPU address space. Note that during interrupt processing, the lower
32K of CPU address space will contain the RomWBW HBIOS code bank, not the lower
32K of application TPA. As such, a dynamically installed interrupt handler does
not have access to the lower 32K of TPA and must be careful to avoid modifying
the contents of the lower 32K of memory. Invoking RomWBW HBIOS functions within
an interrupt handler is not supported. The interrupt management framework takes
care of saving and restoring AF, BC, DE, HL, and IY. Any other registers modified
must be saved and restored by the interrupt handler.
Interrupt handlers are different for IM1 or IM2.
For IM1:
The new interrupt handler is responsible for chaining (JP) to the previous vector
if the interrupt is not handled. The interrupt handler must return with ZF set
if interrupt is handled and ZF cleared if not handled.
For IM2:
The interrupt handler requires an invocation stub separate from the actual interrupt
handling code. The stub must be:
PUSH HL
LD HL,<adr of actual interrupt handler>
JP <adr of int routing engine>
When calling Set Interrupt Vector, the address of the stub must be provided for the
Interrupt Vector parameter. The address of the Interrupt Routing Engine will be
returned in DE and must be inserted into the stub code as indicated above. In the
case of IM2 mode interrutps, the actual interrupt handler should not chain to the
previous entry. The new interrupt handler must assume all responsibilities for
the specific interrupt slot being occupied.
If the caller is transient, then the caller must remove the new interrupt handler and
restore the original one prior to termination. This is accomplished by calling this
function with the Interrupt Vector set to the Previous Vector returned in the original
call.
The caller is responsible for disabling interrupts prior to making an INTSET call and
enabling them afterwards. The caller is responsible for ensuring that a valid interrupt
handler is installed prior to enabling any hardware interrupts associated with the handler.
Also, if the handler is transient, the caller must disable the hardware interrupt(s)
associated with the handler prior to uninstalling it.
================
Serial Functions
================
IN ($00):
BC=Function/Unit A=Result
E=Byte Input
Wait for a single character to be available at the specified device and return the character in E. Function
will wait indefinitely for a character to be available.
OUT ($01):
BC=Function/Unit A=Result
E=Character to Output
Wait for device to be ready to send a character, then send the character specified in E.
IST ($02):
BC=Function/Unit A=Result
*E=# Bytes Pending
OST ($03):
BC=Function/Unit A=Result
*E=# Buffer Bytes Available
INIT ($04):
BC=Function/Unit A=Result
DE=Line Characteristics
L=Terminal Type?
Setup Parameter Word:
_______________________________ _______________________________
| | | encoded || | | | | |
| |rts| Baud Rate ||dtr|xon| parity |stp| 8/7/6 |
|_______|___|___|_______________||___|___|___________|___|_______|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
D register E register
_______________________________ _______________________________
| | | || | | | | |
| 0 0 |AFE|LP OT2 OT1 RTS DTR||DLB|BRK|STK EPS PEN|STB| WLS |
|_______|___|___________________||___|___|___________|___|_______|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
-- MCR -- -- LCR --
_______________________________ _______________________________
| | re| te|~rs| er|8/7 pe stp|| | | | | | |
| 0 | 1 | 1 | 0 | 0 | m2 m1 m0|| 0 | 0 | ps|peo| dr| SSS |
|___|___|___|___|___|___________||___|___|___|___|___|___________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CNTLA0 CNTLB0
QUERY ($05)
BC=Function/Unit A=Result
DE=Line Characteristics (Baud, Flow Control, etc.)
L=Terminal Type? (TTY, VT-100, etc.)
DEVICE ($06):
BC=Function/Unit A=Result
D=Device Type
E=Device Number
C=Device Attributes
Serial Device Attributes Byte:
7: 0=RS-232, 1=Terminal
If Terminal, 3-0 is attached Video Unit #
==============
Disk Functions
==============
STATUS ($10):
BC=Function/Unit A=Result
Return current status result code of specified unit. Does not clear
the status.
RESET ($11):
BC=Function/Unit A=Result
Reset the physical interface associated with the specified unit. Flag all units
associated with the interface for unit initialization at next I/O call. Clear
media identified unless locked. Reset result code of all associated units.
SEEK ($12):
BC=Function/Unit A=Result
D:7=Address Type (0=CHS, 1=LBA)
CHS: D:0-6=Head,E=Sector,HL=Track
LBA: DE:HL
Seek function establishes current sector for next I/O function for the specified
unit. A seek must precede read/write/verify function calls. Physical seek is
typically deferred until subsequent I/O operation.
READ ($13) / WRITE ($14) / VERIFY ($15):
BC=Function/Unit A=Result
HL=Buffer Address E=Blocks Read
E=Block Count
Read, write, or verify block count sectors to buffer address starting at current target
sector. Current sector must be established by prior seek function; however, multiple
read/write/verify function calls can be made after a seek function. Current sector is
incremented after each sector successfully read. On error, current sector is sector is
sector where error occurred. Blocks read indicates number of sectors successfully read.
Caller must ensure buffer address is large enough to contain data for all sectors
requested.
FORMAT ($16):
BC=Function/Unit A=Result
CHS: D=Head, HL=Cylinder
E=Fill Byte
Format the designated track using the current media_id. Many devices
do not support a true format operation. If so, format should write
sectors with designated fill byte.
*** Need to specify interleave/sector id's somehow.
DEVICE ($17)
BC=Function/Unit A=Result
D=Device Type (MD, FD, IDE, etc.)
E=Device Number (0..n)
C=Device Attributes
Report the Device Type (Floppy, IDE, SD, etc.) and Device Number. Call
does not perform any I/O and succeeds even if the device is in an error state.
It does not reset the unit status.
Disk Device Attributes Byte:
7: 1=Floppy, 0=Hard Disk (or similar, e.g. CF, SD, RAM)
If Floppy:
6-5: Form Factor (0=8", 1=5.25", 2=3.5", 3=Other)
4: Sides (0=SS, 1=DS)
3-2: Density (0=SD, 1=DD, 2=HD, 3=ED)
1-0: Reserved
If Hard Disk:
6: Removable
5-3: Type (0=Hard, 1=CF, 2=SD, 3=USB, 4=ROM, 5=RAM, 6=RAMF, 7=?)
2-0: Reserved
Note: IDE value 848Ah in IDENTIFY DEVICE data word 0 indicates CF Card
MEDIA ($18):
BC=Function/Unit A=Result
E:0=Enable Media Discovery E=Media ID (legacy)
Report the media definition for media in specified unit. If bit 0 of E is
set, then perform media discovery or verification. If no media in device,
return no media error.
DEFMED ($19):
BC=Function/Unit A=Result
E=Media ID (legacy)
Define media in unit.
CAPACITY ($1A):
BC=Function/Unit A=Result
DE:HL=Blocks on Device
BC=Block Size
Report current media capacity information.
If media is unknown, return error (no media)
GEOMETRY ($1B):
BC=Function/Unit A=Result
HL=Cylinders
D:0-6=Heads
D:7=LBA Capable
E=Sectors
BC=Block Size
Report current media geometry information.
If media is unknown, return error (no media)
===============
Video Functions
===============
-----------------------------------------------------------------------------------
Unit Device Type Capacity/Mode
---------- ---------- ---------------- --------------------
Disk 0 MD0: ROM Disk 384K, LBA
Disk 1 MD1: RAM Disk 384K, LBA
Disk 2 FD0: Floppy Disk 3.5", DS/HD, CHS
Disk 3 FD1: Floppy Disk 5.25", DS/HD, CHS
Disk 4 PPIDE0: Hard Disk 2345M, LBA
Disk 5 IDE0: Compact Flash 2048M, LBA
Disk 6 SD0: SD Card 4096M, LBA
Disk 7 PRPSD0: SD Card 2048M, LBA
Disk 8 RF0: RAM Floppy 4M, LBA
Serial 0 UART0: RS-232 38400,8N1,HFC
Serial 1 PRPCON0: Terminal Video 0
Serial 2 CVDU0: Terminal Video 1
Serial 3 VDU0: Terminal Video 2
Serial 4 TMS0: Terminal Video 3
Video 0 PRPCON0: CRT Text 80x25, ANSI
Video 1 CVDU0: CRT Text 80x25, ANSI
Video 2 VDU0: CRT Text 80x25, ANSI
Video 3 TMS0: CRT Text 40x25, TTY
Video 4 NEC0 CRT Graphics 600x400
Unit: Function Group & Unit Index
Device: <driver>_DEVICE Device Type & Device Num
Type: <driver>_DEVICE Type & Attributes
Capacity/Mode:
Disk: <driver>_DEVICE Attributes & <driver>_CAPACITY
Serial: <driver>_QUERY
Video: <driver>_QUERY
-----------------------------------------------------------------------------------
<VDA>_INIT:
- INIT CRT HARDWARE
- INIT KEYBOARD HARDWARE
- CALL <VDA>_VDARES (<NO PARMS>)
- ADD OURSELVES TO VDA_TBL
- CALL TERM_ATTACH (C=VIDEO UNIT, DE=<VDA>_DISPATCH)
<VDA>_VDARES: (<NO PARMS>)
- HOME CURSOR
- CLEAR SCREEN
- RETURN (A=STATUS)
TERM_ATTACH: (C=VIDEO UNIT, DE=<VDA>_DISPATCH)
- CALL <EMU>_INIT (B=TERM DEV NUM, C=VIDEO UNIT, DE=<VDA>_DISPATCH)
- ADD OURSELVES TO CIO_TBL USING <EMU>_DISPATCH
- RETURN (A=STATUS)
<EMU>_INIT: (B=TERM DEV NUM, C=VIDEO UNIT, DE=<VDA>_DISPATCH)
- SAVE TERM DEV NUM TO <EMU>_DEVNUM
- SAVE VIDEO UNIT TO <EMU>_VDAUNIT
- SAVE <VDA>_DISPATCH TO <EMU>_VDADISPADR
- CALL <EMU>_RESET (<NO PARMS>)
- RETURN (DE=<EMU>_DISPATCH, A=STATUS)
<EMU>_RESET: (<NO PARMS>)
- QUERY ATTACHED VDA FOR SCREEN SIZE (VIA <EMU>_VDADISP)
- INITIALIZE ALL WORKING VARIABLES AND EMULATOR STATE
- RETURN (A=STATUS)