Mini Dos machine
I am (was) currently working on a mini i86 DOS machine.
An old modified PC-XT board serve as a test platform for the homemade BIOS.
All IO’s – keyboard, VGA Display, floppy disk, RS232 will be handle by a propeller chip board.
To date,
INT10 (video) and
INT 16 (keyboard) are working.
I am currently working on INT13 (disk) function.
An image disk of DOS 3.1 will be on a SD flash drive connected to the propeller chip.
To date, with INT13 AH=02 (read); sector 0, side 0, track 0, I am able to load DOS boot sector from the propeller chip.
Some pictures:
Video at:
Extract of propeller keyboard micro-code:
PRI sendKey(request) | dataToSend
dataToSend := 0 ‘ DATA to return to the 8088
if request == KEYB_AVAILABLE
if kb.gotkey
dataToSend := kb.keyNoRetrieveif request == KEYB_GET_KEY
dataToSend := kb.getkeyouta[15..8] := dataToSend
outa[DATA_AVAILABLE_FOR_8088] := 1
waitcnt(Delay_on + cnt) ‘ Wait a moment so the 8088 has time to read itouta[8..15] := 0
outa[DATA_AVAILABLE_FOR_8088] := 0
waitcnt(Delay_off + cnt)return 0
Extract of Mini DOS Machine BIOS:
; Project: MINI DOS MACHINE BIOS
; Auteur: Alain Boudreault (VE2CUY)
; Date: 2010.01.10
;——————————————————————————–.code
ORG 0hstart: jmp cold
include data.inc
COLD: MOV AX,40h
MOV DS,AX
MOV Word ptr DS:72h,0WARM:
include cpu_test.asm
JZ CPU_OK
HALT: HLTCPU_OK:
include init_8xxxChips.asm
include Get_MemSize.asm
include Install_int_vectors.asm
ifdef INST_BASIC_ROM
include Inst_Basic_Rom.asm
endifinclude Check_Devices.asm
…
Why don’t you release the project so we can all rebuilt this?
If you are not willing to do so, please write it here because people are confused.
Because the project is far from over. But my BIOS source code is available on request.
I was wondering if you had an update on the status of this. I’d be very interested in your BIOS source code and any schematics you might have.
Hello,
Maybe You can send to me Your bios source code and schematic diagram for this very interested project ?
Best Regards Michael from Poland