116 lines
1.4 KiB
ArmAsm
116 lines
1.4 KiB
ArmAsm
#
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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bdos: ! BDOS entry point
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out 0xff
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ora a
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ret
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COLDSTART: ! system startup entry point --- this needs to be four bytes after FBASE.
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jmp boot ! 0: Cold start routine
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bios:
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jmp wboot ! 1: Warm boot - reload command processor
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jmp const ! 2: Console status
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jmp conin ! 3: Console input
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jmp conout ! 4: Console output
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jmp list ! 5: Printer output
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jmp punch ! 6: Paper tape punch output
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jmp reader ! 7: Paper tape reader input
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jmp home ! 8: Move disc head to track 0
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jmp seldsk ! 9: Select disc drive
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jmp settrk !10: Set track number
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jmp setsec !11: Set sector number
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jmp setdma !12: Set DMA address
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jmp read !13: Read a sector
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jmp write !14: Write a sector
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boot:
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xra a
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sta 3 ! iobyte
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sta 4 ! drive
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! falls through
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wboot:
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mvi a, 0xc3 ! jmp
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sta 0
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sta 5
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lxi h, bios
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shld 1
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lxi h, bdos
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shld 6
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lda 4 ! get the current drive/user
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mov c, a
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out 1
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const:
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out 2
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ora a
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ret
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conin:
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out 3
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ora a
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ret
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conout:
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out 4
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ora a
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ret
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list:
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out 5
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ora a
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ret
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punch:
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out 6
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ora a
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ret
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reader:
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out 7
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ora a
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ret
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home:
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out 8
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ora a
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ret
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seldsk:
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out 9
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ora a
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ret
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settrk:
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out 10
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ora a
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ret
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setsec:
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out 11
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ora a
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ret
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setdma:
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out 12
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ora a
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ret
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read:
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out 13
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ora a
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ret
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write:
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out 14
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ora a
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ret
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