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96 lines
1.5 KiB
NASM
96 lines
1.5 KiB
NASM
title 'Skeleton MP/M 1.1 Ldrbios'
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; Copyright (C) 1978, 1979, 1980
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; Digital Research
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; Box 579, Pacific Grove
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; California, 93950
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false equ 0
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true equ not false
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ram$top equ 1d00h ; top address+1
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bios equ ram$top-0600h ; basic input/output system
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bdos equ bios-0e00h ; base of the bdos
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org bios
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buff equ 0080h ;default buffer address
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; jump vector for indiviual routines
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jmp boot
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wboote: jmp wboot
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jmp const
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jmp conin
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jmp conout
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jmp list
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jmp punch
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jmp reader
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jmp home
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jmp seldsk
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jmp settrk
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jmp setsec
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jmp setdma
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jmp read
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jmp write
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jmp list$st ; list status poll
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jmp sect$tran ; sector translation
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boot:
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wboot:
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gocpm:
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ret
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crtin: ; crt: input
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ret
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crtout: ; crt: output
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ret
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crtst: ; crt: status
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ret
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ttyin: ; tty: input
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ret
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ttyout: ; tty: output
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ret
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lptout: ; lpt: output
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ret
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lpt$st:
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ret
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conin equ crtin
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const equ crtst
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conout equ crtout
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reader equ ttyin
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punch equ ttyout
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list equ lptout
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listst equ lptst
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seldsk: ;select disk given by register c
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ret
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;
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home: ;move to home position
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ret
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;
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settrk: ;set track number given by c
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ret
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;
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setsec: ;set sector number given by c
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ret
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;
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setdma: ;set dma address given by regs b,c
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ret
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;
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sect$tran: ; translate the sector # in <c> if needed
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ret
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;
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read: ;read next disk record (assuming disk/trk/sec/dma set)
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ret
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;
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write: ;disk write function
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ret
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;
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end
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