167 lines
2.4 KiB
NASM
167 lines
2.4 KiB
NASM
; 8K of onboard RAM
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.equ RAMSTART 0xc000
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.equ USER_RAMSTART 0xc200
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; Memory register at the end of RAM. Must not overwrite
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.equ RAMEND 0xddd0
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jp init
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; *** JUMP TABLE ***
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jp strncmp
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jp addDE
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jp addHL
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jp upcase
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jp unsetZ
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jp intoDE
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jp intoHL
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jp writeHLinDE
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jp findchar
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jp parseHex
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jp parseHexPair
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jp blkSel
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jp blkSet
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jp fsFindFN
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jp fsOpen
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jp fsGetB
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jp fsPutB
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jp fsSetSize
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jp cpHLDE
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jp parseArgs
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jp printstr
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jp _blkGetB
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jp _blkPutB
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jp _blkSeek
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jp _blkTell
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jp printcrlf
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jp stdioPutC
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jp stdioReadLine
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.fill 0x66-$
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retn
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.inc "err.h"
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.inc "ascii.h"
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.inc "core.asm"
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.inc "parse.asm"
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.inc "sms/kbd.asm"
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.equ KBD_RAMSTART RAMSTART
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.equ KBD_FETCHKC smskbdFetchKCB
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.inc "kbd.asm"
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.equ VDP_RAMSTART KBD_RAMEND
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.inc "sms/vdp.asm"
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.equ STDIO_RAMSTART VDP_RAMEND
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.equ STDIO_GETC kbdGetC
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.equ STDIO_PUTC vdpPutC
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.inc "stdio.asm"
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.equ MMAP_START 0xd700
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; 0x180 is to leave some space for the stack
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.equ MMAP_LEN RAMEND-MMAP_START-0x180
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.inc "mmap.asm"
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.equ BLOCKDEV_RAMSTART STDIO_RAMEND
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.equ BLOCKDEV_COUNT 3
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.inc "blockdev.asm"
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; List of devices
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.dw mmapGetB, mmapPutB
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.dw f0GetB, f0PutB
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.dw f1GetB, f1PutB
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.equ FS_RAMSTART BLOCKDEV_RAMEND
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.equ FS_HANDLE_COUNT 2
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.inc "fs.asm"
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.equ SHELL_RAMSTART FS_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 10
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.inc "shell.asm"
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.dw edCmd, zasmCmd, fnewCmd, fdelCmd, fopnCmd, flsCmd, blkBselCmd
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.dw blkSeekCmd, blkLoadCmd, blkSaveCmd
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.inc "blockdev_cmds.asm"
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.inc "fs_cmds.asm"
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.equ PGM_RAMSTART SHELL_RAMEND
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.equ PGM_CODEADDR USER_RAMSTART
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.inc "pgm.asm"
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.out PGM_RAMEND
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init:
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di
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im 1
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ld sp, RAMEND
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; init a FS in mmap
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ld hl, MMAP_START
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ld a, 'C'
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ld (hl), a
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inc hl
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ld a, 'F'
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ld (hl), a
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inc hl
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ld a, 'S'
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ld (hl), a
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call fsInit
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xor a
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ld de, BLOCKDEV_SEL
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call blkSel
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call fsOn
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call kbdInit
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call vdpInit
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call shellInit
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ld hl, pgmShellHook
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ld (SHELL_CMDHOOK), hl
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jp shellLoop
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f0GetB:
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ld ix, FS_HANDLES
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jp fsGetB
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f0PutB:
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ld ix, FS_HANDLES
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jp fsPutB
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f1GetB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsGetB
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f1PutB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsPutB
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edCmd:
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.db "ed", 0, 0, 0b1001, 0, 0
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push hl \ pop ix
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ld l, (ix)
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ld h, (ix+1)
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jp 0x1900
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zasmCmd:
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.db "zasm", 0b1001, 0, 0
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push hl \ pop ix
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ld l, (ix)
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ld h, (ix+1)
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jp 0x1d00
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; last time I checked, PC at this point was 0x183c. Let's give us a nice margin
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; for the start of ed.
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.fill 0x1900-$
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.bin "ed.bin"
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; Last check: 0x1c4e
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.fill 0x1d00-$
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.bin "zasm.bin"
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.fill 0x7ff0-$
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.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
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