mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-17 08:58:06 +11:00
92ddc7ebc1
Not much of a gain in terms of usability (a bit of a loss in fact, things are a bit slow and glitchy), but it's a necessary move if we want to use upcoming grid-enabled userspace apps, such as a visual text editor.
201 lines
3.4 KiB
NASM
201 lines
3.4 KiB
NASM
; RAMSTART is a label at the end of the file
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.equ RAMEND 0xcfff
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; Address of the *CL driver. Same as in recv.asm
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.equ COM_DRV_ADDR 0x0238
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; in sync with user.h. Last BAS_RAMEND: 0x600b
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.equ USER_CODE 0x6100
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; Free memory in TRSDOS starts at 0x3000
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.org 0x3000
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jp init
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; *** Jump Table ***
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jp strncmp
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jp upcase
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jp findchar
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jp printstr
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jp printcrlf
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jp blkSet
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jp blkSel
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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 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 stdioPutC
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jp stdioReadLine
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.inc "err.h"
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.inc "blkdev.h"
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.inc "fs.h"
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.inc "ascii.h"
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.inc "core.asm"
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.inc "str.asm"
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.inc "trs80/kbd.asm"
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.inc "trs80/vid.asm"
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.equ FLOPPY_RAMSTART RAMSTART
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.inc "trs80/floppy.asm"
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.equ GRID_RAMSTART FLOPPY_RAMEND
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.equ GRID_ROWS TRS80_ROWS
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.equ GRID_COLS TRS80_COLS
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.equ GRID_SETCELL trs80SetCell
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.equ GRID_GETC trs80GetC
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.equ gridPushScr fastPushScr
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.inc "grid.asm"
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.equ BLOCKDEV_RAMSTART GRID_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 floppyGetB, floppyPutB
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.dw blk1GetB, blk1PutB
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.dw blk2GetB, blk2PutB
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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.equ STDIO_GETC gridGetC
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.equ STDIO_PUTC gridPutC
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.equ STDIO_SETCUR gridSetCurH
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.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
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.equ FS_HANDLE_COUNT 2
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.inc "fs.asm"
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; *** BASIC ***
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; RAM space used in different routines for short term processing.
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.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
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.equ SCRATCHPAD FS_RAMEND
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.inc "lib/util.asm"
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.inc "lib/ari.asm"
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.inc "lib/parse.asm"
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.inc "lib/fmt.asm"
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.equ EXPR_PARSE parseLiteralOrVar
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.inc "lib/expr.asm"
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.inc "basic/util.asm"
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.inc "basic/parse.asm"
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.inc "basic/tok.asm"
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.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
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.inc "basic/var.asm"
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.equ BUF_RAMSTART VAR_RAMEND
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.inc "basic/buf.asm"
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.equ BFS_RAMSTART BUF_RAMEND
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.inc "basic/fs.asm"
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.inc "basic/blk.asm"
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.inc "basic/floppy.asm"
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.equ BAS_RAMSTART BFS_RAMEND
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.inc "basic/main.asm"
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.out BAS_RAMEND
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init:
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ld sp, RAMEND
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call gridInit
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call floppyInit
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call fsInit
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call basInit
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ld hl, basFindCmdExtra
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ld (BAS_FINDHOOK), hl
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xor a
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ld de, BLOCKDEV_SEL
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call blkSel
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jp basStart
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; Receive a byte from *cl and put it in A.
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; Returns A > 0xff when receiving the last byte
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recvCmd:
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xor a
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ld (VAR_TBL+1), a ; pre-set MSB
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; put a 0xff mask in B, which will become 0x7f if we receive a 0x20
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ld b, 0xff
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.inner:
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ld a, 0x03 ; @GET
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ld de, COM_DRV_ADDR
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rst 0x28
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jr nz, .maybeerror
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or a
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jr z, .eof ; Sending a straight NULL ends the comm.
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; @PUT that char back
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ld c, a
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ld a, 0x04 ; @PUT
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ld de, COM_DRV_ADDR
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rst 0x28
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ret nz ; error
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ld a, c
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cp 0x20
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jr z, .escapechar
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; not an escape char, good
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and b ; apply mask
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ld (VAR_TBL), a
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xor a ; ensure Z
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ret
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.maybeerror:
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; was it an error?
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or a
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jr z, .inner ; not an error, just loop
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ret ; error
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.escapechar:
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ld b, 0x7f
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jr .inner
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.eof:
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dec a ; A = 0xff
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ld (VAR_TBL+1), a
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xor a ; ensure Z
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ret
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basFindCmdExtra:
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ld hl, basFloppyCmds
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call basFindCmd
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ret z
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ld hl, basBLKCmds
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call basFindCmd
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ret z
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ld hl, basFSCmds
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call basFindCmd
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ret z
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ld hl, .cmds
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call basFindCmd
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ret z
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jp basPgmHook
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.cmds:
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.db "recv", 0
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.dw recvCmd
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.db 0xff ; end of table
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fastPushScr:
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push hl
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ld hl, GRID_BUF
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call trs80PushScr
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pop hl
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ret
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; *** blkdev 1: file handle 0 ***
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blk1GetB:
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ld ix, FS_HANDLES
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jp fsGetB
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blk1PutB:
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ld ix, FS_HANDLES
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jp fsPutB
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; *** blkdev 2: file handle 1 ***
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blk2GetB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsGetB
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blk2PutB:
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ld ix, FS_HANDLES+FS_HANDLE_SIZE
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jp fsPutB
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RAMSTART:
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