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2a55bfd375
We use zasm's ability to use labels in .equ directive. We didn't do it before because for a while, we were in between scas and zasm (scas was used in automated tests) so we needed to use the lowest common denominator: zasm doesn't have macros and scas can't use labels in .equ directives. This forced us to add this layer of indirection. But now that we are completely cut from scas' dependency, we can use this nice zasm's ability.
92 lines
1.6 KiB
NASM
92 lines
1.6 KiB
NASM
; classic RC2014 setup (8K ROM + 32K RAM) and a stock Serial I/O module
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; The RAM module is selected on A15, so it has the range 0x8000-0xffff
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.equ RAMSTART 0x8000
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.equ RAMEND 0xffff
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.equ PGM_CODEADDR 0x9000
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.equ ACIA_CTL 0x80 ; Control and status. RS off.
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.equ ACIA_IO 0x81 ; Transmit. RS on.
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jp init ; 3 bytes
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; *** Jump Table ***
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jp printstr
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jp sdcWaitResp
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jp sdcCmd
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jp sdcCmdR1
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jp sdcCmdR7
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jp sdcSendRecv
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; interrupt hook
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.fill 0x38-$
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jp aciaInt
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.inc "err.h"
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.inc "core.asm"
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.inc "parse.asm"
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.equ ACIA_RAMSTART RAMSTART
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.inc "acia.asm"
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.equ BLOCKDEV_RAMSTART ACIA_RAMEND
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.equ BLOCKDEV_COUNT 2
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.inc "blockdev.asm"
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; List of devices
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.dw sdcGetB, sdcPutB
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.dw blk2GetB, blk2PutB
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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.equ STDIO_GETC aciaGetC
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.equ STDIO_PUTC aciaPutC
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.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
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.equ FS_HANDLE_COUNT 1
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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 11
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.inc "shell.asm"
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.dw sdcInitializeCmd, sdcFlushCmd
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.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
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.dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
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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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.inc "pgm.asm"
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.equ SDC_RAMSTART PGM_RAMEND
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.equ SDC_PORT_CSHIGH 6
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.equ SDC_PORT_CSLOW 5
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.equ SDC_PORT_SPI 4
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.inc "sdc.asm"
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init:
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di
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; setup stack
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ld hl, RAMEND
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ld sp, hl
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im 1
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call aciaInit
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call fsInit
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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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xor a
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ld de, BLOCKDEV_SEL
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call blkSel
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ei
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jp shellLoop
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; *** blkdev 2: file handle 0 ***
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blk2GetB:
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ld ix, FS_HANDLES
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jp fsGetB
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blk2PutB:
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ld ix, FS_HANDLES
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jp fsPutB
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