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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.
73 lines
1.2 KiB
NASM
73 lines
1.2 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 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
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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 MMAP_START 0xd000
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.inc "mmap.asm"
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.equ BLOCKDEV_RAMSTART ACIA_RAMEND
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.equ BLOCKDEV_COUNT 1
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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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.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 AT28W_RAMSTART STDIO_RAMEND
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.inc "at28w/main.asm"
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.equ SHELL_RAMSTART AT28W_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 5
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.inc "shell.asm"
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; Extra cmds
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.dw a28wCmd
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.dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
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.inc "blockdev_cmds.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 shellInit
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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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a28wCmd:
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.db "a28w", 0b011, 0b001, 0
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ld a, (hl)
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ld (AT28W_MAXBYTES), a
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inc hl
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ld a, (hl)
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ld (AT28W_MAXBYTES+1), a
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jp at28wInner
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