mirror of
https://github.com/hsoft/collapseos.git
synced 2024-07-22 17:50:19 +10:00
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.
41 lines
702 B
NASM
41 lines
702 B
NASM
; classic RC2014 setup (8K ROM + 32K RAM) and a stock Serial I/O module
|
|
; The RAM module is selected on A15, so it has the range 0x8000-0xffff
|
|
.equ RAMSTART 0x8000
|
|
.equ RAMEND 0xffff
|
|
.equ ACIA_CTL 0x80 ; Control and status. RS off.
|
|
.equ ACIA_IO 0x81 ; Transmit. RS on.
|
|
|
|
jp init
|
|
|
|
; interrupt hook
|
|
.fill 0x38-$
|
|
jp aciaInt
|
|
|
|
.inc "err.h"
|
|
.inc "core.asm"
|
|
.inc "parse.asm"
|
|
.equ ACIA_RAMSTART RAMSTART
|
|
.inc "acia.asm"
|
|
|
|
.equ STDIO_RAMSTART ACIA_RAMEND
|
|
.equ STDIO_GETC aciaGetC
|
|
.equ STDIO_PUTC aciaPutC
|
|
.inc "stdio.asm"
|
|
|
|
.equ SHELL_RAMSTART STDIO_RAMEND
|
|
.equ SHELL_EXTRA_CMD_COUNT 0
|
|
.inc "shell.asm"
|
|
|
|
init:
|
|
di
|
|
; setup stack
|
|
ld hl, RAMEND
|
|
ld sp, hl
|
|
im 1
|
|
|
|
call aciaInit
|
|
call shellInit
|
|
ei
|
|
jp shellLoop
|
|
|