37 lines
772 B
NASM
37 lines
772 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
|
|
RAMSTART .equ 0x8000
|
|
RAMEND .equ 0xffff
|
|
ACIA_CTL .equ 0x80 ; Control and status. RS off.
|
|
ACIA_IO .equ 0x81 ; Transmit. RS on.
|
|
|
|
jr init
|
|
|
|
; interrupt hook
|
|
.fill 0x38-$
|
|
jp aciaInt
|
|
|
|
init:
|
|
di
|
|
; setup stack
|
|
ld hl, RAMEND
|
|
ld sp, hl
|
|
im 1
|
|
call aciaInit
|
|
call shellInit
|
|
ei
|
|
jp shellLoop
|
|
|
|
#include "core.asm"
|
|
ACIA_RAMSTART .equ RAMSTART
|
|
#include "acia.asm"
|
|
.define STDIO_GETC call aciaGetC
|
|
.define STDIO_PUTC call aciaPutC
|
|
STDIO_RAMSTART .equ ACIA_RAMEND
|
|
#include "stdio.asm"
|
|
SHELL_RAMSTART .equ STDIO_RAMEND
|
|
.define SHELL_IO_GETC call aciaGetC
|
|
.define SHELL_IO_PUTC call aciaPutC
|
|
SHELL_EXTRA_CMD_COUNT .equ 0
|
|
#include "shell.asm"
|