collapseos/recipes/sms/kbd/glue.asm
2019-07-20 12:42:55 -04:00

58 lines
948 B
NASM

; 8K of onboard RAM
.equ RAMSTART 0xc000
; Memory register at the end of RAM. Must not overwrite
.equ RAMEND 0xfdd0
jp init
.fill 0x66-$
retn
#include "err.h"
#include "core.asm"
#include "parse.asm"
#include "sms/kbd.asm"
.equ KBD_RAMSTART RAMSTART
.equ KBD_FETCHKC smskbdFetchKCA
#include "kbd.asm"
.equ VDP_RAMSTART KBD_RAMEND
#include "sms/vdp.asm"
.equ STDIO_RAMSTART VDP_RAMEND
#include "stdio.asm"
.equ SHELL_RAMSTART STDIO_RAMEND
.equ SHELL_EXTRA_CMD_COUNT 0
#include "shell.asm"
init:
di
im 1
ld sp, RAMEND
; Initialize the keyboard latch by "dummy reading" once. This ensures
; that the adapter knows it can fill its '164.
; Port B TH output, high
ld a, 0b11110111
out (0x3f), a
nop
; Port A/B reset
ld a, 0xff
out (0x3f), a
call kbdInit
call vdpInit
ld hl, kbdGetC
ld de, vdpPutC
call stdioInit
call shellInit
jp shellLoop
.fill 0x7ff0-$
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c