2019-07-20 05:45:13 +10:00
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; 8K of onboard RAM
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.equ RAMSTART 0xc000
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; Memory register at the end of RAM. Must not overwrite
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2019-07-26 04:23:13 +10:00
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.equ RAMEND 0xddd0
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2019-07-20 05:45:13 +10:00
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jp init
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.fill 0x66-$
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retn
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2019-10-07 05:32:23 +11:00
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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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2019-07-20 05:45:13 +10:00
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|
2019-10-07 05:32:23 +11:00
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.inc "sms/kbd.asm"
|
2019-07-20 05:45:13 +10:00
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.equ KBD_RAMSTART RAMSTART
|
2019-07-26 04:23:13 +10:00
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.equ KBD_FETCHKC smskbdFetchKCB
|
2019-10-07 05:32:23 +11:00
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|
.inc "kbd.asm"
|
2019-07-20 05:45:13 +10:00
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.equ VDP_RAMSTART KBD_RAMEND
|
2019-10-07 05:32:23 +11:00
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|
.inc "sms/vdp.asm"
|
2019-07-20 05:45:13 +10:00
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.equ STDIO_RAMSTART VDP_RAMEND
|
2019-11-05 01:55:12 +11:00
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|
.equ STDIO_GETC kbdGetC
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|
.equ STDIO_PUTC vdpPutC
|
2019-10-07 05:32:23 +11:00
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|
|
.inc "stdio.asm"
|
2019-07-20 05:45:13 +10:00
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.equ SHELL_RAMSTART STDIO_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 0
|
2019-10-07 05:32:23 +11:00
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|
.inc "shell.asm"
|
2019-07-20 05:45:13 +10:00
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init:
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di
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im 1
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ld sp, RAMEND
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|
; Initialize the keyboard latch by "dummy reading" once. This ensures
|
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; that the adapter knows it can fill its '164.
|
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; Port B TH output, high
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|
ld a, 0b11110111
|
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|
out (0x3f), a
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|
nop
|
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|
; Port A/B reset
|
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|
ld a, 0xff
|
|
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|
out (0x3f), a
|
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|
call kbdInit
|
|
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|
call vdpInit
|
|
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|
|
call shellInit
|
|
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|
|
jp shellLoop
|
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|
|
.fill 0x7ff0-$
|
|
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|
|
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
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|
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|
