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https://github.com/hsoft/collapseos.git
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74 lines
1.3 KiB
NASM
74 lines
1.3 KiB
NASM
; 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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.equ RAMEND 0xddd0
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jp init
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.fill 0x66-$
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retn
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.inc "err.h"
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.inc "ascii.h"
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.inc "core.asm"
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.inc "str.asm"
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.inc "sms/kbd.asm"
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.equ KBD_RAMSTART RAMSTART
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.equ KBD_FETCHKC smskbdFetchKCB
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.inc "kbd.asm"
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.equ VDP_RAMSTART KBD_RAMEND
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.inc "sms/vdp.asm"
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.equ STDIO_RAMSTART VDP_RAMEND
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.equ STDIO_GETC kbdGetC
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.equ STDIO_PUTC vdpPutC
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.inc "stdio.asm"
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; *** BASIC ***
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; RAM space used in different routines for short term processing.
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.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
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.equ SCRATCHPAD STDIO_RAMEND
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.inc "lib/util.asm"
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.inc "lib/ari.asm"
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.inc "lib/parse.asm"
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.inc "lib/fmt.asm"
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.equ EXPR_PARSE parseLiteralOrVar
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.inc "lib/expr.asm"
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.inc "basic/util.asm"
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.inc "basic/parse.asm"
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.inc "basic/tok.asm"
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.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
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.inc "basic/var.asm"
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.equ BUF_RAMSTART VAR_RAMEND
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.inc "basic/buf.asm"
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.equ BAS_RAMSTART BUF_RAMEND
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.inc "basic/main.asm"
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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 basInit
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jp basStart
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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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