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https://github.com/hsoft/collapseos.git
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117 lines
1.9 KiB
NASM
117 lines
1.9 KiB
NASM
.equ RAMSTART 0x8000
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.equ RAMEND 0xbfff
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.equ PORT_INT_MASK 0x03
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.equ INT_MASK_ON 0x00
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.equ PORT_INT_TRIG 0x04
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.equ INT_TRIG_ON 0x00
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.equ PORT_BANKB 0x07
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jp boot
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.fill 0x18-$
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jp boot ; reboot
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.fill 0x38-$
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jp handleInterrupt
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.fill 0x53-$
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jp boot
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; 0x0056
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.db 0xFF, 0xA5, 0xFF
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.fill 0x64-$
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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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.equ FNT_WIDTH 3
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.equ FNT_HEIGHT 5
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.inc "fnt/mgm.asm"
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.equ LCD_RAMSTART RAMSTART
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.inc "ti/lcd.asm"
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.equ KBD_RAMSTART LCD_RAMEND
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.inc "ti/kbd.asm"
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.equ STDIO_RAMSTART KBD_RAMEND
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.equ STDIO_GETC kbdGetC
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.equ STDIO_PUTC lcdPutC
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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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.out BAS_RAMEND
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boot:
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di
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ld sp, RAMEND
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im 1
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; enable ON key interrupt
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in a, (PORT_INT_MASK)
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set INT_MASK_ON, a
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out (PORT_INT_MASK), a
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ld a, 0x80
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out (PORT_BANKB), a
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ei
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call lcdOff
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; sleep until we press ON
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halt
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main:
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; Fun fact: if I place this line just above basStart like I would
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; normally do, my TI-84+ refuses to validate the binary. But placed
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; here, validation works fine.
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call basInit
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call kbdInit
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call lcdInit
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xor a
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call lcdSetCol
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jp basStart
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handleInterrupt:
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di
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push af
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; did we push the ON button?
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in a, (PORT_INT_TRIG)
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bit INT_TRIG_ON, a
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jp z, .done ; no? we're done
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; yes? acknowledge and boot
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in a, (PORT_INT_MASK)
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res INT_MASK_ON, a ; acknowledge interrupt
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out (PORT_INT_MASK), a
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pop af
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ei
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jp main
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.done:
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pop af
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ei
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reti
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FNT_DATA:
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.bin "fnt/3x5.bin"
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