mirror of https://github.com/stid/woz64.git
149 lines
4.3 KiB
NASM
149 lines
4.3 KiB
NASM
BasicUpstart2(start)
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#import "mem_map.asm"
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* = $8000 "Main"
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//------------------------------------------------------------------------------------
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.const MAIN_COLOR = $03
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.const BORDER_COLOR = $05
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.const CR = $0d
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.const BS = $14
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.const ADV_CHAR = '@'
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.const INIT_IRQ = $fda3
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.const INIT_MEM = $fd50
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.const INIT_IO = $fd15
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.const INIT_VID = $ff5b
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.const SCRN_CTRL = $d016
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.const RASTER_LINE = $d012
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.const INTERRUPT_CTRL = $dc0d
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.const NMSK_INTERRUPT_CTRL = $dd0d
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.const TIMER_A_CTRL = $DC0E
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//------------------------------------------------------------------------------------
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.word coldstart // coldstart vector
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.word start // start vector
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.byte $C3,$C2,$CD,'8','0' //..CBM80..
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//------------------------------------------------------------------------------------
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#import "screen.asm"
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#import "keyb2.asm"
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#import "shell.asm"
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//------------------------------------------------------------------------------------
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// Main Program
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//------------------------------------------------------------------------------------
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* = * "Kernel Start"
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coldstart:
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ldx #$FF
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sei
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txs
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cld
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stx SCRN_CTRL // Set Screen Bits
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jsr INIT_IRQ // Prepare IRQ
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jsr INIT_MEM // Init memory. Rewrite this routine to speed up boot process.
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jsr INIT_IO // Init I/O
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jsr INIT_VID // Init video
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cli
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* = * "App Start"
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//------------------------------------------------------------------------------------
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start:
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jsr initApp;
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print(lineString)
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print(testString)
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print(lineString)
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loop:
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lda #$FF
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Raster: cmp RASTER_LINE // Raster done?
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bne Raster
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jsr Keyboard2.ReadKeyb
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jsr Keyboard2.GetKey
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bcs loop
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cmp #CR
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beq execute
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cmp #BS
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beq backspace
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inputChar:
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jsr Shell.push // Char in Buffer
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cPrint()
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jmp loop
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backspace:
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jsr Shell.backspace
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cPrint()
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jmp loop
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execute:
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jsr Shell.push // CR in Buffer
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jsr Screen.screenNewLine
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jsr Shell.exec
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jsr Screen.screenNewLine
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jsr Shell.clear
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jmp loop
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//------------------------------------------------------------------------------------
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initApp: {
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sei
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lda #$7f
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sta INTERRUPT_CTRL // disable timer interrupts which can be generated by the two CIA chips
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sta NMSK_INTERRUPT_CTRL // the kernal uses such an interrupt to flash the cursor and scan the keyboard, so we better
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// stop it.
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lda INTERRUPT_CTRL // by reading this two registers we negate any pending CIA irqs.
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lda NMSK_INTERRUPT_CTRL // if we don't do this, a pending CIA irq might occur after we finish setting up our irq.
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// we don't want that to happen.
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// Disable 0e TIMER
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lda #254
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and TIMER_A_CTRL
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sta TIMER_A_CTRL
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ClearColorRam($00)
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ClearScreen(' ')
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SetBorderColor(BORDER_COLOR)
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SetBackgroundColor(MAIN_COLOR)
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jsr Screen.init
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jsr Keyboard2.init
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jsr Shell.init
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cli
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rts
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}
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//------------------------------------------------------------------------------------
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* = * "Hoax"
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hoax: {
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print(hoaxString)
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jmp loop
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}
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//------------------------------------------------------------------------------------
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* = * "Kernel Data"
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.encoding "screencode_mixed"
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version: .byte 00
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revision: .byte 01
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minor: .byte 05
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testString:
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.text "woz64 mon - v 0.1.5"
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.byte $8e, 0
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lineString:
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.text "----------------------------------------"
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.byte $8e, 0
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hoaxString:
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.text "=stid= 1972"
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.byte $8e, 0
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* = $9FFF "EpromFiller"
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.byte 0
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