Template
Upload hello world template
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### IntelliJ IDEA ###
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out/
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!**/src/main/**/out/
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!**/src/test/**/out/
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.kotlin
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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bin/
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!**/src/main/**/bin/
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!**/src/test/**/bin/
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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.idea/
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OUTPUT := example.bin
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TARGET_CPU := 65c02
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# Tool list
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CC65 := cc65
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CA65 := ca65
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LD65 := ld65
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CL65 := cl65
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# Searches directly under src and one level under. If a file is under 2 folders
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#such as src/math/float/types.s, either one more level needs to be added, or
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#switch these to a shell find $(shell find src -name '*.s')
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C_SOURCES := $(wildcard src/*.c) $(wildcard src/*/*.s)
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ASM_SOURCES := $(wildcard src/*.s) $(wildcard src/*/*.s)
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OBJECTS := $(ASM_SOURCES:.s=.o)
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.PHONY: all clean
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all: $(OUTPUT)
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$(OUTPUT): $(C_SOURCES) $(ASM_SOURCES)
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@mkdir -p $(dir $@)
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$(CL65) -t none --cpu $(TARGET_CPU) -C computer.cfg -O -o $@ $^
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clean:
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rm -f $(OBJECTS)
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rm -f $(OUTPUT)
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# 65C02 Assembly Project Template
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This template is based on the memory map for Mike42's computer/board. [Github](https://github.com/mike42/6502-computer/)
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# Physical Memory configuration
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MEMORY {
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ZP: start = $00, size = $0100, type = rw, file = "";
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RAM: start = $0100, size = $7e00, type = rw, file = "";
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PRG: start = $C000, size = $4000, type = ro, file = %O, fill = yes, fillval = $00;
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}
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# In-Code Segment separators
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp;
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BSS: load = RAM, type = bss;
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CODE: load = PRG, type = ro, start = $C000;
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VECTORS: load = PRG, type = ro, start = $FFFA;
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}
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; Serial port helper function
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; Serial is handled by the 65c51n (this thing has a few bugs)
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.export serial_setup
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.export serial_recv_char
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.export serial_print_char
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SERIAL_DATA = $8400
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SERIAL_STATUS = $8401
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SERIAL_COMMAND = $8402
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SERIAL_CONTROL = $8403
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serial_setup:
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; 65c51n has a few bugs. check http://forum.6502.org/viewtopic.php?f=4&t=2543&start=30#p29795
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lda #$00
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sta SERIAL_STATUS ; Write to the status register for program reset
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lda #$0b ; %0000 1011
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sta SERIAL_COMMAND ; || |||`- Data terminal ready (DTRB low)
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; || ||`-- IRQB disabled
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; || ``--- RTSB low, transmit interrupt disabled
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; |`------ Receiver normal mode
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; `------- Parity disabled
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lda #$1f ; %0001 1111
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sta SERIAL_CONTROL ; |||| ````- 19200 baud
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; |||`------ Receiver clock is baud rate
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; |``------- 8bit word
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; `--------- 1 stop bit
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rts
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serial_print_char:
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pha ; Save A to stack (character)
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lda SERIAL_STATUS ; read status register and ignore the value
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pla ; return character from stack
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sta SERIAL_DATA ; send character
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jsr serial_delay ; comment out for older 6551/65c51
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rts
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serial_recv_char:
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lda SERIAL_STATUS ; read status
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and #$08 ; mask receive status flag
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beq serial_recv_char; if buffer is empty, loop
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lda SERIAL_DATA ; get byte
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rts
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serial_delay:
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phy ; save y reg
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phx ; save x register
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ldy #6 ; delay value (clock rate in mhz 2 clock cycles)
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@ydelay:
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ldx #$68 ; Init x register
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@xdelay:
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dex ; decrement low index
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bne @xdelay ; loop back until x is 0
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dey ; decrement high
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bne @ydelay ; loop until y is 0
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@delay_done:
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plx ; return x
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ply ; return y
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rts
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; Addresses for the VIA 65c22
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VIA_PORTB = $8000
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VIA_PORTA = $8001
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VIA_DDRB = $8002
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VIA_DDRA = $8003
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VIA_T1C_L = $8004
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VIA_T1C_H = $8005
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VIA_T1L_L = $8006
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VIA_T1L_H = $8007
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VIA_T2C_L = $8008
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VIA_T2C_H = $8009
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VIA_SR = $800a
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VIA_ACR = $800b
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VIA_PCR = $800c
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VIA_IFR = $800d
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VIA_IER = $800e
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VIA_PORTA_2 = $800f
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+40
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.import serial_setup
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.import serial_print_char
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.segment "ZEROPAGE"
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; Zero-page variables ($0000 - $00ff)
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.segment "BSS"
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; RAM variables ($0100 - $7fff)
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.segment "CODE"
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; Actual program code ($c000 - $fff9)
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reset: ; Program starts here
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jsr serial_setup
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ldx #0
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hello_world_loop:
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lda str_hello_world,x ; get char
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beq hello_world_end ; IF char is 0, done
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jsr serial_print_char ; send char to console
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inx ; increment x (next char)
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jmp hello_world_loop
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hello_world_end:
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jmp hello_world_end
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irq: ; IRQ Handler
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rti ; Do nothing
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nmi: ; NMI handler
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rti ; Do nothing
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str_hello_world:
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.asciiz "Hello, World!"
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.segment "VECTORS"
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; NMI, RESET and IRQ vectors
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.word nmi
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.word reset
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.word irq
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