DASM compile error - unresolved symbol list FrameStart

[Joe Stella]

Hi guys, just taking some baby steps here, and ran into a compiler error. I've typed in Chester's example "Hello World" program (sorta), and am getting the above error during the compile. I don't know what the referenced part of the code is supposed to do, and I haven't been able to find any references here or on google.

 

Any suggestions are appreciated.

 

PROCESSOR 6502

INCLUDE "vcs.h"

INCLUDE "macro.h"

ORG $F000 ; Cart begins here

StartFrame:

lda #%00000010 ; Signbal VSYNC start by

sta VSYNC ; setting bit 1

REPEAT 3 ; last 3 sanlines

sta WSYNC ; (WSYNC = wait until

REPEND ; scanline is finished)

lda #0 ; Signal VSYNC end (and

sta VSYNC ; VBLANK start)

PreparePlayfield:

lda #$00

sta ENABL ; Disable ball

sta ENAM0 ; Disable missles

sta ENAM1

sta GRP0 ; Disable players

sta GRP1 ; (with a 0s - only shape)

REPEAT 37 ; VBLANK lasts 37 scanlines

sta WSYNC ; (useful for game logic)

REPEND

lda #0

sta VBLANK

Scanline:

cpx #174 ; Phrase over?

bcs ScanlineEnd; if so, skip

txa ; Y=X/2 (logic shift ->

lsr ; divides A by 2)

tay

lda Phrase,y ; label,Y = mem[label+Y]

sta PF1 ; PF1 = playfield (bits

; 4 to 11)

ScanlineEnd:

sta WSYNC ; Finish current scanline

inx ; X=line counter

cpx #191 ; last visible scanline?

bne Scanline ; unless so, repeat!

Overscan:

lda #$00000010 ; "turn off" beam again

sta VBLANK ; 30 scanlines of

REPEAT 30 ; overscan...

sta WSYNC

REPEND

jmp StartFrame ; ... and start it over

; infinity.

Phrase:

.BYTE %00000000

.BYTE %11111111

.BYTE %10000001

.BYTE %10000001

.BYTE %10000001

.BYTE %11111111

.BYTE %00000000

ORG $FFFA ; Located at the end

; of ROM (cart)

.WORD FrameStart ; NMI address

.WORD FrameStart ; BOOT address

.WORD FrameStart ; BRK address

END

the compiler output is:

C:\Users\User\Desktop\dasm-2.20.11\bin>dasm source.asm -ocart.bin -f3

--- Unresolved Symbol List

FrameStart 0000 ???? (R )

--- 1 Unresolved Symbol

Fatal assembly error: Source is not resolvable.

 

source.asm

[Tjoppen]

StartFrame, not FrameStart

[Joe Stella]

Thank you for the reply. I did try that, on a hunch, and the program finishes compiling, but Stella just displays a black background and no sprite output. Do you get a different result by chance?

[Joe Stella]

NVM guys, got it. Just needed to grab the complete github version. Didn't realize the slide version was so incomplete.

[francipam]

your code compiles clean if..

 

.WORD FrameStart ; NMI address
.WORD FrameStart ; BOOT address
.WORD FrameStart ; BRK address

 

use StartFrame and not FrameStart