zilog_z80a

ok, think it's done, now will take the bin and run into stella's debugger to understand in a more detailed way what's going on with carry and brach. cheers.

I'm asking my self the same, i have the same problem with this skipdraw routine, and can't understand how it works just for a few lines how's possible to write pointer content to GRP0 register if A register isn't transferred to Y regsiter as index? a little confused, even i saw this url: http://www.biglist.com/lists/stella/archives/200309/msg00059.html and there's a tay instruction before loading accumulator with pointer TAY LDA (ZERO_PAGE_PTR),y STA GRP0 BUMP...

mmm.... no sound with this bin files on z26 3.02.01 linux Ubuntu 17.04 this emulator just shows DPC VERSION 1 AND 2.... this files are version 3? i`m able to run them on linux stella emulator Linux 4.10.0-32-generic #36-Ubuntu SMP Tue Aug 8 12:10:06 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux cheers.

other GREAT BOOK!! http://www.goodreads.com/book/show/17166862-atari-2600-programming-for-newbies Atari 2600 Programming for Newbies by Andrew Davie

ty Nukey Shay, sometimes i can imagine things but when people like you teachs is realy great!! cos this puts my ideas in the "yeh my friend you are in the right way" ty very very much. cheers.

^you can alter COLUPF at any point within a scanline.^ HI, i`m newbie, can you pls show me a little code doing that? would be really really helpfull !! cheers! and ty pd: "learning asm "

Making Games for the Atari 2600 Steven Hugg Paperback: 258 pages Publisher: CreateSpace Independent Publishing Platform (December 22, 2016) Language: English ISBN-10: 1541021304 ISBN-13: 978-1541021303 https://www.amazon.com/Making-Games-Atari-2600-Steven/dp/1541021304

Hi Andrew, hope you are ok. have trillon of confusions sorry. here we go... sorry, but cannot understand the difference between using uninitialized segments, variable overlays and ¿subroutines? MySub1 SUBROUTINE lda #200 MySub2 SUBROUTINE ty and cheers

hi, I`m a little lost, trying to figure out how should I use overlays with uninitialized "seg.u var" variables. left an example(is it right?) ty in advance. example: SEG.U init_vars ORG $80 temp ds 10 Variable ds 1 SEG code ORG $F000 ldx #0 org temp Buffer ds 8 Vector ds 2 org temp NamePtr ds 2 WordVector ds 6 SEG