Search found 114 matches

by Roni
Tue Feb 24, 2009 8:33 pm
Forum: Newbie Help Center
Topic: i feel like such a wintard...
Replies: 1
Views: 1737

i feel like such a wintard...

What exactly am I to do with all the files in the folder I downloaded which is supposed to contain WLA-DX?
by Roni
Sat Feb 21, 2009 3:13 am
Forum: NESdev
Topic: indexing a constant (immediate)
Replies: 17
Views: 7456

i guess i also forgot that x could be an operand of ADC.


Celius knows what it's like to be zonked and still attempting to mentally process code ;)
by Roni
Fri Feb 20, 2009 7:24 pm
Forum: NESdev
Topic: indexing a constant (immediate)
Replies: 17
Views: 7456

i'm SORRY i'll think next time before asking a question that may be met with pedantic remarks about assembly fundamentals it's just that with all the addressing modes of the 6502, it's hard to remember exactly what's allowed. one might conclude that since when x=3, LDA $0303,x means LDA $0306, maybe...
by Roni
Fri Feb 20, 2009 7:02 pm
Forum: NESdev
Topic: indexing a constant (immediate)
Replies: 17
Views: 7456

ok i didn't state my question correctly.

and i suppose the point's moot because what i'm trying to do can be done easilywith a bit of thought

Code: Select all

lda value,x

=

txa
clc
adc value
by Roni
Fri Feb 20, 2009 5:59 pm
Forum: NESdev
Topic: indexing a constant (immediate)
Replies: 17
Views: 7456

well i guess as they say - ask a silly question...
by Roni
Fri Feb 20, 2009 5:52 pm
Forum: NESdev
Topic: indexing a constant (immediate)
Replies: 17
Views: 7456

indexing a constant (immediate)

silly question but...

why can't it be done in 6502
eg.

Code: Select all

lda #$00,x
or can it?
by Roni
Sat Jan 31, 2009 2:27 pm
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

the specs for the programmer i ordered says it supports 12V power mode so i guess as long as i have the correct input power supply it should work, right? http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=130279341492 http://img403.imageshack.us/img403/710/20090131781...
by Roni
Fri Jan 30, 2009 10:50 am
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

The "C" means that they are CMOS devices, devices without the "C" are old style NMOS devices. The important differences here are the speed and the power consumption. CMOS devices draw less power and tend to be faster. I've noticed that when using non-CMOS EPROMs in NES games, th...
by Roni
Fri Jan 30, 2009 7:32 am
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

it's all good, my options are constantly expanding as long as people keep throwing out 386's. I just scavenged two 27C256's from a video card and a 27C512 from a keyboard adapter on a motherboard whose service tag read 1992.
by Roni
Wed Jan 28, 2009 4:20 pm
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

also, is it possible to use a 8KB or smaller ROM as a PRG? iirc, all that's necessary is to tie certain address pins high or low, ok i forget. You can, but there are no commercial games that will fit -- the smallest is 16kB. You'll need to use two and some external logic. Address lines generally do...
by Roni
Wed Jan 28, 2009 3:38 pm
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

Note, however, that a 2764 is only 64kilobit, or 8kilobyte: It would take 3 or 5 to support the tiniest of NES games. They would be far more practical for making Atari 2600 repros. Or NROM CHR ROMs, if you can dumpster-dive a bunch of 27C128 or 27C256 parts to use for the PRG. thanks, Tepples. you ...
by Roni
Mon Jan 26, 2009 5:39 pm
Forum: NES Hardware and Flash Equipment
Topic: 2764 vs 27C64 EPROMS
Replies: 12
Views: 8161

2764 vs 27C64 EPROMS

i just found a motherlode of 2764's in a heap of old computers. can they be interchanged with 27C64's? if not then what differences should i know about?
by Roni
Tue Jan 13, 2009 6:33 pm
Forum: General Stuff
Topic: Willem.org : "caveat emptor"
Replies: 8
Views: 3596

It can program most memory chips like EPROM and Flash, and some microcontrollers. It didn't program the PIC I was using, so I had to get another programmer to use with MPLAB. And it can't burn any PLDs. If all you need is memory chips and maybe a microcontroller, it should be enough. for now i'm ok...
by Roni
Tue Jan 13, 2009 12:32 pm
Forum: General Stuff
Topic: Willem.org : "caveat emptor"
Replies: 8
Views: 3596

limitations? i thought you could program almost any IC with a willem :/
care to elaborate?
by Roni
Tue Jan 13, 2009 8:05 am
Forum: General Stuff
Topic: Willem.org : "caveat emptor"
Replies: 8
Views: 3596

Willem.org : "caveat emptor"

I'm in the market for an EPROM burner and as directed here, i went to www.willem.org and Sivava. Willem seems to be plastered with messages from angry customers that they never received their orders. And Sivava won't return my email questions about products and shipping. Any corroboration on whether...