Who/what are you using for your chip source(s)?

What I can from my collection, all of which are old and most of which seem to work as expected. For the more specific parts, I did buy from ebay. Mistake I guess, but less than half the price was hard to resist. So far the only chip that seems to ...

It's been a while, nothing but problems with all my projects. Half the chips I bought don't work, the replica 1 video section is starting to get finicky, and my nvram circuit didn't work at all. Lots of fun.

In a desperate attempt to do something enjoyable again, I've started drawing up schematics ...

Not really knowing anything about it, what would happen if you left the toner on the traces, just scrubbing it off of the solder points and mistakes?

Hmmm.. one thing I notice in the Atmel data sheet's fine print under 4.6.1 Hardware Data Protection -- "holding any one of OE low, CE high, or WE high inhibits write cycles." Is that a useful clue? For example, are you holding OE low? I think most RAMs will accept a write with OE low, but evidently ...

Hi everyone,

I got the at28C64 chip yesterday, and built an eeprom programmer for the replica I. I'm having a bit of trouble burning the test program in, from the datasheet I was under the impression that it is both (mostly) pin compatible and electrically similar to a very slow SRAM. For that ...

I know this might be considered cheeky, but is the source code for this part available? I'm interested because I'm in the process of setting myself up for CPLD/FPGA dev and have some of these CPLDs on order. It would be great to learn how it works, and of course, to integrate one into my own ...

Alright, I didn't realize the cmos version was released that early. I might use it (definitely for the dma on the WDC chip), but it seems like the vast majority of code that I've played with is cross compatible. That's what sockets are great for ;)

Wow, that's really cool. Thanks for the link. I ...

I like what I see. sounds familiar, for nostalgia I play with the 6502 like you do. Simple, oldfashioned systems, just for fun to get something working.

You may find that not all 6502 forum users are setting their targets that low. Some will warn you not to use old NMOS 6502 and prefer the ...

You're welcome. My sister married a man named Dennis, and when they were courting, he would call the house and my dad would answer, and he would say, "Hello Mr. Wilson, this is Dennis!" I didn't think he was particularly a menace though.

Haha!


As you've seen on the primer, I don't use CAD for ...

Hi Garth (I was going to call you Mr. Wilson, but the connotation is a grumpy cartoon character, so maybe not :P ) Thanks for the welcome and read.

There have been far more than I can possibly recall. The book Apple I Replica Creation by Tom Owad, in combination with obelisk.demon gave me a basic ...

Hi everyone, I've been a lurker here for years and am constantly amazed by the quality of the information and advice freely given here. As a fellow enthusiast, thanks for keeping the 6502 so vibrantly alive.

I know the simple prototype blog is probably quite the cliche, and it seems like there are ...