Denial

I was dividing by 16
I'm only making myself look even more ridiculous.

Last time I checked, 2732 EPROMs were as rare as hen's teeth. I've been buying what I think are Chinese clones, like here: https://www.ebay.com/itm/172533017593 They have been working fine (time will tell). :D Ebay is literally flooded with these "new" ST EPROMS right now. What would you ...

Well this confirms that my adapters work , I may try building something that look nicer later.

The original VIC-20 character generator is a 2332 which uses 2 different independent chip select lines. Definitely the most complicated to replace and it usually requires an EPROM along with a logic gate. To top the cake, a C64 CG will not work on the VIC-20 because CS2 is active high on the C64, w...

I will try replacing the kernal and see if I get any issues. I'm just testing my adapters, this is only for testing purposes I have no reason to replace my character ROM at all.

So I finally got some time and patients to try this out, here are the details... I built the EPROM adapter so that I could try replacing ROMs inside my VIC-20. I found the wiring online and wiped out the soldering iron. After a few adapters had been made and some ROMs programed, I pop-ed open the ho...

Thank you this will come in handy.

Wow, I can't buy it, but still a cool cartridge to see.

Thanks,I bought some,

Do you have the maintenance manual? This site mentions a method with an alignment disk or commercially prepared. I guess that could be any bought software disk? http://sunfishdesigns.com/tcr/cbm/1541.html?i=1 That's what I'll end up doing since I don't own an alignment disk. I'm guessing the origin...

norm8332 wrote:I mean a loadstar or other disk without protection. I use a c64 to align the drives[/url]

The disk I is only as good as the drive it was made with, I only own one 1541 drive.

The 1541 Technical Reference Pg 19 explains the procedure for head adjustment (not that I've ever done it). I just noticed that I see that I need to hook the scope up on pin 9 on UC1(or UC2 I don't remember), and pin 7,8 UF3. Note that I have a "short" board. I have a few "factory&qu...

I have an oscilloscope, any solutions with that maybe?

norm8332 wrote:Here is a video that may help: https://www.youtube.com/watch?v=2KuWJVUDc5k

That's what I feared, I need a realignment disk. It's annoying to see how expensive they are.