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I don't think the clock is the issue here since his measurement was only around 0.2% "off" from the original 8.869MHz specification. Some years ago I made an expansion that had an external clock crystal. It was difficult to get the expansion to syncronize to the internal Vic-20 clock. The...

Great project! So nice to see that you got it working! I've had a similar plan with a 8050 drive. The PCB is so old and cracked that I have given up on it. But drawing a new PCB it certainly a daunting task.

I have seven Vic-20's and while most of them work, they are prone to failure after all this time. Since you were experiencing problems with two sound registers while the third one (partially) worked, I would suspect the VIC chip (6560) has gone bad. The display issue also indicates this...

I bought a 68060 in March from funkward-tech for $44. He actually sent it, but the tracking shows that it was returned to him sometime in May. Lots of emails and no item or refund, I tried to requesr a refund on ebay. They just closed it after some time due to «no activity». And that was like...

Much industrial equipment still use HART to communicate over 4-20mA signal lines. Although not a computer system bus, its used as a multi-drop communication bus, usually with MODBUS. HART is not very old (1980?), but the 4-20mA lines that its patched onto, are.

I bought a new 85MB external hard drive for my Amiga 500 in 1988. Had it shipped from the US to Norway (it was the only way to get one). It never worked. I could have made a fire of the 500USD instead. Would have been a quicker and less painful way to get rid of them. My best investment was my...

I did make an expander a few years back with a video output (in VGA though) for the Vic-20. it basically gave you the same 20(23) column screen as the VIC chip, but on a VGA screen. Everything was in Verilog code and output from a FPGA. It wasn’t compatible with the Data20, but tweaking it to do...

I have to admit I am still building my Apple-1. I started 3 or 4 years ago, so its not finished. But its close. The board is a Newton replica, first batch I think. I try to get all the original components, at least date correct. Obviously I haven’t managed to get the Torotel crystal, and still...

I can confirm this. I have several CBM disk drives, and they all have the 6530 RRIOT that has a small ROM inside. The ROM differs from version to version, and with all the different chips you are really not going to find a replacement soon. Your best option is therefore the replacement board...

Wow, thats an intersting find. My mother used to work as a journalist at a newspaper that had one of those. They are seriously heavy, so no wonder shipping exceed the price..

If you (or anyone else) ever try to repair the board, be aware that its only MCS6530-002 and MCS6530-003 that will work. Some ebay sellers seems to try to sell other 6530 variants (but they will not work). There is a 6530-variants list here: http://retro.hansotten.nl/6502-sbc/6530-6532/

There was a video posted on youtube a couple of weeks ago. The amount of stuff is just too large for anyone to go through it. It looks like a really large warehouse with no logistics whatsoever.

There is the ReAmiga3000 project here. I'm not sure if that includes the daughter board, but you can ask him.

Hi I am looking for a KIMSI expansion board for my KIM-1. It doesn't need to be in working condition.. in fact, it can be a bare board if it came from a kit. It looks like this: https://vintagecomputer.ca/the-kimsi-s-100-expansion-backplane-for-the-kim-1-by-forethought-technologies/

Just missed this: https://www.ebay.com/itm/284068242014?ul_noapp=true I have a B720 mainboard and a case. Since I have the mainboard with floppy board connectors, I am thinking of adding a couple of floppy drives to it. The control boards seems to be around, but what type of drive mechanism was...

Hi I am still looking for: CINCH 252 22 30 210 connector (44pin). Usually marked as 50 44S 30 1. They are green 44-pin connectors for inserting a PCB edge into them. They are green and have gold contacts and round gold base pins. Connectors with ears (for screws) are flooding ebay, but these...

In the main menu it says that Requests/Discussions has 141 treads, but going into here, there are only 2 showing? It looks like the other forum parts have the same problem as well.. I can't see my old postings for some reasons.

I will burn a GAL with the S80 option which is available for download (along with the U7 eprom that works with it). The 22A has a different mainboard than the 22, so I will make an adapter board like the one here:

Hi Does anyone know of a good electronics surplus store in the bay area? I am mostly looking for components, but old commodore computers are also interesting.

I am looking to program a few MMI 6301-1J for my Apple 1 clone. Alternately an Data I/O 29 with Unipak to program them myself.