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View Full Version : Best source for replacement chips for VIC-1541 and 1571



meall
November 20th, 2016, 10:07 AM
Hi guys,

I got recently a few commodore disk drives that have some issues. I have a working 1541 (the one that probably came in the era of the C64, brown in color), a VIC-1541 (probably the VIC model) and a 1571 for C128. Of the 3, only the C64 version is working just fine.

For the VIC 1541 we were able to swap the 6522 chips from the working 1541 as they are selected, and it is clear that I need to replace at least one of them.

The 1571 is a bit trickier, as the chips are soldered and are 6522-2 (probably 2 Mhz versions) but when we investigated the behavoir from the VIC 1541 we thing the same chips are to blame. We also thing we should change the mn50005xca chips.

Is there someone selling these here? If not, where can I get them and decent price and shipping to Canada?

Thank you

taborj
November 21st, 2016, 11:53 AM
The 6522s are used in the VIC-20 as VIAs, so you may have some luck looking for VIC-20 bits. I've found those on eBay before, in a lot I bought of various chips (side note: I have two 6520s if anyone needs them, though I have no way to confirm they work; all the other chips from that lot worked, though).

In fact, I have a spare 6522 here (markings on it are R6522PE and R6522-20); I was kind of holding onto it in case one of the 6522s in my VIC-20 went out, but let me know if you can't find them anywhere else.

KC9UDX
November 21st, 2016, 02:31 PM
65c22 is in current production, if I'm not mistaken. It's 100% compatible with the 6522, uses less power, is rated 14MHz, but is known to run much faster.

I think Mouser stocks 65xx parts, or is it Digikey? Either way, they are readily available in Canada. Buy sockets when you buy chips.

The same goes for 6520/65c20/65c21.

meall
November 21st, 2016, 04:06 PM
65c22 is in current production, if I'm not mistaken. It's 100% compatible with the 6522, uses less power, is rated 14MHz, but is known to run much faster.

I think Mouser stocks 65xx parts, or is it Digikey? Either way, they are readily available in Canada. Buy sockets when you buy chips.

The same goes for 6520/65c20/65c21.

Yea, Mouser have them at ~$10 each...

Will this chip works also on the 1571? My friend was not sure if they were not clocked at the same speed (kinda 1 Mhz vs 2 Mhz).

The 65c22 is rated 14 Mhz as you said, I'm not sure if putting one with higher speed than the original have an impact. My friend is way better than me in electronics and I cannot say I have a clue on what these chips do :)

Dave Farquhar
November 26th, 2016, 02:55 PM
14 MHz chips will run at 1 or 2 MHz without any problem. You can run them slower than they're rated. Running them faster is a dicier proposition.

The drive will run a bit cooler and consume less power with newer chips.