One nice thing about those 6522 chips is that you can still buy them brand new on Mouser.com. Here's the 5V 40-pin version for under $7 for one unit. As far as I know they're compatible replacements, but I haven't bought one personally: www.mouser.com/ProductDetail/Western-Design-Center-WDC/W65C22N6TPG-14?qs=sGAEpiMZZMsYdxaYtmOicSRUuPiX8JOOAWyKaG%252be%2fco%3d And here's the version that can run at 1.8V to 5V, if you needed something to run at a lower voltage for some reason (same price). www.mouser.com/ProductDetail/Western-Design-Center-WDC/W65C22S6TPG-14?qs=sGAEpiMZZMsYdxaYtmOicSRUuPiX8JOOuiALCRL8d6k%3d
Hi 00Skyfox! Yes, WDC still makes some compatible ICs like the 65C22. I've never tried one myself since I still have a few spares, but surely I'll try a WDC replacement as soon as I run out of spares.
WDC also makes a 6502 processor that I assume is a compatible replacement for the 6502 in the 1541 and the VIC 20. Unfortunately they don't make a 6510 or 6526. Also, Signetics and a couple other companies made PLA substitutes, but I don't know if they can be used right from the factory, or if they have to be pre-programmed like an FPGA.
Hi again! Yes they make also a 6502 replacement, but also in this case, I did never try one. 6502 were made from a multitude of different second sources until some years ago so are still easy to find. As for PLA, they were programmable logic (82S100, PLS100, maybe others compatible) that originally CBM used to "condense" some glue logic on various platforms (CBM-II, C64, 264 series, etc.). Usually programmed 82S100 don't fail. But then CBM decided to make chips that had the same logic functions as the programmed PLAs, just they weren't programmable but fixed logic functions pin to pin compatible. Of course the MOS Technology chips had lower reliability and started to fail. I am working on a PLA replacement, so one day there will be a video on it :)
Thank you for helping me. I had the same problem with drive constantly running and both LEDs on. I swapped UB4 with a spare and it acts as it should! The Commodore recognizes it but wont load. Just shows garbage writing
Did you find out what the modification is for? The soldered wire...
at 05:33 you mean? It was likely an early PCB revision with last minute corrections.
One nice thing about those 6522 chips is that you can still buy them brand new on Mouser.com. Here's the 5V 40-pin version for under $7 for one unit. As far as I know they're compatible replacements, but I haven't bought one personally:
www.mouser.com/ProductDetail/Western-Design-Center-WDC/W65C22N6TPG-14?qs=sGAEpiMZZMsYdxaYtmOicSRUuPiX8JOOAWyKaG%252be%2fco%3d
And here's the version that can run at 1.8V to 5V, if you needed something to run at a lower voltage for some reason (same price).
www.mouser.com/ProductDetail/Western-Design-Center-WDC/W65C22S6TPG-14?qs=sGAEpiMZZMsYdxaYtmOicSRUuPiX8JOOuiALCRL8d6k%3d
Hi 00Skyfox! Yes, WDC still makes some compatible ICs like the 65C22. I've never tried one myself since I still have a few spares, but surely I'll try a WDC replacement as soon as I run out of spares.
WDC also makes a 6502 processor that I assume is a compatible replacement for the 6502 in the 1541 and the VIC 20. Unfortunately they don't make a 6510 or 6526. Also, Signetics and a couple other companies made PLA substitutes, but I don't know if they can be used right from the factory, or if they have to be pre-programmed like an FPGA.
Hi again! Yes they make also a 6502 replacement, but also in this case, I did never try one. 6502 were made from a multitude of different second sources until some years ago so are still easy to find. As for PLA, they were programmable logic (82S100, PLS100, maybe others compatible) that originally CBM used to "condense" some glue logic on various platforms (CBM-II, C64, 264 series, etc.). Usually programmed 82S100 don't fail. But then CBM decided to make chips that had the same logic functions as the programmed PLAs, just they weren't programmable but fixed logic functions pin to pin compatible. Of course the MOS Technology chips had lower reliability and started to fail. I am working on a PLA replacement, so one day there will be a video on it :)
Thank you for helping me. I had the same problem with drive constantly running and both LEDs on. I swapped UB4 with a spare and it acts as it should! The Commodore recognizes it but wont load. Just shows garbage writing