Denial

https://www.thingiverse.com/thing:4678324 You can 3d print one ! Build details here . https://forums.atariage.com/topic/226541-vic-20-power-supply-replacement/ or buy an adapter ! https://coolnovelties.co.uk/coolnovelties/commodore-c16-c64-c128-vic-20/295-vic-20-psu-2-pin-to-2-1mm-dc-socket-adapter-...

The reason the 555 version is superior is that it takes time to reset and avoids the reset,reset,,,reset possibility that you get from just a switch!

with a proper mechanicaly de-bounced switch this is not a problem.

There is a 3D printable replacement if you or somebody you know has a 3D printer .

https://www.stlfinder.com/model/commodo ... M/4099053/

Sorry , just read the 'Switch' bit , please ignore.

The MT8808 is a matrix array that emulates the keyboard precisely ( it connects rows to columns in exactly the same way a c64 keyboard would ) and should work absolutely fine . Using this method all the target computer sees is a matrix keyboard!!

The DIY keyboard adapter is now on my website.

https://www.levosretrocomputerprojects. ... rd-adapter

If anybody would like to take a look.

Allows the use of a PS/2 or 5 pin din AT keyboard on the commodore64 or VIC20.

Got some 90b6's coming from Ray Carlsen.

This is mainly to check what it does right that others do wrong.

comparing the outupts to a genuine pla , timings , glitches , everything i can to see the difference between the good and the bad.

Exactly the point i am getting to. First to test roms against an original PLA and then to test against a relible replacement like the 90B6. Hopefully we will find a few that people can use and weed out those that cannot be used while showing the reasons why!

I will have to get hold of him. Just wanted to include it as it is the one that started the thread.

Don't worry , i think i will leave it . I was just giving you a chance to sell a few.

On the other hand, I have a pile of M27C256B-90B6

They can be used for other things as well .

Thank you for the offer , but i will decline.

two resistors and a tansistor will make an inverter just need the eproms to go with it , how much for six and uk postage? PM might be better.

eslapion do you have any 90b6's left? i would like to purchase one to use for comparison with a PLA the same as the rest.

The new boards have arrived!

ZaxxDual is now out of prototype!!!

And i have just noticed that the High and Low bank on the 512k are the wrong way around. Will correct it and re upload.

banman wrote Just a quick question how do we sign in? Sorry that is not available yet! Still trying to get my head around joomla the site building software. Will update as i can. Pick from the list at the top left to see pages. Ordered some enig , green , zaxxdual pcb's from jlcpcb , they work out a...

Have not used it yet , been busy elsewhere.

Will post some pictures when i get a chance!

My website is now up and running!!!

http://www.levosretrocomputerprojects.co.uk/index.php