Search found 20 matches

by levoman
Thu May 05, 2022 2:07 pm
Forum: Hardware
Topic: 250425 Board repair/One Flash on dead test
Replies: 7
Views: 75

Re: 250425 Board repair/One Flash on dead test

Glad to hear it!!
by levoman
Tue May 03, 2022 9:54 am
Forum: Hardware
Topic: 250425 Board repair/One Flash on dead test
Replies: 7
Views: 75

Re: 250425 Board repair/One Flash on dead test

I am assuming that you have swapped the ram chips around to see if the error follows either u12 or u23 and have checked for data bus shorts to ground with a multimeter? The results you are getting would indicate to me either a ground short on D4 ( u23 data ) or more likely a short between D1 and D4 ...
by levoman
Sun Feb 06, 2022 11:32 am
Forum: Hardware
Topic: c64 keyboard that's really a Vic 20 keyboard problem
Replies: 5
Views: 201

Re: c64 keyboard that's really a Vic 20 keyboard problem

The vic20 and C64 keyboards are exactly the same pinout .
I know this from my keyboard project on here!

viewtopic.php?t=15160
by levoman
Mon Jan 24, 2022 7:48 pm
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

sorry m8 that link is five years old , most usb now will not work.
by levoman
Mon Jan 24, 2022 10:30 am
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

Just for the people who are interested the AE on the part no. is the designation for 28 pin dip and if it has a 1 on the end ( i.e. MT8808AE1 ) it is a 'lead free' part ( no Pb ) and , supposedly , better for the environment .
by levoman
Sun Jan 23, 2022 12:24 am
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

It might be worth asking mouser as they do not appear in the catalogue but i can get a page up with the MT8808AE1 that shows 17 in stock. https://www.mouser.co.uk/ProductDetail/Microchip-Microsemi/MT8808AE1?qs=pU29NIZ4ZwDlQSPjr7ESlQ%3D%3D mouser sku is 494-MT8808AE1 and here is a list of suppliers w...
by levoman
Sat Jan 22, 2022 1:14 pm
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

That does not apply to modern usb keyboards , only the early one's that work with the USB to PS/2 adapter have the PS/2 protocol and will work. In the early days of USB they needed a way to be compatible with the PS/2 protocol as the majority of computers still had them , that is why they shipped th...
by levoman
Fri Jan 21, 2022 11:52 pm
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

The project is now on my website https://www.levosretrocomputerprojects.co.uk/index.php/c64/18-c64-vic20-pc-keyboard-adapter I have used this trick with the keyboard sockets , but i do not think it will work with the IC's especially with the 20 pin connector in the middle! If enough people want one ...
by levoman
Fri Jan 21, 2022 4:01 pm
Forum: Hardware
Topic: PS/2 keyboard adapter for VIC20 and C64
Replies: 30
Views: 1306

Re: PS/2 keyboard adapter for VIC20 and C64

I also , in all honesty , can't get all the equipment people might have and show every variation on it . The project has to be limited somewhere .

If enough people want a different version i will track a new pcb for it. Please leave a request on the forum if you would like something different.