Sinclair ZX80 / ZX81 / Z88 Forums

If I can program mine, Id be happy to do others.

I've downloaded a program for developing the CPLDs, no idea if it is the correct one or not. Suppose I'll know when I get the board finished.

Has anyone built this board yet? I half way through and waiting for the remained or the components to arrive. McKloud mentioned some problems with the keyboard/diodes and a possible problem with the speaker damaging the transistor. Any other issues encountered? I have an Altera Max programmer, what ...

Paul & Charlie

Sorry, I only ordered two as I hadn't heard from anyone and I wasn't sure if Id have time tomorrow.

Drop a line to Dan, he replies quickly and its an easy purchase.

Dave

European guys, is there enough interest to buy the rest of Dans boards? I'm happy to front the cash and We could sort out distribution and costs when they get here? Update, I've been speaking to Dan as the link wasn't working for me. Result is I have bought 2 boards. Postage to UK is a very reasona...

Hi Charlie, yes - Im happy with that. I would like two of them.

Id be i8nterested in two boards if they are still available.

I followed the link below but the Buy Now button just took me to my Paypal account. Could you advise of total cost inc. shipping to the UK?

Can be purchased here via PayPal:

http://dlmeng.suncup.net/zx81-ts1000-rom-adapter-pcb/

Dave

Same here, iPad wont install it because its IOS10. Would love to get this on mine.

Hi, I've found a 4.7K resistor array at work and will put it in the board tonight and try the trick with ROM P2. If nothing happens, I'll get some photos taken of each side and send of the PCB them to you. Your offer to look at them is really appreciated, I just wanted to try and fix it myself first...

Hello Karl I've desoldered the R1 array. Checked what was sent to me as a 4.7K array only to find its a 10K. Got some ordered but it will probably be Monday before it arrives. I've replaced that big inductor with the same one that's in the build document. You said to connect pin 2, but to where? I g...

Hi Karl,

I may have found the problem. Resistor Array 1 is a 10K array instead 4.7K Do you think this would cause the problems? I cant do anything tonight but I'll try to get it swapped out tomorrow.

Dave