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Re: Tellab TL801

Posted: Fri Mar 08, 2019 3:48 pm
by nollkolltroll
neazoi wrote:
Mon Feb 25, 2019 11:12 am
Naked PCBs would be very fine, and useful if someone wants to take his chance to copy it. Just make sure they are good quality scans, these will be very valuable.
I guess you have seen Searle's NMI generator page?
I do not think your clone includes an nmi generator at all, the NMI requires 6 more chips or so. So your only chance with this would be the 8K rom in fast mode.
OK, here is a scan of the naked PCB @1200 DPI jpeg, but I think the post-processing would be quite extensive to make a copy of this. The bottom layer would be OK to copy, but the top layer also has printed text which messes with the track visibility. Also, LOTS of vias!

I've decided to build the kit, so I hope someone shouts quickly before I go too far if they want another scan :)

Re: Tellab TL801

Posted: Fri Mar 08, 2019 5:36 pm
by zx81jens
Well, you just reminded me to have a look at my TL801 :-)

You can coose between ZX80 or ZX81 Mode with a Jumper (Yellow)... the Jumper on the left side is to change the Backround (black on white or white on black). Without Jumpers the ZX80-Mode is on...



Re: Tellab TL801

Posted: Fri Mar 08, 2019 7:38 pm
by nollkolltroll
The PCB is surprisingly good quality. MUCH better than Sinclair :D