Sinclair ZX80 / ZX81 / Z88 Forums

Hi, Interesting findings. Anyway, in Europe PAL-B/G is used and its colour subcarrier frequency is 4.43361875 MHz. In case of PAL-N, the colour subcarrier frequency is 3.58205625 MHz and a channel bandwidth of 6MHz. So, PAL-N spec is very close to the NTSC spec, and it might be a reason why Sinclair...

Good job and thanks for sharing

They look great and well done.

Thanks for sharing.

I think your TS2068 provides good colours for NTSC standard. Do not expect anything similar to PAL, in NTSC all colours are washed out.

There a solution, a mini board with PAL encoder like AD724 that could be connected to the edge connector. R, G, B & video signals are available there.

TS2068 PAL

Looks great and thank for sharing.

Working from home these days and sorting out unfinished project in mean time. Sticker to my Jupiter ACE replica's keyboard finally done.

The hi-res schematic attached in the ZIP file.

Regarding Mark's query, any European TC2048 has got a UHF modulator which works on Channel 36. Timex used at least two makes of them, ASTEC UM1233 and Gintek UM-236E-1.

Hi,

Your TC2048 looks nice and I like the bright and good looking keyboard.

Anyway, there could be an issue with the RF modulator if the composite output works fine. The most accurate schematic diagram of rev.5 attached.

No, they are not. It was not an open project. Please see SMR where superfo sells them. If can't find any, send me a PM, because I've got one spare PCB if you are interested.