I have the dual circuit board variety. It may be a loose solder joint on the connector as the RAM pack works when first used but as it heats up it starts to falter (same with the screen glitch) so I will look to the connector first, and the ribbon connector between the two circuit board as well, to see if I see any dry solder joints and re-heat them.
I will also try the cap technique to get rid of interference once I've figured out what's wrong with the RAM pack.
You can get them for under $20 here in the US on eBay so I'll see how much time I will spend on debugging it...
The demo program below crapped out yesterday after printing two lines and now it ran through three full iterations (choice 3) and on the fourth one finally gave an error (C/140). Yesterday I first ran Elite and killed like 4 pirates before it started giving errors so it does requiring heating up before failure -- i.e. that seems to be consistent). The screen glitch occurred sooner, after going through the square pattern and starting at the spiral one. It's pretty warm today with 83 in my room so that might cause it to act up quickly.
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BTW, having finally figured out how to load programs from a wave file makes it much easier to use the TS1000. All I needed was a LCD TV that showed the loading pattern and luckily my cheap SuperSonic TV did. Still can't get programs from and old cassette loaded on EightyOne -- I have one, Battleship, that I wrote as a kid that almost got published by Gladstone right before Timex pulled the plug that I really want to get. The cassette itself looks brand new and has been kept in a dry cool place. Am looking on craigslist for a free cassette recorder so I can try with that. Sampling with audacity was just futile and I even tried to match to the output of wave files that EightyOne generates but those are so clean and digital it's hard to use as a starting point.
One final question, is it easy to upgrade the TS1000 internally to take 16K? Can you just plop in a 16K chip in place of the 2K or is there a limit? If so what chip should I be hunting for. Not having the RAM wobble would be nice plus, and I'm guessing, like the TS1500, you could then extend to 32K if needed.