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What is actually needed, is a connector that is designed to be a proper mechanical linkage. Card edge-connectors are actually intended to just be used for electrical connections in a card frame system, where PCB runners and other mechanical fixings are used. In such a system, card edge-connectors are much more reliable.
It was very frustrating, I made a little metal bracket that clamped the Sinclair Rampack to the main case - using the original screw holes. Helped a lot....
Hells teeth! I have a ton of those little "L" shaped brackets how come I never thought of this!!?brozier wrote: ↑Thu Nov 08, 2018 2:00 pmIt was very frustrating, I made a little metal bracket that clamped the Sinclair Rampack to the main case - using the original screw holes. Helped a lot....
1. Kept over heating and crashing
I learn not to use the ZX81 on a shag carpet. Once I put it on a desk or such, it was fine.
2. Moving the ZX81 with the 16K pack would cause a crash
When the ZX81 was picked up, the 16K pack was not secure enough to not move. It moved slightly which caused the top edge connectors to disengage from the ZX81 external connector.
My solution was to use duct tape to tape the ZX81 and the memory to a small piece of peg board. Now that both were secured to the board, I could pick up the ZX81 with no issue. The ZX81 and memory did not move in relation to each other. It was a big ugly, but very effective.
The TI keyboard required a lot of cut traces and added wires to adapt it to the Timex, but everything else was pretty simple soldering of a few wires connecting the switch, power jack and meter. I'd program in FAST mode and could enter lines as quick as I could type. It would run for hours without a single crash, even when moving it around a lot. Its beauty was in function, not looks!
Zx spectrum: masterpiece that keeps on giving
(wish it weren't so expensive)
If Timex had introduced only the Timex Sinclair 1500 first which had a "workable" keyboard, and 16K memory built onto board, it may have fared far better. People were so disappointed because of crashes and lack of keyboard that there was no word of mouth promotion.
I understand that the case design was sourced later from the Spectrum prototypes but this was no excuse for Sinclairing the American market. Remember the quality problems of other previous Sinclair products?
I think the speed of the US model was slower as well so game software is not as responsive.
I did not mind cassettes but I hated the wobbly rampack and the keyboard which was difficult to use. Pressing would cause the flexing which caused rampack to move and the subsequent crash.
Possibly the 1500 should have been sold with a cartridge adapter (built-in?) and one sample cassette and cartridge to promote simple operation but give the option of using a cassette.
Go back to 1993. Since then we have 1 MB RAM for the ZX81:
And with 628512 (512kx8) RAM chips on it you'll have 4 MB.
It is nice for fast animation with HRG screens and a diskcopy routine.