Sinclair ZX80 / ZX81 / Z88 Forums

Hi Sascha2000, You read my mind--I actually did contact the seller and we agreed on an arrangement for him to mail the computer to me. So, yes,... I'm weak,.. and I bought it. :oops: Thanks for the info about the RAM pack not working. I'll try a Timex 1016 and see what results I get. It it doesn't w...

Hello Sascha, Thank-you very much for taking the time to give me the benefit of your input. The unit is apparently cosmetically quite good, with all manuals and cords included, (even a tape recorder thrown in), but without any RAM expansion. I imagine one of my Timex-Sinclair packs would work on it?...

I know very little about this computer--just what I've seen on the links in this thread. Someone in a neighboring city to me (1.5 hours away) is offering one for sale for $30 Canadian. (CAD are roughly the same as USD these days.) Is this something I should be jumping on? What are the advantages ove...

Thanks RetroTechie and PokeMon. Assuming this one works as expected, (I'm sure it will), I am serious about picking up 2 or 3 more whenever they're available. I have a small handful of ZX81's and Timex's,... 1K, 2K, 16K (with pack), 32K internal mod,... and a ZXpand. I've picked some up on eBay with...

Just discovered this thread. Wow Pokemon. I don't understand all the technical stuff, but see enough to know that I want one, or two,... no, five,... [okay calm down]. Ah but alas. I am on the wrong side of the Atlantic, where we use NTSC not PAL. Is this a show stopper, or do the different systems ...

I took a crack at this too. No luck. Back in the 80's I made a ZX81 "Scrubber-Dubber" from plans published in a magazine article. It reads a dubious tape, and cleans up and re-digitizes the waveform so that (1) a ZX81 can read it properly, and (2) you can drive a 2nd slave recorder to make a tape co...

Awesome. Thank-you Mark.

So not all gates are created equal,... an aspect to keep track of when I take the course from the back of a book of matches and become a computer designer.

Ian

Okay, this is kind of funky. The good news is it works now. But I don't understand why,... I checked my wiring, voltage to the chip, and inspected for shorts. Nothing found. So I started with the substitution of least resistance--swapping the actual gate chip, since the actual wiring was convenientl...

Sorry for the delay in responding. Yes indeed that's all very good advice. I wish I'd known you guys 30 years ago. But first, search the internet, or use a library if you have one to learn about some basic electronics. You do not need to read and understand all the maths and theory, just learn about...

I got back around to working on this part of "Dad's Sinclair stuff", and got the mod working on the TS1000. For the record, I had misinterpreted the instructions and thought that for the HRG8 option to be included, the resistor connection was to be the only thing attached to pin 27. You can see in t...