Search found 7 matches

by Floopy
Mon Dec 24, 2018 6:24 pm
Forum: SALES
Topic: A Gaggle of ZX81's for sale
Replies: 8
Views: 2281

Re: A Gaggle of ZX81's for sale

No power or accessories--tough sell. Somebody had aspirations of distributed-computing something or other, but with today's Arduino and Fruit Pi platforms, there are better ways. It would be nice to refurbish them all and sell them one-by-one, but collectors want the full package. Being on the Amer...
by Floopy
Sat Jul 21, 2018 5:26 am
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 1548

Re: Yet another repair

A bit of an update... I had some things get in the way and I never got time to come back to this. I haven't gotten a replacement ULA yet, I really want to, but budgeting is getting in the way. I cleaned it up a little and got the screw posts glue-welded back together (they had broken off). I found a...
by Floopy
Thu Jun 28, 2018 6:53 pm
Forum: SALES
Topic: ZX81 ULA
Replies: 65
Views: 13591

Re: ZX81 ULA

I was just looking for a replacement and it went by too fast. They are not overly expensive also!
by Floopy
Thu Jun 28, 2018 6:16 pm
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 1548

Re: Yet another repair

If the ULA is in a socket, the quickest way to fault find, is to swap it with a known good working ULA. Of course, this only helps if you have another one... Mark That part where you suggest to swap another ULA. About that, where do you even find another ULA, it's a custom chip. The CPU is not doin...
by Floopy
Thu Jun 28, 2018 5:46 am
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 1548

Re: Yet another repair

Hey Floopy. Welcome :-) Greetings Jens Thank you, I went back to measure and I can confirm that the pin 35 on the ULA is always high. 4.2V to be exact, no oscillation. I'm not very familiar with this kind of setup, does the ULA have to work to be able to create a clock? The current consumption is a...
by Floopy
Wed Jun 27, 2018 4:44 pm
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 1548

Re: Yet another repair

Tha's what I was thinking at first. I'll try to measure again tonight and see what I come up with.
by Floopy
Wed Jun 27, 2018 4:19 pm
Forum: Hardware
Topic: Yet another repair
Replies: 18
Views: 1548

Yet another repair

Hello, my name is Floopy. I'm brand new here, but I've been playing with old hardware for quit some time. I was recently given a TS1000. I hate the keyboard, but the computer is restoration worthy. Anyway, when I power it up all I get is a black screen and occasionally a brief white line. My first s...