Search found 24 matches

by Ed in SoDak
Sun Aug 09, 2020 12:11 am
Forum: Hardware
Topic: No video output from my TS1500
Replies: 15
Views: 6621

Re: No video output from my TS1500

I bought this logic probe kit from Digikey a couple years ago. I added probes and it fits nicely in a plastic case that held 100 rounds of .22 cartridges, with room to store the probes inside the case. Seems to have most the bells and whistles mentioned above. Price has gone up a couple bucks, but s...
by Ed in SoDak
Tue Jul 28, 2020 9:08 am
Forum: Hardware
Topic: No video output from my TS1500
Replies: 15
Views: 6621

Re: No video output from my TS1500

Der, whoops. Before reading the replies here, I replied to the thread with pics you linked to above. The gist of my post was to try an external RAM pack, since the 1500 will remap internal memory and use the pack as primary "boot" RAM. Still no go, then you likely have problems unrelated to RAM. If ...
by Ed in SoDak
Tue Jul 28, 2020 8:40 am
Forum: Hardware
Topic: Photos of my TS1500
Replies: 3
Views: 1826

Re: Photos of my TS1500

I wonder if that's factory rework? Replacing that big ULA would not be for the faint of heart, though there's many who could pull it off. I'm not in that group, lol. Compared to the board in mine, it's not as clean as mine around the ULA. Mine does not have the flying lead on the underside, but that...
by Ed in SoDak
Mon Dec 09, 2019 8:36 am
Forum: Hardware
Topic: Resurrecting A ZX81, ZX Printer & Spectrum
Replies: 10
Views: 3816

Re: Resurrecting A ZX81, ZX Printer & Spectrum

My cheap flat screen tv acted the same way with my TS1000. It would sync for a second, then lose it and go blue screen as if it had no signal. If you don't have an old CRT TV, maybe you do have a VCR, you can try feeding the ZX through the VCR to your flat screen.
-Ed
by Ed in SoDak
Sun Dec 01, 2019 7:23 am
Forum: WANTED
Topic: Wanted: unused or scrap boards / PCBs
Replies: 2
Views: 9270

Re: Wanted: unused or scrap boards / PCBs

I have a 4x2.8" (~100x71) unused double-sided board from the 70's or 80's intended for a single 40-pin DIP, a couple dozen transistors plus other parts. Still shiny and showy on the component side. But I'm in the US. Is it even worth photographing and looking up shipping cost? May have been for a DA...
by Ed in SoDak
Sun Dec 01, 2019 5:43 am
Forum: SALES
Topic: Heritage for sale Timex, Lambda 8300, Printers, RAMS, and a lot more
Replies: 5
Views: 13040

Re: Heritage for sale Timex, Lambda 8300, Printers, RAMS, and a lot more

I hope you did well with your auctions. The Timex with the hacked TI99/4A keyboard is a treasure. Whoever made it spent a lot of time on the project, especially adding the keywords to the keycaps. My version is in my avatar. I made a crude case large enough to hold the motherboard and RAM, plenty of...
by Ed in SoDak
Sat Nov 30, 2019 5:57 am
Forum: GAMES
Topic: Frogger
Replies: 5
Views: 4423

Re: Frogger

Another way to boost low audio from a PC is to feed it into your cassette recorder's mic input. Record it to tape at the same time or put it on pause. Either way, send the earphone output to the ZX. There's adapters used to convert stereo headphone 1/8" plugs to mono, should work fine on the recorde...
by Ed in SoDak
Sun Jan 06, 2019 5:38 am
Forum: Sinclair Misc
Topic: How to Load a Program
Replies: 5
Views: 5298

Re: How to Load a Program

Yes, certainly! I see from Ian's post I must wire in a pair of Ruby Slippers. How could I have missed that? :shock:
-Ed
by Ed in SoDak
Sun Jan 06, 2019 5:17 am
Forum: Sinclair Misc
Topic: How bad was the wobble on the zx81
Replies: 19
Views: 13272

Re: How bad was the wobble on the zx81

Most everyone enjoyed cussed at the same quirks. My first quick answer was to solder the outer RAMpack terminals to the TS1000 connector. Later, I solved the poor loading, heat, RAM wobble and keyboard problems with a little hacker upgrade. A surplus TI99 keyboard in an open bottom plywood case with...
by Ed in SoDak
Sat Jan 05, 2019 8:04 pm
Forum: Sinclair Misc
Topic: How to Load a Program
Replies: 5
Views: 5298

Re: How to Load a Program

I built this loader circuit. Copy it exactly and you can't fail!
:mrgreen:
-Ed