Search found 78 matches

by veekoo
Today, 11:34
Forum: Kit assembly gallery
Topic: Another Gigatron TTL in Finland
Replies: 11
Views: 3050

Re: Another Gigatron TTL in Finland

New case for Gigatron TTL from acrylic
by veekoo
21 May 2022, 17:56
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

I don't know why the blinkenlights end up different state when all the cables are attached and when not. Power LED is always on. I usually power off the unit when attaching the cables. Needs more investigating later on.
by veekoo
21 May 2022, 12:07
Forum: Hardware and software hacking
Topic: LCC for the Gigatron. Take two.
Replies: 47
Views: 9903

Re: LCC for the Gigatron. Take two.

Great contribution to Gigatron TTL society to make this GLCC available! Floating point mentioned. MIght my fractals with floating point calculation get any faster?
by veekoo
21 May 2022, 11:38
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

To make testing faster so far I borrowed chips from working Gigatron TTL. I think I will make sure my working example stays intact. I will have to wait for while to Inverters, Serial and ROM chips to arrive in post. Troubleshooting spreadsheet will most likely show faults. Other thing is how to fix ...
by veekoo
20 May 2022, 11:44
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

Soldered U26 directly to PCB. Still no function.
by veekoo
20 May 2022, 10:20
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

I found the faulty IC socket I was talking about. There is actual faulty IC socket U26.
by veekoo
20 May 2022, 05:59
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

Good concerns all. - To make sure RAM mod is not the issue, I tired it with 32K - Diodes are checked. The solderings are seen below board. - R18 is jumpered beneath - ROM chip is from working machine Maybe the fault is visible with high MHz. Bad connection or something. I will check the oscillator c...
by veekoo
19 May 2022, 16:30
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Re: Non-working project - help needed

IC sockets in my project are very tight and I have ruined some ICs with bent legs. Then there have been all sorts of short circuits in some ICs destroying them. That was the case with U37 and couple of other ICs. The lead free tin also is troublesome too much temp for PCB and components. Also I grad...
by veekoo
19 May 2022, 11:35
Forum: Support
Topic: Non-working project - help needed
Replies: 13
Views: 197

Non-working project - help needed

I have had long time a non-working gigatron ttl. It had damaged PCB at blinkenloghts D5 and VSYNC R18 places. I now tried to correct this with jumper cables and it most likely worked. There was also a faulty IC which I replaced. Rest of ICs were tested OK. RAM64K mod is installed. I get power ON led...
by veekoo
12 May 2022, 06:51
Forum: Kit assembly gallery
Topic: Another Gigatron TTL in Finland
Replies: 11
Views: 3050

Re: Another Gigatron TTL in Finland

The non-working project. I have put good effort try to fix this, but no function yet. Last try will be use troubleshooting.xlsx to find where faults occur.