Search found 7 matches

by Mr Tall
04 Apr 2024, 20:17
Forum: Support
Topic: Controller/Serial input problem
Replies: 5
Views: 313

Re: Controller/Serial input problem

Definitely agree. This second controller started misbehaving as well. I ended up building a little buffer with a spare 74HCT32 (quad OR gate, tied each gate's inputs together to improvise a buffer). I sent the clock and latch signals through that to the controller, and buffered the data line back th...
by Mr Tall
03 Mar 2024, 18:38
Forum: Kit assembly gallery
Topic: Hello! I made a Gigatron
Replies: 4
Views: 702

Re: Hello! I made a Gigatron

Received some "famiclone" controllers from AliExpress, and they *sort of* work. The Gigatron recognises input from these, but causes one of my monitors to go black when it's plugged in. Random unplugging/plugging back in can make it come back to life some of the time. So, an 74LS165 from e...
by Mr Tall
26 Feb 2024, 13:23
Forum: Support
Topic: Controller/Serial input problem
Replies: 5
Views: 313

Re: Controller/Serial input problem

Happy to report that it was the controller! Everything is working properly.
by Mr Tall
21 Feb 2024, 20:04
Forum: Kit assembly gallery
Topic: Hello! I made a Gigatron
Replies: 4
Views: 702

Re: Hello! I made a Gigatron

It's not potted, but it doesn't seem to have any markings. IMG_20240221_195501.jpg I do like the custom "SECECT" button though, not seen that before :) Thanks for the links - I've got some alternative controllers on the way from AliExpress, but I'll go dig through my bits box and see if I'...
by Mr Tall
21 Feb 2024, 18:02
Forum: Support
Topic: Controller/Serial input problem
Replies: 5
Views: 313

Re: Controller/Serial input problem

That's great, thank you for the information. It hadn't occurred to me that the scope might not be able to trigger! 160ns is a very short amount of time, and my scope is fairly old. I'll have another crack at it tonight and see if I can spot anything. All the chips are HC or HCT, there's no 74LS anyw...
by Mr Tall
20 Feb 2024, 21:48
Forum: Support
Topic: Controller/Serial input problem
Replies: 5
Views: 313

Controller/Serial input problem

Hi all, I've built a Gigatron, and the video and audio seems to be working fine: IMG_20240209_174156.jpg But, when I attach a controller (cheapy knock-off SNES controller wired to a 9-pin plug), the Gigatron acts like it's receiving lots of random inputs. Nothing I press makes any difference. I've p...
by Mr Tall
20 Feb 2024, 21:32
Forum: Kit assembly gallery
Topic: Hello! I made a Gigatron
Replies: 4
Views: 702

Hello! I made a Gigatron

This was made by ordering PCBs from JLPCB in China, and sourcing all the bits from Farnell, Mouser and Digikey: IMG_20240207_213438.jpg It works! IMG_20240209_174156.jpg Sort of. I've hacked up a knock-off SNES controller to the 9 pin port. The Gigatron just acts like lots of random inputs are being...