Search found 159 matches

by walter
18 Aug 2020, 17:52
Forum: Hardware and software hacking
Topic: Ye Olde Gigatron and Gigatronski
Replies: 11
Views: 7216

Re: Ye Olde Gigatron and Gigatronski

I couldn't get it to work. The clock signal looked very bad on the oscilloscope. For Ye Olde Gigatron, it would be nice to use a 7404/74LS04. I even have a 74H04. But that's for when I find the time. I don't know what changed, but suddenly the system is a lot more stable. I had it running with Mande...
by walter
17 Aug 2020, 14:49
Forum: Hardware and software hacking
Topic: Ye Olde Gigatron and Gigatronski
Replies: 11
Views: 7216

Re: Ye Olde Gigatron and Gigatronski

Since I gave a talk about the Gigatron at Neuron hackerspace in Moscow, I wanted to make a Gigatron with old Soviet chips. Unfortunately, I did not get any from my new Russian friends :-) By the way, Pavel and others of Neuron Hackspace have a wonderful "Flipper Zero" kickstarter project. ...
by walter
14 Aug 2020, 16:44
Forum: Hardware and software hacking
Topic: Ye Olde Gigatron and Gigatronski
Replies: 11
Views: 7216

Re: Ye Olde Gigatron and Gigatronski

Thanks. I found some on ePay. I got a CET (Chino-Excel Technology) CE4069UB from 1987 and a modern NXP HEF4069UBP. Neither works.. The scope shows that it is oscillating, but the output voltage is very low. The propagation delay of these is about the same as the 74C04 according to the specification,...
by walter
13 Aug 2020, 10:49
Forum: Hardware and software hacking
Topic: Pluggy Reloaded
Replies: 149
Views: 107106

Re: Pluggy Reloaded

Fixed the permissions of Vyvvyan, also fixed norgate's permissions.
Older users apparently are missing some options.
by walter
09 Aug 2020, 09:05
Forum: Hardware and software hacking
Topic: Ye Olde Gigatron and Gigatronski
Replies: 11
Views: 7216

Ye Olde Gigatron and Gigatronski

Hi all, The Gigatron was designed to run with old TTL chips. The kits were supplied with modern, CMOS type chips, but the goal was to keep it TTL compatible. Marcel had already started sourcing some old TTL components, most notably an old 70ns SRAM. I've taken over that task, which has led to the cr...
by walter
29 Jul 2020, 17:11
Forum: Hardware and software hacking
Topic: Issue with building my own Pluppy McPlugface
Replies: 14
Views: 9189

Re: Issue with building my own Pluppy McPlugface

More info on compatibility: https://en.wikipedia.org/wiki/PS/2_port#Conversion_between_PS/2_and_USB So you can use: - USB keyboard that also supports PS/2 (probable pre-2010) with any USB-PS/2 converter - USB keyboard that does not support PS/2 in combination with an active converter (post-2010) Pas...
by walter
28 Jul 2020, 07:04
Forum: Hardware and software hacking
Topic: Issue with building my own Pluppy McPlugface
Replies: 14
Views: 9189

Re: Issue with building my own Pluppy McPlugface

Thanks for your debugging work! Good to hear everything is now working fine. For some earlier kits, the cable is not the best quality. All the later kits have 28 AWG USB cables that work perfectly (either white or black). USB keyboard *should* support PS/2, but not all work according to specificatio...
by walter
27 Jul 2020, 19:58
Forum: Hardware and software hacking
Topic: microtron
Replies: 42
Views: 24414

Re: microtron

The RAM based ALU gives me mixed feelings. From the perspective of making a computer that they might have had in the late 70's, they would think you insane for using expensive ram to do math by LUT. On the other hand, once again. so much potential for interesting hacking. In 1K we have 4 LUT tables...
by walter
23 Jul 2020, 18:53
Forum: Hardware and software hacking
Topic: microtron
Replies: 42
Views: 24414

Re: microtron

Hi Steve, You have interesting thoughts, and it is nice to see them presented in such a concise way. I'm proud that the Gigatron has inspired you, in the same way designs before the Gigatron inspired us. I like how you have taken the design goals of the Gigatron and applied them, again, to the Gigat...
by walter
22 Jul 2020, 18:40
Forum: Kit assembly gallery
Topic: My own PCB
Replies: 4
Views: 5877

Re: My own PCB

qwertyface wrote: 22 Jul 2020, 16:04 Didn't the eevBlog have red ones for the four-layer ones?
In de design phase, I believe you see some red stuff. But the 4L boards he made were green:

https://www.youtube.com/watch?v=crs_QLuUTyQ