Search found 76 matches

by monsonite
14 Nov 2020, 14:41
Forum: Escape Meta Alt Control Shift
Topic: Gigatrons and Education
Replies: 1
Views: 110

Gigatrons and Education

In this strange year of lockdowns and social distancing, many of us will have had some spare time on our hands. I chose to use this time as constructively as possible, and to advance my understanding of computer science, software and hardware design languages. After 35 years in industry as a hardwar...
by monsonite
13 Nov 2020, 15:58
Forum: Hardware and software hacking
Topic: 10MHz, 12.5MHz and Beyond!
Replies: 27
Views: 10802

Re: 10MHz, 12.5MHz and Beyond!

Sugarplum, The Gigatron as it stands, is a marvellous piece of minimalist TTL design, backed up with incredible software. We truly have Marcel to thank for his insight and vision. As a colour, games machine, it spends all of it's time pushing pixels at the VGA screen. Imagine what it could do if unb...
by monsonite
08 Oct 2020, 15:46
Forum: Kit assembly gallery
Topic: Finding parts?
Replies: 17
Views: 1799

Re: Finding parts?

I was waiting for someone to do a Gigatron on a purple board from Oshpark - very smart.

Roughly how much did they charge for the boards?
by monsonite
31 Aug 2020, 10:07
Forum: Hardware and software hacking
Topic: microtron
Replies: 42
Views: 7683

Re: microtron

Steve, Thanks for the reply. When I first saw the Roelh alu - I was concerned how the ADD function could be achieved from just multiplexers and XOR gates, but after some consideration, a full adder is essentially just two XOR gates and an AND or NAND to provide the final carry out. The problem with ...
by monsonite
30 Aug 2020, 16:54
Forum: Hardware and software hacking
Topic: 80 Column Mode and high speed serial?
Replies: 3
Views: 644

80 Column Mode and high speed serial?

Clearly the original vision for the Gigatron was a 80's retro-style machine with colour video and audio - capable of playing arcade style games. The TTL cpu and integrated video generation hardware was designed around the requirement of 1/4 VGA video generation at 2 bits per colour. What if we took ...
by monsonite
30 Aug 2020, 14:16
Forum: Hardware and software hacking
Topic: microtron
Replies: 42
Views: 7683

Re: microtron

Steve, Not sure how throwing away the full-adders helps at all. Remember that the Roelh design uses 7 ICs to make a 4-bit ALU. The Gigatron achieves an 8 bit ALU in 10 ICs. Moving to the 74xx151 8 input multiplexer may offer some reduction in package count. Remember that the Gigatron can also genera...
by monsonite
05 Jul 2020, 23:24
Forum: Hardware and software hacking
Topic: Overview of hard/software subprojects
Replies: 4
Views: 1449

Re: Overview of hard/software subprojects

Walter,

Thank you for summarising these various projects.

As the forum grows, the location of these projects must be a mystery to our new members.

Now we have a list of them all in the one place. - Perfect


Ken
by monsonite
27 May 2020, 09:31
Forum: Escape Meta Alt Control Shift
Topic: In memoriam Marcel
Replies: 18
Views: 5896

Re: In memoriam Marcel

Walter, This is deeply saddening news, and my sympathies go to his family and friends, and of course to the wider Gigatron community. I met Marcel last September at the Cambridge Computing Museum, and have never met such a charming, thoughtful and brilliant engineer. I have had a hardware career for...
by monsonite
15 Apr 2020, 12:33
Forum: Hardware and software hacking
Topic: Conway's Game of Life in Commodore BASIC
Replies: 1
Views: 2964

Conway's Game of Life in Commodore BASIC

As some will know John H Conway - who devised the game "Life" passed away on April 11th. As a tribute, some of our friends on the retrocomputing forum have recreated a version of Life in Commodore BASIC. https://retrocomputingforum.com/t/conways-life-in-basic/1153 I'm going to have a go at getting t...
by monsonite
03 Apr 2020, 21:41
Forum: Hardware and software hacking
Topic: Using a USB keyboard
Replies: 7
Views: 3747

Re: Using a USB keyboard

Hi Dave,

Are you perhaps using one of those USB digital voltage and current meters?

I bought one of them, and found that it dropped a lot of voltage - from 5V to 4.5V IIRC.

If it is in line with the Gigatron supply - try removing it.

That might be part of your problem.


Ken