Search found 101 matches
- 30 Aug 2020, 14:16
- Forum: Hardware and software hacking
- Topic: microtron
- Replies: 42
- Views: 27006
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...
- 05 Jul 2020, 23:24
- Forum: Hardware and software hacking
- Topic: Overview of hard/software subprojects
- Replies: 10
- Views: 14886
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
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
- 27 May 2020, 09:31
- Forum: Escape Meta Alt Control Shift
- Topic: In memoriam Marcel
- Replies: 19
- Views: 27445
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...
- 15 Apr 2020, 12:33
- Forum: Hardware and software hacking
- Topic: Conway's Game of Life in Commodore BASIC
- Replies: 1
- Views: 5461
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...
- 03 Apr 2020, 21:41
- Forum: Hardware and software hacking
- Topic: Using a USB keyboard
- Replies: 7
- Views: 7335
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
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
- 31 Mar 2020, 16:51
- Forum: Hardware and software hacking
- Topic: Alternative Languages
- Replies: 4
- Views: 4992
Alternative Languages
Hi All, I have started this new topic so that alternative languages may be discussed without deviating or diluting the superb content of some of the existing threads. Clearly there is some interest in Forth on this forum - which is excellent, bearing in mind that Chuck Moore was presented a Gigatron...
- 31 Mar 2020, 16:19
- Forum: Hardware and software hacking
- Topic: A Forth for Gigatron?
- Replies: 14
- Views: 16791
Re: A Forth for Gigatron?
Hi, I have been following Ulrich Hoffman and Andrew Read's work for a couple of years. There an interesting paper from the 2018 Euroforth conference that was held in Edinburgh http://www.complang.tuwien.ac.at/anton/euroforth/ef18/papers/hoffmann.pdf The Forth kernel is first dis-aggregated into two ...
- 03 Feb 2020, 01:20
- Forum: Kit assembly gallery
- Topic: Built Gigatron with IC sockets
- Replies: 6
- Views: 10224
Re: Built Gigatron with IC sockets
Hi ECL, I built mine up entirely using sockets too. Rather than glue, I would tack the socket in place by soldering two diagonally opposing pins. Unfortunately I had just one badly soldered joint - so on first power up, operation was intermittent - but with full visual inspection - easily solved. Th...
- 28 Dec 2019, 12:09
- Forum: Hardware and software hacking
- Topic: Modified Gigatron Design Ideas
- Replies: 57
- Views: 59938
Re: Opcode mods
Hi PurpleGirl, Using a ROM as the instruction decoder is an often used approach, but the problem is with the speed an instruction can be decoded. Fast ROMs are not very common these days and the AT27C1024 from Microchip/Atmel has an access time of 45nS. You might find that you could sample a batch o...
- 17 Nov 2019, 00:44
- Forum: Escape Meta Alt Control Shift
- Topic: Forth Day 2019
- Replies: 5
- Views: 6888
Re: Forth Day 2019
Thanks Everyone,
Its been a very enjoyable day - Chuck has just finished his "Fireside Chat" presentation.
I have put a pdf of my slides online at my github repository
https://github.com/monsonite/Forth-Day-2019
Best from Stanford,
Ken
Its been a very enjoyable day - Chuck has just finished his "Fireside Chat" presentation.
I have put a pdf of my slides online at my github repository
https://github.com/monsonite/Forth-Day-2019
Best from Stanford,
Ken