Search found 101 matches

by monsonite
28 Feb 2022, 13:01
Forum: Escape Meta Alt Control Shift
Topic: RCA 1802
Replies: 3
Views: 5198

Re: RCA 1802

Of all the classic 8-bit microprocessors from the mid-1970s, the RCA CDP1802 has to be one of the most intriguing. It began life over 50 years ago, in 1970-71 as a TTL "hobby computer" built in spare time by RCA Engineer Joseph Weisbecker. The TTL processor used approximately 100 TTL ICs i...
by monsonite
10 Feb 2022, 22:28
Forum: Escape Meta Alt Control Shift
Topic: That Addictive Word Game
Replies: 1
Views: 2118

That Addictive Word Game

Many of us will have come across Wordle, a very addictive word game where the objective is to reveal a disclosed 5 letter word in just 6 guesses. Whilst the game will run in a browser on a laptop or cell phone, I got thinking that it would be great to run it on the Gigatron. Earlier today I discover...
by monsonite
10 Nov 2021, 15:32
Forum: Hardware and software hacking
Topic: MINT - a minimal interpreted language
Replies: 3
Views: 1773

Re: MINT - a minimal interpreted language

Yes, a bytecode language, with a similar ethos to CHIP 8, packaged into 1K bytes of memory. The symbols chosen to represent the instructions are all chosen to have mnemonic value, so that the source code is human readable text. It shares a lot in common with Forth, but lacks the dictionary, and the ...
by monsonite
09 Nov 2021, 14:32
Forum: Hardware and software hacking
Topic: MINT - a minimal interpreted language
Replies: 3
Views: 1773

Re: MINT - a minimal interpreted language

More details of MINT are on my Github repository:

https://github.com/monsonite/MINT
by monsonite
09 Nov 2021, 14:16
Forum: Hardware and software hacking
Topic: MINT - a minimal interpreted language
Replies: 3
Views: 1773

MINT - a minimal interpreted language

Back in the mid 1970s when early home computers were very limited on memory, there were a number of attempts to create high level languages, that would fit within the tiny available memory space. Tiny BASIC is probably the best known of these and indeed it was one of the first interpreted languages ...
by monsonite
30 Aug 2021, 10:08
Forum: Kit assembly gallery
Topic: Gigatron in Shepparton Australia and detailed build info
Replies: 6
Views: 6092

Re: Gigatron in Shepparton Australia and detailed build info

Good work - glad you got it working.

Thanks for putting together the list of links and advice for new users. It is important that all this information can be easily located and accessed by newcomers.
by monsonite
16 Aug 2021, 11:51
Forum: Hardware and software hacking
Topic: A Gigatron Simulator for Learning Digital Logic.
Replies: 4
Views: 3449

Re: A Gigatron Simulator for Learning Digital Logic.

Hi Hans,

I have added the two files 62256.dig and 27C1024.dig to the repository.

https://github.com/monsonite/Gigatron-Simulator

If you paste these files into the library - something like:

\Digital\examples\lib\DIL Chips\EPROMs
l\Digital\examples\lib\DIL Chips\RAMs

They should then be available.
by monsonite
03 Aug 2021, 12:29
Forum: Hardware and software hacking
Topic: A Gigatron Simulator for Learning Digital Logic.
Replies: 4
Views: 3449

A Gigatron Simulator for Learning Digital Logic.

Hi All, I have recently created a simulator of the Gigatron circuit, using H. Neeman's Digital Simulator - which is available on Github. This simulator allows you to animate the TTL circuit and monitor the various signals as they switch. It allows you to single step through the instructions and watc...
by monsonite
13 Jun 2021, 11:13
Forum: Hardware and software hacking
Topic: 10MHz, 12.5MHz and Beyond!
Replies: 45
Views: 54333

Re: 10MHz, 12.5MHz and Beyond!

Walter, Marcel and I collaborated over the high speed version. I supplied the RAM on its adaptor pcb, the blank ROM and all of the 74F series ICs that were still available - in particular the 74F283 adders and 74F153 multiplexers to speed up the ALU. The counters in the Program Counter, X-reg and th...
by monsonite
05 Jun 2021, 11:12
Forum: Hardware and software hacking
Topic: 10MHz, 12.5MHz and Beyond!
Replies: 45
Views: 54333

Re: 10MHz, 12.5MHz and Beyond!

Joe, I increased the clock frequency to 8MHz, just using the standard components, and I was still able to get a much compressed picture from my monitor. I increased the frequency to 10MHz and although the monitor would no longer sync to this, the Blinkenlights still flashed confirming that the machi...