Kevin
@emalliab.bsky.social
Music, Software, Electronics, Maker, Art, Books, Kids. Geek, dad, engineer, blogger, musician. I only follow what I think I can keep up with and mostly here to follow not post.
He/Him
He/Him
Here is a custom PCB version of the 4-bit TD4 with the LED bling built-in.
emalliab.wordpress.com/2025/10/29/t...
makertube.net/w/beyW1XWnp4...
#TD4
emalliab.wordpress.com/2025/10/29/t...
makertube.net/w/beyW1XWnp4...
#TD4
October 29, 2025 at 10:16 PM
Here is a custom PCB version of the 4-bit TD4 with the LED bling built-in.
emalliab.wordpress.com/2025/10/29/t...
makertube.net/w/beyW1XWnp4...
#TD4
emalliab.wordpress.com/2025/10/29/t...
makertube.net/w/beyW1XWnp4...
#TD4
Reposted by Kevin
Yes, yes it is! Our fabulous logo was designed by Sydney Padua, who wrote The Thrilling Adventures of Lovelace and Babbage, a brilliant alt-history in which the Analytical Engine is finished and used for fighting crime.
www.penguin.co.uk/books/286982...
www.penguin.co.uk/books/286982...
The Thrilling Adventures of Lovelace and Babbage
Meet two of Victorian London's greatest geniuses... Ada Lovelace, daughter of Lord Byron: mathematician, gambler, and proto-programmer, whose writings contained the first ever appearance of general co...
www.penguin.co.uk
October 13, 2025 at 10:46 AM
Yes, yes it is! Our fabulous logo was designed by Sydney Padua, who wrote The Thrilling Adventures of Lovelace and Babbage, a brilliant alt-history in which the Analytical Engine is finished and used for fighting crime.
www.penguin.co.uk/books/286982...
www.penguin.co.uk/books/286982...
Now with added bling! Part 4 has some simple hardware mods that add LEDs in some useful places to help debugging.
emalliab.wordpress.com/2025/10/05/t...
#TD4
emalliab.wordpress.com/2025/10/05/t...
#TD4
October 5, 2025 at 10:51 AM
Now with added bling! Part 4 has some simple hardware mods that add LEDs in some useful places to help debugging.
emalliab.wordpress.com/2025/10/05/t...
#TD4
emalliab.wordpress.com/2025/10/05/t...
#TD4
And now with some notes on programming and some example programs.
BTW - Anyone think of a way to multiply two numbers given only two registers and no other storage...?
emalliab.wordpress.com/2025/10/01/t...
#TD4
BTW - Anyone think of a way to multiply two numbers given only two registers and no other storage...?
emalliab.wordpress.com/2025/10/01/t...
#TD4
TD4 4-bit DIY CPU – Part 3
Having now spent some time thinking about and building my TD4 4-bit CPU this has a look at some code that I can run on it. Part 1 – Introduction, Discussion and Analysis Part 2 – B…
emalliab.wordpress.com
October 1, 2025 at 9:35 PM
And now with some notes on programming and some example programs.
BTW - Anyone think of a way to multiply two numbers given only two registers and no other storage...?
emalliab.wordpress.com/2025/10/01/t...
#TD4
BTW - Anyone think of a way to multiply two numbers given only two registers and no other storage...?
emalliab.wordpress.com/2025/10/01/t...
#TD4
September 28, 2025 at 3:43 PM
Are you on Mastodon?
I've not found you over there so far, but can't help thinking you'd find a pretty good audience over there for this kind of thing...
I've not found you over there so far, but can't help thinking you'd find a pretty good audience over there for this kind of thing...
August 3, 2025 at 9:16 AM
Are you on Mastodon?
I've not found you over there so far, but can't help thinking you'd find a pretty good audience over there for this kind of thing...
I've not found you over there so far, but can't help thinking you'd find a pretty good audience over there for this kind of thing...
Wouldn't it be a great outcome if the world collectively finally recognised that sometimes we could do with a few more people simply dreaming :)
July 26, 2025 at 9:33 AM
Wouldn't it be a great outcome if the world collectively finally recognised that sometimes we could do with a few more people simply dreaming :)
In the data sheet I was reading I thought the data had a minimum pulse width of 500nS (plus setup/hold time) and an address latch 400ns?
That worked for me anyway? But I wasn't using A8/A9...
That worked for me anyway? But I wasn't using A8/A9...
July 18, 2025 at 7:41 AM
In the data sheet I was reading I thought the data had a minimum pulse width of 500nS (plus setup/hold time) and an address latch 400ns?
That worked for me anyway? But I wasn't using A8/A9...
That worked for me anyway? But I wasn't using A8/A9...
Some of the control line transitions have a minimum wait time - that caught me out. Are you sure you're meeting all the timing criteria?
Isn't all control pins high "latch address" so what is the following data access? That looks like a lot of data activity with no further control line updates?
Isn't all control pins high "latch address" so what is the following data access? That looks like a lot of data activity with no further control line updates?
July 17, 2025 at 6:18 PM
Some of the control line transitions have a minimum wait time - that caught me out. Are you sure you're meeting all the timing criteria?
Isn't all control pins high "latch address" so what is the following data access? That looks like a lot of data activity with no further control line updates?
Isn't all control pins high "latch address" so what is the following data access? That looks like a lot of data activity with no further control line updates?
Fascinating to hear how you (used to do|are doing) things - many thanks for bringing this to #RetroFest2025 today :)
June 1, 2025 at 4:22 PM
Fascinating to hear how you (used to do|are doing) things - many thanks for bringing this to #RetroFest2025 today :)
It was fun to see a Compumate. I don't think I've seen another one in the wild before!
#RetroFest2025
#RetroFest2025
June 1, 2025 at 4:19 PM
It was fun to see a Compumate. I don't think I've seen another one in the wild before!
#RetroFest2025
#RetroFest2025
Get in with that MS BASIC...
May 30, 2025 at 6:27 PM
Get in with that MS BASIC...
Reposted by Kevin
10/n
HUMANS are an Everything Technology. We need tools that we can use, not machines that will live our lives for us.
And not Agent software that burns forests and slimes rivers so someone can say they made a billion rather than a paltry twenty million.
HUMANS are an Everything Technology. We need tools that we can use, not machines that will live our lives for us.
And not Agent software that burns forests and slimes rivers so someone can say they made a billion rather than a paltry twenty million.
May 26, 2025 at 4:52 PM
10/n
HUMANS are an Everything Technology. We need tools that we can use, not machines that will live our lives for us.
And not Agent software that burns forests and slimes rivers so someone can say they made a billion rather than a paltry twenty million.
HUMANS are an Everything Technology. We need tools that we can use, not machines that will live our lives for us.
And not Agent software that burns forests and slimes rivers so someone can say they made a billion rather than a paltry twenty million.