Some experiments with finding intersections between triangles.

Triangle fill ported from the driver for my RC2014 VDU. Now to sort out the drawing order.

@breakintoprogram.co.uk What techniques did you use for hidden surface removal in your Next 3D library ?

I finally remembered how to do rotations properly :-)

Not for the first time, rotations in 3D space are "doing my head in"

A bit of 3D fun with github.com/recp/cglm

The rose seeds that have been in my fridge all winter have started to germinate :-)

@pimoroni.com I've been working on a C API for the Tufty2350 display, and the basics are now working :-)

I might have to get one of these ! shop.pimoroni.com/products/ada...

I'm in unfamiliar territory today. I'm developing a C wrapper for the Pimoroni C++ libraries for the Tufty2350. So far I have some "proof of concept" code running on a PICO2 which calls a C++ class constructor from a C programme.

Today's Start Trek Academy, Wow, just wow.... :-)

Spring is in the air here, so I've been out doing some gardening, well mostly pruning, trimming, dead heading and weeding.

Does anyone have recommendations for C/C++ extension to install in VScodium ?

Tools installed for building C code for my Tufty :-)

Today I have mostly been watching NCIS Origins Season 1.

I just watched the first episode of Starfleet Academy, and as a Lower Decks fan this caught my eye !

This took much longer than it should have done to get right, even with two sets of eyes on it :-) : XOR BDUP BROT BDUP BROT NOT AND BROT BROT NOT AND OR B. :,

Another old school development technique that I still use are "railroad diagrams". I generate them using this tool github.com/tabatkins/ra...

It's taken a while, but I've finally got a version of the classic "Lunar Lander" game written in my new "FORTH-like" language running on the Elliott 803.

Today I Learned (well I expected it anyway) that Google's AI sucks at writing code in Forth ! It didn't even manage to print what it said was the expected result 😆

This is a major mile stone for my new Forth-like language for the Elliott 803 :-)

I do wish organisations would stop send emails that say "See our web site for more details" when the email was just a copy of the information on their web site ? It's not very helpful :-(

Having added RECURSE I can now do this in 39th: : FACTORIAL DUP 2 LESS IF DROP 1 EXIT THEN DUP 1 - RECURSE * :, 15 1 DO I . I FACTORIAL . CR LOOP You can see the call and data stacks growing and shrinking on the memory display.

Make one of your New Year's Resolutions to visit The National Museum of Computing in 2026 :-)

I showed one of the other TNMOC volunteers how to use the 803's ALGOL plotter package. :-)

I'm giving the Elliott 803's battery its annual discharge/charge cycles while the museum is closed over Christmas. This shows the second discharge cycle underway with cells 1-10 on load. Each cell has a 1Ω resistor across which I remove when the cell is "flat".

Added some more words to my FORTH like language for the 803. Saw this so had to try it.... 3 DIGITS : SPACES DUP 0 = IF DROP ELSE 0 DO 28 EMIT LOOP THEN :, : PASCAL CR DUP 0 DO 1 OVER 1 - I - 2 * SPACES I 1 + 0 DO DUP . J I - * I 1 + / LOOP CR DROP LOOP DROP :,

Time to give the Elliott 803's battery it's annual discharge/recharge cycle. It spends all year "floating" across the -27.5V DC supply to the 803, so cycling it does it good esp. as it is a NiCd.

Very frustrating day trying to get a bit of code that I'm sure was working only a couple of days ago to work again. Gave up at 22:00, started from scratch with a new flow chart, and now (00:10) it is working again ! Sigh.

I keep apples in the fridge, which means that sometimes they germinate ! I've put a few seeds in this tray and the first one poked out today :-)

A bit of seasonal output from the Elliott 803 (on my 3D emulation).

🌅Happy Winter Solstice🌇

My FORTH like language for the ELLIOTT 803 running on my 803 emulator.

39th is my FORTH like language for the Elliott 803 and it has got to the point where it can run this code : 5 DIGITS : HAIL DUP ODD IF 3 * 1 + ELSE HALF THEN :, 100 35 0 DO DUP DUP . ODD IF .' ODD' ELSE .' EVEN' THEN HAIL CR LOOP

For me drawing a flow chart brings clarity and leads to a simple implementation. :-)

My FORTH like language for the ELLIOTT 803 has got to the point where it can run simple programs. If you know FORTH you should be able to work out what this does: VAR X 13 1 DO I X £ 13 1 DO I X @ * . LOOP CR LOOP

Jump on a train and pop up to Bletchley Park - lots to see including @tnmoc.bsky.social RSGB radio stuff and the Bletchley Park Museum. Time it right and you’ll meet @peteronion.bsky.social and his amazing Elliott computer. It’s about an hour by train. If you do go, let people on hear know!

Just realised I've been retired for 10 years (as of last Monday) 😀

Nothing like starting the day with a bit of ALGOL-60 :-)

DJT "a permanent pause in..." Someone buy him a dictionary !

If you know, you know :-) DEFINE(ENTER) 44 0+:30 IP 22 RETSP/20 0 02 W:40 1+ 20 IP/40 0 CLOSE DEFINE(EXIT) 44 0+:02 0 27 RETSP/04 1 20 IP/30 0 20 W/40 0 CLOSE

Hey Ford Dealers.. When you send out invites to your "Exclusive Ford Test Drive Event" (no doubt to all of your customers, so not very "exclusive") why don't you include a button for "I'm not interested, don't keep pestering me with repeated emails" ?

More keyboard cleaning today.

On a whim I decided this old HP keyboard needed a good clean. However I'm not going to show you the picture of what I found under the key tops when I started to remove them, just the picture of it now looking as good as new :-)

I've been running Debian 13 (Trixie) on one of my Pi5s for a few days and I've noticed some problems when running emacs. Occasional screen corruption with sections of text appearing in the wrong places. Installing emacs-pgtk seems so far🤞to have fixed it. emacs-pgtk is tailored to run on Wayland.

Well that's a giant leap forwards from where I got to last evening :-)

Today I will mostly be learning about z88dk and how to use it to build a better version of CamelForth for my Orton3CX.

Would you ever write "Downdate the counter" as a comment to a line of code that decrements a counter ?

A bit of fault finding on a RC2014 system for another local builder who couldn't get it to work. It turned out to be a couple of dry joints on the SIO board. It was running BASIC by the time I was finished :-)

I've had a fun evening debugging (someone else's) software with LEDs on output ports :-) All working now though :-)