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Knelf

@knelf.bsky.social
5 followers 13 following 41 posts

Dr Scruffy (aka Jonny), Digital Librarian, ex-artsy game developer and inline skater - looking for the exit. The exit to what is a whole other question,

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Knelf @knelf.bsky.social · 15/08/2026
So discovered that Arena 3000 at least on the BBC supported twin stick for single player. One for movement, the other for fire direction. game is on Elk and supports joystick. Probably 2 but I didn't check it yet.
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Knelf @knelf.bsky.social · 23/07/2026
That's really nice!!
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Knelf @knelf.bsky.social · 02/07/2026
I think I've (finally) finished my logic gate CPU... but have some improvement/stability ideas.... sigh...
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Knelf @knelf.bsky.social · 02/07/2026
So on my logic gate CPU. I was constrained to 16 instructions so CMP and LDI bit the dust alas. I've discovered I might be able to combine 2 other instructions though and maybe bring back one of these two.
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Knelf @knelf.bsky.social · 01/07/2026
Yay! Have just successfully run this on my simulated logic gate CPU on my phone, at a whopping 1Hz! Machine code on left, address middle, then assembly code, then comments.
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Knelf @knelf.bsky.social · 29/06/2026
oh nice! Taking it anywhere?
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Knelf @knelf.bsky.social · 29/06/2026
At least it arrived!!
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Knelf @knelf.bsky.social · 29/06/2026
Finished adding bank switching at the weekend so instructions 10 and 11, UBN and UMA should in theory now actually do something. Still needs proper testing though, although preliminary checks by manually setting/clearing corresponding registers looked encouraging.
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Knelf @knelf.bsky.social · 29/06/2026
Happily... the project is BACK ON! ^_^Y But here is the question... were there ever any "true" 2 player joystick games on the #AcornElectron? I remember er... Dogfight on the BBC Micro was fun for 2 players... is there an Elk version? any other games? Any that utilised analogue?
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Knelf @knelf.bsky.social · 29/06/2026
was one of my favourite shows!
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Knelf @knelf.bsky.social · 29/06/2026
It was great wasn't it! I went too. Loved it, although found the first ep somewhat high octane. Found the 2nd one much easier to follow along with
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Knelf @knelf.bsky.social · 08/06/2026
Doesn't surprise me in the slightest
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Knelf @knelf.bsky.social · 29/05/2026
Sadly... I probably won't have to any more X'(
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Knelf @knelf.bsky.social · 29/05/2026
A bit work in progress but I've been gradually building/simulating a Ben Eater CPU (from logic gates) on my phone for a while and finally got to the bit where I get to decide on the instruction set. It's still subject to change but was fun coming up with it. Hoping I won't miss a LDV instruction!
Plan for a CPU instruction set with control word and up to four microcode steps for each instruction, as well as logic notes and instruction explanations.
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Knelf @knelf.bsky.social · 29/05/2026
compared to the JMP and jump sub's but then realised one could just branch to a jump if one really wanted to go far! Doh!
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Knelf @knelf.bsky.social · 29/05/2026
Funnily enough I was thinking about this earlier reading the AEUG ROM section that needs a 3 byte jump instruction to the service routine. I was reading the 6502 instruction set the other day, looking for inspiration and the reality of the shorter jumps hit home. I was thinking, arrgh can't go far!
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Knelf @knelf.bsky.social · 14/05/2026
Noice!
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Knelf @knelf.bsky.social · 14/05/2026
I just tried it on Electroniq! Love it! Man I used to love Raptor in the nineties and this very much has that vibe! Nice speed too!
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Knelf @knelf.bsky.social · 14/05/2026
Can I ask a daft question? Why bne with a comment that it will always jump? isn't there an always jump command? Is it some sort of optimisation to use bne?
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Knelf @knelf.bsky.social · 14/05/2026
Not Alien9? ;)
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Knelf @knelf.bsky.social · 14/05/2026
I ah... may have to break out the old single 15-pin port, dual analogue joystick adaptor project...
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Knelf @knelf.bsky.social · 14/05/2026
Wasn't that someone's childhood disappointment that it wasn't real? Or is someone making magic happen?
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Knelf @knelf.bsky.social · 14/05/2026
interesting... saw someone talk about that on the tube of you but given it was a "self stylised goblin: flip between cute drawings of same character with different expressions during the video style presenter" (if you know the type I mean) I kinda figured it was a joke!
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Knelf @knelf.bsky.social · 07/10/2025
damn... maybe I'm getting you confused with someone else who was posting about it (entirely possible)
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Knelf @knelf.bsky.social · 09/09/2025
@jeriellsworth.bsky.social back on twitter... were you a while ago talking about having fun with a graphics/pattern generating algorithm called something breakdown? might be misremembering the name - thanks if you can remember?
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Knelf @knelf.bsky.social · 21/08/2025
SO colourfull!
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Knelf @knelf.bsky.social · 21/08/2025
wow... like how!
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Knelf @knelf.bsky.social · 21/08/2025
boo not in UK
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Knelf @knelf.bsky.social · 21/08/2025
gosh! that's coming on great! love the intro effect!
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Knelf @knelf.bsky.social · 21/08/2025
oh wow! That's incredible!!
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Knelf @knelf.bsky.social · 03/08/2025
these are nice... weirdly remind me of er... Orco? (from Heman)
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Knelf @knelf.bsky.social · 05/07/2025
Think I had something like this going on with Arcadians with digital stick on SD128 and player 2
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Knelf @knelf.bsky.social · 04/07/2025
That's amazing!!!
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Knelf @knelf.bsky.social · 04/07/2025
Wow indeed!!!
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Knelf @knelf.bsky.social · 18/06/2025
www.youtube.com/watch?v=kTRO...
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Knelf @knelf.bsky.social · 18/06/2025
and turned out I was exactly in the middle of reading about the BRK vector so timing couldn't be better! Thanks, very interesting so far.
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Knelf @knelf.bsky.social · 18/06/2025
Good to see your stuff again. Twitter wasn't as good without you
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Knelf @knelf.bsky.social · 17/06/2025
AHH gotcha. So it is meant to be middle of the equals for the colour change but on the other emulators it is a character or something off. Very clever. Didn't know it was possible to switch mid scanline
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Knelf @knelf.bsky.social · 17/06/2025
stares blankly... not understanding the pixel meanings
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Knelf @knelf.bsky.social · 17/06/2025
oh wow that looks cool!
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Knelf @knelf.bsky.social · 17/06/2025
Thanks will try and read that. Actually super timely for me as been looking at user vector etc recently
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