@kieranhj.bsky.social
Software developer & Engineering Manager. Formerly Rare, Xbox, HoloLens. Now helping invent the future of AI at Google DeepMind by day. Developing retro games & demos by night for BBC Micro & Acorn computers as kieran^Bitshifters. #demoscene
@kieranhj.bsky.socialDepends if you care but the GitHub repo is all Claude Code commits, forked from Eben Upton's Beeb Wireframe Doom, which is also all Claude Code commits. 🤷 (As you know, I'm also using Claude Code for many retro projects, so this is not a judgement, just info.)
@keefstuart.bsky.socialReposted by @kieranhj.bsky.socialThere is a concert of choral video game music tomorrow at the beautiful St Martins in the Field!
@markmoxon.bsky.socialReposted by @kieranhj.bsky.socialNew: Four interactive guides for building 8-bit Elite from Bell and Braben’s original source disks… all in your browser
Covers the #BBCMicro, #Commodore64, #AppleII and 6502 co-pro versions of #Elite
Links in the first section of my deep dives:
@kieranhj.bsky.socialLooks great! I didn't know you were working on this. Claude assisted or hand-rolled? (No judgement either way; I've got 4x Claude retro projects on the go that need to get finished soon, but also props if you've got a nice road engine running from scratch.)
@kieranhj.bsky.socialI asked higher powers (i.e. my emu coding buddies) for suggestions and they came back with this: From memory, Revs has an interlaced display, so each CRTC frame is 312.5 scanlines? The CRTC needs to be starting a new frame every 20,000 microsec (312.5 * 64) rather than every 19,968 (312 * 64).
@andylemon.bsky.socialReposted by @kieranhj.bsky.socialHappy Saturday! Today's #MODtober archive post - an #amiga #protracker #chiptune by me from TTE's Amiga production Textual Healing 2 #demoscene <3
@h0ffman.bsky.socialReposted by @kieranhj.bsky.socialIn case you missed it, me and @gigabates.bsky.social did a little something, like 256 bytes little. #TTE
@martinpiper.bsky.socialReposted by @kieranhj.bsky.socialA deeper technical dive for the circle scroll part in the #Commodore64 demo "Viva Las Vegas". It uses two bitmaps, with extra colour fetches, using a timed stabalised NMI with auto ACK, and has background colour updates timed with the raster beam.
youtu.be/KjuSMGK8TJU
@h0ffman.bsky.socialReposted by @kieranhj.bsky.socialWe begin this year's #MODtober uploads with a proper little roller. Taken from the game Eugatron, it earned its name when Korruptor (the original developer) requested the player's collision box be shrunk by 1 pixel.
@failbettergames.comReposted by @kieranhj.bsky.socialWe're hiring! We're looking for a Writer and Narrative Designer to join the Fallen London team at a senior or mid level.
This position is permanent, remote, and full time, which for us means 35 hours a week.
@h0ffman.bsky.socialReposted by @kieranhj.bsky.socialUnstable Radio - New Wobbly Tunes - Live now!!
@kieranhj.bsky.socialWut? Did you approach them, or did they approach you after seeing it on social media?
@h0ffman.bsky.socialReposted by @kieranhj.bsky.socialLive now, doing some Amiga 68000 coding today, because I need to hide the NeoGeo projects :D :D
@kieranhj.bsky.socialPerhaps DM me.
@kieranhj.bsky.socialThere's more info about the game and some software archaeology here: stardot.org.uk/forums/viewt...
@rougol.bsky.socialReposted by @kieranhj.bsky.socialJoin us in the pub (or online) on Monday 21st to chat with Mark about how he added two player duels to the original Elite. We will have a Beeb there so you can test your flying skills against others!
rougol.jellybaby.net/meetings/ind...
@negativecharge.bsky.socialReposted by @kieranhj.bsky.socialI've posted many C64 SID to SN76489 conversions previously. These are pre-processed register dumps with large memory footprints and need compression / SWRAM. What you're seeing here is actual SID playback with dynamic SN76489 conversion. A game changer thanks to @kieranhj.bsky.social's AKS work.
@matt.godbolt.orgReposted by @kieranhj.bsky.socialThe Bloop Museum is awesome! Drove 8 hours to visit it with my son a few months back! Great to hear it's getting some celebrity endorsements :-)
@lauriewired.bsky.socialReposted by @kieranhj.bsky.socialHad fun speaking with @bloopmuseum today at CppCon; if you’re here, swing by their booth while they’re around!

 I haven’t been yet, but they’ve apparently bought out a huge abandoned government building in Pittsburgh and are filling it with a ton of vintage computing equipment.
@kieranhj.bsky.socialWorth checking the links that specify sideways RAM or internal ROM sockets. I can't remember how much testing we did back then or just assumed that all 64K was available. Does Paradroid run as it has robust RAM bank checking?
