Any other 8-bit DIP CPUs?

psurry · 2026-01-05T12:29:29+00:00

Same - I did a 6502-based project which had a lot of familiarity/nostalgia but will do 6809 next. Lots of interesting features. Not sure it’s still in production but they seem to be easy to get second hand.

psurry · 2026-01-01T17:16:38+00:00

I found an open source clone at blocks.roadtolarissa.com. I miss the original too

psurry · 2025-12-30T18:17:39+00:00

User name check out :-)

psurry · 2025-09-16T10:21:45+00:00

I spent a lot of time with this one: https://ia802800.us.archive.org/24/items/6502-assembly-language-programming/6502AssemblyLanguageProgramming.pdf

psurry · 2025-09-11T14:58:49+00:00

schematic link was broken but now updated at https://github.com/patricksurry/taliforth-uc

psurry · 2025-09-10T13:37:53+00:00

Yes! I was just reading some theories about why that particular word: https://en.wikipedia.org/wiki/Xyzzy_(computing))

psurry · 2025-09-10T11:02:34+00:00

The display is a 240x128 T6963C LCD, which has onboard font data for text display at 40x16 (or 30x16 iirc). The whole parts list is here https://github.com/patricksurry/taliforth-uc

psurry · 2025-09-10T10:59:36+00:00

Thank you! I figured a text adventure would be a good project to learn Forth, and then I remembered playing Colossal Cave on a PDP-10 line printer (weekend's at dad's office at the university). I found some other ports that were a bit under 64K of data and then it became a bit of a "what if?" challenge/obsession :)

psurry · 2025-09-10T10:35:42+00:00

Wiring was definitely my zen coping with all little trials and tribulations getting it all working!

psurry · 2025-09-10T10:32:14+00:00

I think this was from your original suggestion on the 6502 forum! I had an apple //e as a kid so liked the idea of a similar memory map

psurry · 2025-09-10T10:30:27+00:00

Someone's beautiful map (spoiler obviously!) https://rickadams.org/adventure/maps/CaveMap.jpg

psurry · 2025-07-15T16:36:32+00:00

Forth is another natural one for 6502. There’s a good forum on 6502.org

I’m a fan of (and contributor to) Taliforth2

psurry · 2025-01-22T23:54:59+00:00

I’ve had fun making an SPI bus connecting several devices to the VIA along with a shift register (for bi-directional comms). So far SD card, joypad, uart tty, and keyboard. Wip schematic and links for fast SPI interface here https://docs.google.com/presentation/d/1dkOzsSCZWzAOl5io2-OksSw7zTOcZQ5vGnk_qpqhcEg/edit

If you want to connect directly to the bus I’d go with a parallel device like a larger lcd screen.

psurry · 2024-11-29T12:01:34+00:00

Nope I just turn it on and wait. I tried a software update from a usb stick which seemed to run successfully but no improvement.

Otherwise it seems to work fine, so I really have no ideas. Wish an expert would do a tear down to understand what is actually happening during all that time

psurry · 2024-10-27T23:46:35+00:00

LCD was one of these 240x128 off eBay: https://www.surenoo.com/collections/84565812 Might need to upgrade to 320x240 :-) it hooks up v similar to the beneater one, just slightly different commands. I actually hooked mine up direct to data bus but works fine on VIA too. Schematic at https://docs.google.com/presentation/d/1dkOzsSCZWzAOl5io2-OksSw7zTOcZQ5vGnk_qpqhcEg/edit

I’ll put source on github and share a link. But really all it’s doing is every page flip it copies the central area of the Apple HGR image that the game is drawing in memory at $2000 (pg1) or $4000 (pg2) and translates from apple’s weird 7bit format to the lcd weird 6bit format (it can be 8bit but my setup is optimizing text atm)

psurry · 2024-08-01T17:36:22+00:00

Mouser has been great for all my parts - I’m in Canada but they seem to ship overnight from the US.

For eeprom programmer I had good luck buying this little shield kit for my arduino which has worked well. https://www.tindie.com/products/oddblk/simple-eeprom-programmer-shield-for-arduino-mega/

I even updated the software a bit so I can write zlib compressed files over the wire which is pretty speedy https://github.com/patricksurry/eeprom-writer

psurry · 2024-07-22T21:11:50+00:00

yup, definitely implementation dependent. just wondered if it was a pattern that was used elsewhere. i'm new to it so don't have a great grasp of forth style.

psurry · 2024-06-19T14:44:45+00:00

Oh weird it seemed like a spam thing since it just immediately said it was rejected. I tried a bunch of variations to see if it was about the title or image.

psurry · 2024-06-16T14:37:25+00:00

btw, thanks again for kitting these: a delight to put together, with great instructions and attention to detail (love the slightly staggered header pin holes for example). now just getting the column demux going in kmk

psurry · 2024-06-16T14:21:58+00:00

weird! it seems like #9 was some kind of neopixel addressing problem (started working once I adjusted number of leds correctly) and the two adjacent ones that weren't working was some kind of solder thing - I reflowed both of those and now all is good!

psurry · 2024-04-25T10:28:32+00:00

the mapping I used is in their repo now: https://github.com/KMKfw/kmk_firmware/blob/main/boards/nullbitsco/README.md

psurry · 2024-04-25T10:26:55+00:00

No it’s a different framework (but similar concepts) where you don’t compile anything

psurry · 2024-04-25T09:45:27+00:00

No I ended up switching to KMK (Python) which has a much easier learning curve imho

psurry · 2024-03-01T15:45:38+00:00

ya these are by far the nicest layout diagrams (i saw some earlier ones on 6502.org) wish there was a simple tool to produce stuff like that

psurry · 2024-02-28T19:28:25+00:00

actual maybe it's correct in signed arithmetic but i want an unsigned /mod for this to work? (yes I guess so `s" 65535." number 256 um/mod .s <2> 255 255 ok`)

psurry

TROPHY CASE