thorpej

thorpej, 2 months ago to retrocomputing

Oh great #retrocomputing Tooters, I am in search of technical documentation for the #DEC KZMSA #XMI SCSI controller. It was known as "XZA_SCSI" in VMS and I believe "skz" in OSF/1. Anything helps! Merci!

thorpej, 2 months ago to VHDL

Hey there #FPGA hackers! If you want to do open source FPGA development on #NetBSD, now you can! I've just made pkgsrc packages for YosysHQ's icestorm, nextpnr-ice40, and yosys.

OK, go make cool stuff now!

thorpej, 3 months ago to c64

Hey folks, I've tagged the 1.0 release of my #C64 ROM replacer board now that I have confirmation that it works in all longboard revisions with 3 24-pin ROM sockets. Here's a link to the project on Github, and in the README there is a link to a shared project on PCBWay to make it super easy to order PCBs. There's a full parts list including links to a couple of US suppliers for most of the parts.

https://github.com/thorpej/c64-rom-326298

#commodore #retrocomputing

thorpej, 3 months ago to retrocomputing

NEXT DISTRACTION #retrocomputing #PET

thorpej, 3 months ago to c64

That Jameco order had the sockets I needed in order to finish my #c64 ROM replacer board. #retrocomputing https://github.com/thorpej/c64-rom-326298

thorpej, 3 months ago to random

Oooh, I got a fun little surprise with my Jameco order today!

thorpej, 4 months ago to random

Ok, folks, here's NetBSD/virt68k booting multi-user after running through the installer (but not configuring anything because this was just a smoke test).

https://www.netbsd.org/~thorpej/virt68k-boot.txt

This was a fun Christmas holiday project 🙂

#NetBSD #m68k #mc68040

thorpej, 4 months ago to random

Woot! NetBSD/virt68k boots the installer from a command-line specified RAM disk.

thorpej, 7 months ago to random

Mmm, linked lists in 6809 assembly.

thorpej, 8 months ago to random

The most important screen of the bunch. Had to get creative with the limited tile resolution (32x24) in Graphics I on the TMS9918A.

thorpej, 8 months ago to random

At long last, the 4th installment in my 6809 Playground home-brew computer series is up! Address decoding! Memory interface signals! Hooray! https://youtu.be/O01JqwB6kjc

eschaton, 8 months ago to random

Since AppleTalk and AFP are both deprecated these days, can Netatalk finally re-merge the AppleTalk and IP support into a unified project?

thorpej, 9 months ago to retrocomputing

Hey #retrocomputing enthusiasts! I haven't had a lot of time for the hardware recently, but I've been making progress on the software for my #6809 Playground with the help of an emulator that I wrote a couple of years ago when I started planning this project. So, here is a little teaser, along with a promise that more installments are coming! https://youtu.be/7JnC9MxZCYM

foone, 9 months ago to random

Socketed Toshiba TMP68HC000P-12, with 3.5" floppy disk for scale.

When you just need a 68k processor the size of a house

nixCraft, 9 months ago to random

My first tweet with the original Twitter UI. Back then, even politics was limited. It was just geeky folks. Then politicians and celebrities started joining and ruined it further. 😅

thorpej, 9 months ago to retrocomputing

Hey #6809 nerds! What's the fastest "multiply an 8-bit number by 10 into a 16-bit number" routine you can come up with? I just wrote up one that is tailored to this that plays with A being the msb of D that's 47 cycles. Barrow's book has a 16-bit x 8-bit that uses 2 MULs ... might be faster, but I need to count the cycles. Whatcha got, wizards? #retrocomputing

thorpej, 10 months ago to retrocomputing

Ok, #retrocomputing peeps, I have begun to chronicle the design and build of my #6809 home-brew machine here: https://www.youtube.com/playlist?list=PL_E3Je1H0xrvq1AOL1zlwj3LmrBiK8FJb. Enjoy!

thorpej, 10 months ago to random

Nothing quite like a 2-voice Tesla coil synth.

video/mp4

taylorlorenz, 10 months ago to random

Right wing influencers are convinced the Instagram Threads logo is the mark of the devil

Right wing influencers are convinced Threads is the mark of the devil
Right wing influencers are convinced Threads is the mark of the devil
Right wing influencers are convinced Threads is the mark of the devil

thorpej, 10 months ago to retrocomputing

“New” toy. Post-Soviet Ukrainian manufacture. #z80 #retrocomputing

image/png
image/png

thorpej, 10 months ago to retrocomputing

Ok. I have a device with an active-high totem-pole interrupt output. It needs to interface to an active-low interrupt line that expects open-drain interrupt outputs. My first inclination is to just use a small-signal MOSFET to add an open-drain interrupt output to said device. BUT, circuit around the device has spare 74HC04 inverters, so I guess I could use one of those and a diode.

WHAT SAY YOU GREAT SAGES OF ELECTRONICS MASTODON?

#retrocomputing #6809