Articles by Sub-Etha Software

In my day job, we have a device that needs data sent to it with the bits reversed. For example, if we were sending an 8-bit value of 128, that bit pattern is 10000000. The device expects the high bit first so we’d send it 00000001. In one system, we …

I gave it this: clear lda #96 clearA ldx #1024 loop sta ,x+ cmpx #1536 bne loop rts …and ChatGPT gave me this: The clear subroutine in this code is used to clear the screen and initialize it with a grid of green squares. The subroutine begins by loading …

I’m just going to leave this here… Visit https://chat.openai.com/chat to try it yourself… …

Recently on LinkedIn, I saw a post by Rogelio Perea about his Tandy Model 102 portable computer. Although I never owned one, I remember this machine well. I always wanted one. Having a “portable” computer really wasn’t a thing back in those days, and this one even had a modem …

The Insta360 app has an option to change the password on the X3 camera. This may also work on other cameras, but I have not tested it. I have done a password change, but have not verified this actually did anything. This option will cause the camera to display …

For a future project, I need to make use of remote triggers. These could be motion sensors, beam sensors, pressure mats, etc. The ZigBee standard seems to be the way to go since I can find cheap consumer motion sensors that run on batteries. There also seems to be ZigBee …

Earlier this month, I received a message on my Sub-Etha Software Facebook page from author (and former/current CoCo programmer) Carl England: I knew CHR$(13) was a carriage return, so this was creating a file name that contained carraige returns. What would that do? I typed it in to find …

See also: part 1, part 2 and part 3. Welcome back to the days when an IBM Compatible PC required a floppy disk just to start up. You would boot to PC-DOS (on an actual I.B.M. machine) or MS-DOS (for a clone, like the Tandy 1000 that had just come …

See also: part 1, part 2 and part 3. Obtaining a Time Machine Since most of us will not have a 64K Radio Shack TRS-80 Color Computer laying around, as well as a disk drive and the original OS-9 floppy disks, I suppose running an emulator on your PC/Mac/Linux machine …

See also: part 1, part 2 and part 3. NOTE: The images in this article were taken from the excellent Radio Shack Catalogs archive website: https://www.radioshackcatalogs.com/ 1984 was a big year for home computers. Not only was the Apple Macintosh released with that famous 1984 Superbowl ad, but Microware’s …