Recent content by Slob

Thank YOU!

They were, that on the VCC/GND page, the LS245 is connected to -9 instead of ground, there is only one GAL and one LS273 shown, and there are two LS367's shown (there's only one AFAIK). I would (and did) put bypass caps on the GAL, ROM, RAM, and 4049 especially with wire wrapping but that's...

This is my build of jim Loos’s 8008 SBC. A few differences were the use of a crystal, not an oscillator can (spare 4049 gates were used). I added a power good display, and used a DC-DC converter for the -9VDC (serial interface built with old-time RS-232 chips). I used a 27C256 (I have lots)...

Ha ha, I’m working on it…although I wrapped an 8008 about 25 years ago, it was just a demo board and couldn’t run SCELBAL…

On my “bucket list” was building a 4004 single board computer. I’ve collected the parts over the years but have tried to use them and generally failed. Over the last few years, Github projects popped up that made this fairly easy and productive. I couldn’t decide which to build so I wire wrapped...

On refinishing keys that have discolored, when I had time and un-diagnosed OCD, !!!AND AFTER DETERMINING THAT THE KEYTOPS WERE DOUBLE-SHOT MOLDED!!! (the ADM-3A's are), I would sand the keys with 1000-1500 wetordri (wet) and then polish them with automotive polishing compound by hand (machines...

I have two ADM3a's, one is beige with a brown base and one has a blue top. I put in new CRT's (old-timey blue-white, not the later paper white available in the late 80's+ color). I've been paranoid about burning those screens and on my to do list is a hardware screen saver for them. One of mine...

I have a several pieces of 1960's portable audio equipment (tape recorders, transistor radios) with positive ground adapters. I think that this fell out of favor in the 1970's. At one time, most cars had 6V positive ground.

Windows 10 is just awful. The enormous flaw in it is tthat they tried to make it usable on a tablet AND on a laptop, and they failed miserably at both. On top of that, the designers of it and all of the other Microsoft components obviously fell to the "leave your mark on the fire hydrant"...

I would say that a good number of adults, particularly young adults, need those classes as remedial classes.

I have seen a remarkable decline in self-sufficiency and even common sense among young people. This has profound effects in a society. I have read that "Home Improvement" type stores are panicking because young homeowners can't do ANY home maintenance, like, fix a toilet, change a faucet, change...

Having "restored" two ADM-3a's, They work and except for the CRT's and "doors" (which I replaced with aluminum, a magnet, and handle), as far as I am concerned they are "restored". Keep in mind that it's fairly common for antique radio restorers to pull the guts out of 70-year old capacitors...

I worked for a company that used HyType II subsystems, and then went to Qume, after designing a look-alike case for it out of the plastic foam that computer equipment like terminals were made of at the time. I had to repair both types. Pluses of Qume's: Likely cheaper Lighter Simpler...

I'm not sure how people on this board feel about emulators, but... I have been spending the evening playing with the LILYGO TTGO VGA ESP32 Module V1.4 and FAB-GL, a very nice Arduino library and it's "demo" IBM-PC emulator. Let me say, that for $18 and some stuff virtually everyone reading this...

I built (scratch, not from plans) a very small bartop with one of those "60-in-1" Chinese boards. This was the smallest design I've seen with a joystick, rollerball, and a coin acceptor. I feel that the coin acceptor is a crucial part a home arcade. If you don't put the coin in and hear the...