Recent content by atariquest

The MIO was often sold in kit form. The test tape contains programs to help test and diagnose the functions of the serial, parallel, and cassette interfaces after a build. In addition there is the sync stream to help set optimum volume and tone levels on a cassette player. This sync stream us...

See attached photo for my mystery memory board. Does anyone recognize the board? I purchased this board as part of a five card lot on eBay. I bought the lot just to get a fairly rare Vector Graphic 8080 CPU board. - The top section is all MM2102 1024x1 SRAM. If I am doing my math correctly...

Ejona, Thanks for taking the time to respond. I am fairly confident I can reverse engineer the board. Just hoping someone already has a manual. VG manuals are usually well written and will probably contain some small starter projects and source code. FYI ... I have a few other S100 boards (some...

I just purchased a Vector Graphic - Precision Analog Interface board. I want experiment with both inputs and outputs. Does anyone have documentation on this board? Thanks, Marvin

Those smaller capacitors were made by Sprague. They were acquired by Vishay in the 90s. Luckily, they still manufacture the TE series of capacitors. They are expensive for a capacitor $2-8, but that is not too bad. https://www.vishay.com/docs/42042/te.pdf I think these are special order, which...

If you decide to work on the monitor, user ajacocks provided a schematic. Typically a schematic like this will be included inside a service manual that gives details for the theory of operation, parts lists, and test point values. Perhaps you can find a service manual. On the schematic you will...

I have several Apple II 8-bit machines, but I have not used a IIGS since the late 80s in high school. If I understand your post correctly, you are not certain of the IIGS is working. Does it show any sign of life like a light or beep when you turn on the power? I do not thing you specified...

Have you try changing the interface mode setting on the printer to parallel yet? Marvin

What you have is a Canadian computer. Andicom was acquired by Nabu. The computer you have continued life as the Nabu 1600. Check out David Dunfield's website for info including manuals for the Nabu 1600. Scroll to the bottom and you will see the Nabu 1600 that looks identical to your Andicom...

Now that you know for sure it is parallel / Centronics that cabling is straight forward (DB-25 to centronics). https://www.amazon.com/C2G-02798-Centronics-Parallel-Printer/dp/B00005114K I noticed in your newest photos the use of a Citizen branded printer. That printer emulates the Epson FX...

I got out one of my II Plus boards today and confirmed that the cap's positive lead is connected to the +12v rail.

As Kelly Gray indicated, the capacitor is tying one of the voltages to ground. This is know as a decoupling. I am not sure which voltage that pin is connected to without probing one of my boards. High frequencies will travel through the capacitor to ground, thus removing them from the voltage...

My first IT job out of college was working in a hospital. One of the things I had to do often was interface labratory equipement via serial to printers, computers, other equiment, and the TCP/IP network. Back then I wrote my own serial "sniffer" in Tcl/Tk to diagnos issues and figure out things...

The Pi1541 is a PCB that connects to a Raspberry Pi3 (multiple versions) via the expansion header. Instead of running an operating system on the Pi, you run the Pi1541 software which emulates a 1541 and supplies a basic filesystem for storing C64 disk images of floppy disks. There are newer PCBs...

Is this from Spring Hill, TN? I noticed one on FB the other day. I live in College Grove. This was made at the end of S-100 computers era. It tried to go head to head with the IBM PC and we all know how that turned out. It is a hybrid in a couple of ways: it has both 8-bit and 16-bit...