Infrared sensor

... is an array of 4K7 resistors, if I remember the codes correctly, 8 of them with a common connection for one end. Usually used for pull resistors on bus lines.

I kept one of these running until 1999 on my boat. Increased the memory by 640 k, converted it to run on 12 VDC and used it to process and display weather faxes received by sideband radio. Never failed me in all those years. Your article brought back some nice memories - thanks!

Can you set it up so that we can click on the full-size pictures and then to click next and previous while remaining in full-size?

Near as I recall, the PC Jr. was not released in 1987, it was discontinued that year.

My memory could be fading but as far as I recall, the company I worked for in 1984-86 purchased one and then promptly dumped it as being unusable. I left there in early 1986 but I still remember a couple of friends who still worked there getting an Xmas present in the shape of finding the doors locked and the offices cleaned out when they came to work on Friday, Dec. 19th. The staff's personal stuff was either taken or thrown in the dumpster.

While the copyright you show on the PCjr is 1983, the PCjr was announced in February, 1987. I know because I did the announcement for my IBM branch office and I was 7 months pregnant with my son, who was born in April 1987. At the announcement I told the audience we were "adding to the PC family" and "I wasn't sure why they picked me to do the announcement." I got a good laugh. The copyright was likely acquired while the machine was in early development.