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TRS-80 Pocket Computer 4

Manufacturer Casio - OEM to Tandy/Radio Shack
Model PC-4
Date Announced 1983
Date Canceled Unknown
Number Produced Tens of thousands
Country of Origin Japan
Price $70
Current Value $10-$25
Processor HD 61913 CMOS
Speed ~.5 MHz
Storage Optional micro-Cassette
Expansion Connectivity to docking station/expansion interface with printer, cassette, etc.
Bus Proprietary
Video 12x1 text
I/O Cassette, Printer
OS Options Built-in BASIC
Notes The TRS-80 line of Pocket Computers were actually re-badged imports. In this case, the PC-4 was a re-branded Casio PB-100.
Related Items in Collection TRS-80 Pocket Computer 3 and other TRS-80 systems.
Related Items Wanted Docking station, software, etc.

The TRS-80 PC-4 was one of the low-end pocket PCs offered by Radio Shack in the early 1980s. It was fully programmable in BASIC but had limited memory and display capabilities. Expanded with a docking station it had a small printer, micro-cassette and, potentially, a bit more RAM.

TRS-80 PC-4 with manuals, etc.

The PC-4 in my collection was generously donated by Steven Pigeon

(Submitted June 11, 2016 12:15:32 by Ron Lauzon)

I purchased one of these with my high school graduation money and used it through college and into my first job. I passed it on to one of my nephews, where it disappeared. In a fit of nostalgia, I located one on eBay (with the memory expansion module!) and purchased it. It's surprisingly still usable today.

(Submitted January 3, 2016 18:27:41 by Michelle)

I got a PC4 for Christmas when I was in Junior High School and used it all the time. I found it yesterday in a box of old calculators and discs. It brought back so many good memories.

(Submitted February 18, 2014 09:34:13 by stephen russell pierce)

i am interested in a trs-80 pocket computer model 4 with docking station as i am interested in a portable computing device that has no floppy disks,and no large display screen due to power considerations,as well as the docking stations and all assorted periphals that come with it as well as all supporting documentation and programing manuals as soon as possible,in addition to which i ould like to buy it in the boston,massachusetts area,preferably in an establishment acessible via north station,boston,massachusetts commuter rail facility.

(Submitted February 21, 2014 12:00:08 by stephen russell pierce)

i am interested in purchsing a trs-80 pocket computer 4 as soon as possible with all accesories and accompanying manuals.i live in boston,massachusetts and need a place in that area to buy one around the first of the month of march,2014

(Submitted January 13, 2014 15:31:08 by Rob)

Over the course of my 5th grade and 6th grade allowance I purchased a new PC-4, 1kb RAM upgrade, cassette interface and printer. Eric asked about software. About 1985 I asked a Radio Shack employee if there was any published software for the PC-4. He consulted a catalog behind the counter and could not find any. The manual came with a few programs for self-entry but other than that you were left to your own ability, imagination and determination to write your own software. I still have my PC-4. I used it regularly from 1983 to 1991.

(Submitted October 9, 2010 02:32:34 by Axel)

I could have sworn my uncle had one of these. I wonder if he still has it, or if he ever had it. He had been big on the computers for awhile in the late 80's. Hmmm...

(Submitted November 4, 2009 06:06:49 by Eric Lentz)

Ah, this takes me back. I still have my pc-4 with all the addons for it. The tape adapter, the mini-printer with thermal paper and tape player. The only thing I never got I think was the memory expansion for it. Seeing Egon use the PC-4 in the first Ghostbusters movie keeps bringing back fond memories of when I used it for college. I wonder if anyone had any cool programs for it like I did?

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