Tandy Radio Shack TRS 80 Model 4p

I’ve been after a TRS 80 for quite a while and haven’t found a good combination of price x condition until now. The 4p model I got is in very good condition, and only slight yellowing of the case. It is completely functional and i even got some nice extras with it like an original manual and a LS-DOS 6.3 floppy.

This is a 1983 computer and it is a very interesting picture of that time. It has some clear advantages over some of the competitors of that time (embeeded drives, nice keyboard) but also some clear drawbacks (low end graphics, harder to expand). The TRS line definitely didn’t have the appeal of computers like the Apple II (it had the unfortunate nickname of ‘Trash 80’) or even the power of the IBM 5150. But still, I am loving having this around and running old programs out of 30 year old floopies. The Model 4P can use all Model 4 disk software and it can run all Model III TRSDOS and LDOS disk programs (in Model III mode). It is compatible with the CP/M Plus operating system so there are thousands of applications for it out there.

Also, I’ve found out that there is a great and very active community out there that still supports the TRS 80 line. Ira Goldklang’s site is a great starting point for anyone interested in this computer.

So far, my computer has been working great and I’ve been having lots of fun. Here are the specs:

NAME TRS 80 Model 4P
MANUFACTURER Tandy Radio Shack
TYPE Home Computer
YEAR October 1983
KEYBOARD 70-key typewriter-style with datapad, plus CONTROL, CAPS and 3 programmable function keys (F1, F2, F3)
SPEED 4 MHz (2 MHz in Model III mode)
RAM 64K RAM, expandable to 128K. Provides for disk drive emulation in RAM, only 64K addressable from BASIC
TEXT MODES 80 x 24 (Model 4 mode), 64 x 16 (Model III mode), or double-width 40 or 32 characters per line. Upper and lower case. Reverse video (Model 4 mode). 96 text, 64 graphics and 96 “special” characters
COLORS Monochrome (9″ green-screen display)
SOUND Buzzer
SIZE 16-1/2 x 13-1/4 x 9-3/4″
I/O PORTS Parallel printer port. RS-232C serial port. Selectable 300-9600 baud. Buffered input/output bus
BUILT IN MEDIA Two built-in double-density 184K 5-1/4″ drives
OS TRS-DOS 6.0 to 6.2, LS-DOS 6.3, CP/M

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