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Tandy Radio Shack

The TRS-80 model II, is the obscure brother of the TRS-80 family. Many internet pages deal with the models 1,3 and 4 but omit the model 2... This is maybe because the TRS-80 Model 2 was intended to be a business computer for use in offices and labs. Thus it is equiped with a full height Shugart 8'' drive with a capacity of 500k which is a lot compared to the 87k offered by the TRS-80 Model 1 system disk.
It is also possible to connect up to 4 floppy disk units, so you could have 2MB disk space online !

It runs under TRSDOS, but can also achieve CP/M compatibility.

Options for the machine included a hard disk controller, an arcnet network card, a graphics card and a 6 MHz 68000 board set with extra memory (up to 512K) so it could run XENIX.


Mark Brumlik reports to us:
Actually, there was a Hi-Res Graphics Mode for this machine, which mapped every pixel on the screen (still in monochrome). There was very limited software for it.
The machine had the capacity in hardware to utilize multiple 64K banks of memory but this was never implemented in production software. This is the same techiique the IBM PC and other clone 8-bit machines achieved 640K of memory (10 banks of 64K).

Edward Griffin adds:
This machine could also read IBM formatted Mainframe and data entry unit disks. The data entry units (IBM 3742's I think) would write information directly to 8 inch floppys as the operater depressed the Carriage Return button, and then the disks could be taken from these large units and insterted into the drive of the model II for verification and other checking. I recall a Model II being expressly used for this purpose. It also came with a neat Radio Shack acoustic coupler!!
These machines did experiance frequent power supply problems though!

MANUFACTURER  Tandy Radio Shack
TYPE  Professional Computer
YEAR  May 1979
BUILT IN LANGUAGE  Basic delivered on disk
KEYBOARD  Full-stroke keyboard with separated numeric keypad
CPU  Zilog Z80 A
RAM  32 / 64 KB depending on models
ROM  Unkown
TEXT MODES  40 x 24 / 80 x 24
GRAPHIC MODES  None, but 32 graphical symbols are available to simulate graphics
COLORS  monochrome built-in monitor
SIZE / WEIGHT  Heavy !
I/O PORTS  Centronics/Parallel port, 2 x serial/RS232 ports
BUILT IN MEDIA  One full height Shugart 8'' drive, single sided floppies with a capacity of 500K
PRICE  $3,450 (USA, october 1979)

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