Tandy@ Model 2000 Service lvlanual
L/ Introduction
The Radio Shack I'lodel 2000 Personal Computer is modular in
design to allow maximum flexibility in system configuration.
The basic computer consists of a lvlain Unit, a detached
keyboard with coiled cable for positioning the keyboard in
the most convenient location, and a monitor. The lv1ain Unit
may be supplied with two internal floppy disk drives or one
floppy disk drive and one internal hard disk drive. The
standard monitor used with the Model 2000 is a monochrome
displ-ay (green phosphor) which has a standard screen format
of 80 characters width and 25 lines vertical. Since this
unit is modular, it may be placed on top of the Main Unit or
at any location convenient to the operator.
Internal floppy diskette storage is provided by either one
or two 5-I/4" floppy disk drives. If the unit is supplied
with two of these units, total internal memory storage
capacity is L.46 l4bytes. When supplied with the internal
hard disk and one floppy disk storage unit, total internal
memory storage becomes 10.73 Ivlbytes.
An optional Color l'lonitor may be used with the Model 2000 to
provide up to eight of sixteen different colors on the
screen at one time. This optional feature requires the use
of a color monitor PCB assembly which plugs into one of the
mother board slots at the rear of the Main Unit.
An internal 128K RAt't board is standard on the Model 2000.
An option to the Model 2000 is an additional 128K RAM board
which provides expansion to 256K. Both boards are mounted
internal to the Main Unit. An additional optional feature
is a 256K RAM board which connects to the internal
motherboard of the lt{ain Unit. It is populated with 128K RAM
which may be expanded to 256K RAf',[ with the addition of RAM
ICs. Two of these boards can be installed into the
motherboard in the unit's card cage assembly. With aII
these options installed, the Model 2000 then has internal
RAM memory capacity of 758K bytes.
Other options include a IY/Joystick input, a mouse/cl-ock
option which aIlows input from a hand-positioned interface,
a monitor pedestal, black and white graphics option, and a
f loor unit which mounts the l"lain Unit vertically.
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