Click Here to visit our Sponsor
The Latest News ! The History of Computing The Magazine Have Fun there ! Buy books and goodies
  Click here to loginLogin Click here to print the pagePrinter ViewClick here to send a link to this page to a friendTell a FriendTell us what you think about this pageRate this PageMistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine
Browse console museumBrowse pong museum


C64 maze generator T-shirts!

see details
Ready prompt T-shirts!

see details
Spiral program T-shirts!

see details
Pixel Deer T-shirts!

see details
BASIC code T-shirts!

see details
Shooting gallery T-shirts!

see details
Pixel adventure T-shirts!

see details
Breakout T-shirts!

see details
Pak Pak Monster T-shirts!

see details
Vector ship T-shirts!

see details


Tandy Radio Shack

The model 3 is generally regarded as the successor to the Model 1. Its two 5.25" floppy disk drives could convert model 1 disks.

Initially Radio Shack wanted to sell both the model 1 and 3 at the same time, but the FCC forced them to stop selling model 1. Is so they were discontinued because of the excessive radio noise that they put out.

However, the Model 3 wasn't FULLY compatible with the model 1. There were differences in ROM which meant some programs had to be converted, especially those machine language ones that made ROM calls.


Model III configurations, by Dave Thompson:
TRS-80 Model III was sold in multiple configurations.
No hardrive configurations included:
Model III with Level 1 ROM, 8k RAM sold for US$799. Model III with Level 2 ROM, 16k RAM sold for $999.
The first floppy drive cost $849, and could store 168k. The second drive was cheaper, and could store more. The price difference is due to the first one included the drive controller. The increased space on the second drive (189k) was due to the first drive must also contain some TRS-DOS (the operating system).

Brandt Daniels adds:
There was also a TRS-80 VideoTex Computer terminal in 1980.

Mark Fowler reports:
I worked for a company in 1982 that had integrated a 5MB, and later a 10MB hard disk into the TRS80 Model III. It was then programmed in FORTRAN-66 as a dedicated medical records system, to mimic the pegbook accounting system in use in the 1980's. We introduced green phosphor, and later amber phosphor display tubes. Some systems were used with a modem to do simple email-type applications, and to access various bulletin boards.

MANUFACTURER  Tandy Radio Shack
TYPE  Home Computer
YEAR  1981
KEYBOARD  Full-stroke keyboard with separated numeric keypad
CPU  Zilog Z80 then Z80A
SPEED  2.03 MHz
RAM  16 KB (up to 48 KB)
ROM  14 KB
TEXT MODES  32 or 64 columns x 16 lines
GRAPHIC MODES  128 graphic characters
COLORS  monochrome
I/O PORTS  Tape (500 or 1500 bauds), Centronics, RS232
BUILT IN MEDIA  Zero, one or two 5.25'' disk-drives.
OS  TRS DOS (other OSes were available : New DOS, LDOS, MultiDOS, ...)
POWER SUPPLY  Built-in power supply unit
PERIPHERALS  Various Tandy peripherals
PRICE  No disk model : AU$1450 (Australia, 1981)
$2495 in 1984 for a complete system with 2x360 KB drives, TRSDOS, 64kb Ram, software and printer

retro computing t-shirts and goodies
3D Cubes
BASIC code
C64 maze generator
Pak Pak Monster
Pixel adventure
Pixel Deer
Ready prompt
Shooting gallery
Spiral program
Vector ship

Related Ebay auctions in real time - click to buy yours

Click here to go to the top of the page   
Contact us | members | about | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -