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
Vector ship T-shirts!

see details
Pak Pak Monster T-shirts!

see details
Breakout T-shirts!

see details
Pixel adventure T-shirts!

see details





T > TANDY RADIO SHACK  > TRS 80 MODEL 4   


Tandy Radio Shack
TRS 80 MODEL 4

The TRS-80 model 4 (ref 26-1068/69) was one of the last models of the TRS-80 series (and perhaps the less known). It ran at 4 MHz and displayed 80 columns x 24 lines in Model 4 mode, but was fully compatible with the TRS-80 model 3 and in Model 3 mode actually displayed 64x16 and ran at the Model 3's 2 MHz.

It had 64 or 128 KB RAM, the 64 upper KB being used as a ram disk. It had one or two 5.25" floppy disk (184 KB each) and ran under TRSDOS 6.0 or 1.3, LDOS or CP/M.

A transformation kit "TRS80 model III -> model IV" was available.

The Model 4 was followed by the Model 4D (ref. 26-1070). The only difference being double sided drives -384 KB, instead of single sided drives.

A portable version of the Model IV called Model 4P (ref. 26-1080) was also marketed few time after.

_______________________

Dwight Briney specifies:
A graphics adapter was also available for the Radio Shack TRS-80 Model IV in 1983. It came with a graphics programming language (BASICG). I used BASICG to program a basketball shot chart program that was used for a few seasons until I finally converted it to the IBM compatible Hercules graphics adaptor that had higher resolution.
It all seems pretty primitive now, but it worked great at the time.

Special thanks to Charles Harris who donated us this computer !

ShareThis


 

To Jeffrey Joseph who posted a nice response. I, too, had a gate-array with the split arrow keyboard. Why? I had purchased the Model 4 and discovered it had a different keyboard than the Model 4 I already owned (non-gate). At the time I was not knowledgeable between the gate and non-gate systems though I had noticed the printer port was pointing out of the back instead of the bottom. I always played video games on my Model 4s and Model 3s and even the Model 3 had the same split arrow keyboard. On the new gate array, I was dismayed with the new clumped arrow keys and hated it for playing games. i actually found a supplier and bought an old split arrow keyboard and replaced it myself in the gate array. It was very easy. So, that''s how I ended up with the split arrow keyboard on my gate array Model 4.

          
Friday 11th September 2015
David Coffey (Florida, United States)

I had several Model 3''s, Model 4''s and one Model 4p. Loved these little systems. The last Model 4 I owned in 1995 I purchased a Zilog Z-80a chip and replaced the Z-80 I had in it. The Z-80a ran at the same 4Mhz but it had the added ability to boot from an external hard disk drive without the need of a floppy. I had a 15MB hard disk drive (MFM) for my Model 4.

          
Friday 11th September 2015
David Coffey (Florida, United States)

It''s not quite accurate to say that double sided drives was the only thing to change in the Model 4D. It would lead you to believe that the ''D'' stood for double sided. In fact the ''D'' stood for "Deskmate" which was a piece of software that worked as a pseudo GUI (keyboard controlled) and also contained some simple productivity software like a text editor, spreadsheet, database, terminal program, scheduler, and an ''email'' program that allowed you to send messages to any other deskmate user via modem.

These were very basic applications without any bells and whistles but was good if you didn''t want to deal with the command line or if you just needed basic productivity software.

          
Sunday 1st February 2015
Chuck Rose (Vermont/USA)

 

NAME  TRS 80 MODEL 4
MANUFACTURER  Tandy Radio Shack
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1983
BUILT IN LANGUAGE  None
KEYBOARD  Typewriter style 83 keys with numeric keypad
CPU  Zilog Z80
SPEED  4 MHz
RAM  64 KB (up to 128 KB)
ROM  14 KB
TEXT MODES  64 x 16 / 32 x 16 / 64 x 40 / 80 x 24
GRAPHIC MODES  None
COLORS  Monochrome green phosphore
SOUND  Built-in speaker
SIZE / WEIGHT  47.5 (W) x 52 (D) x 31 (H) cm
I/O PORTS  Tape (500 or 1500 bauds), Centronics, I/O ports compatible with Model III, Serial (4D)
BUILT IN MEDIA  One or Two 5.25'' disk-drives
OS  TRSDOS 6.0 or 1.3, LDOS, CP/M
POWER SUPPLY  Built-in power supply unit
PRICE  From $1990. In later years the price came down to about $1000
By 1990 the Model 4D was being closed out at $599


retro computing t-shirts and goodies
3D Cubes
BASIC code
Breakout
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 old-computers.com | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -