TRS-80 Expansion Interface 26-1140

The TRS-80 Expansion Interface (catalog number 26-1140) is the basic model, shipping with no additional RAM installed. Two other variants were also sold with catalog numbers 26-1141 and 26-1142, containing 16K and 32K or RAM respectively.

In addition to allowing extra RAM to be fitted to a TRS-80, the Expansion Interface also provides:

  • DIN jacks for two cassette records
  • Line printer card-edge for connection to Radio Shack Line Printers and other suitable parallel interface printers
  • Min-Disk card-edge for connection of up to four Radio-Shack Mini-Disk Drives
  • Expansion board card edge for use with the RS-232C Interface (or other custom designed PCB)
  • Bus card edge, which duplicates the signals present at the TRS-80 card edge.

In addition to these connections, the Expansion Interface provides a 25mS heartbeat interrupt to the computer (RTC).

The Expansion Interface is not compatible with a Level I TRS-80, only Level II.

Date : Unknown

Manufacturer : Tandy

Physical Description : TRS-80 interface sn-077756 outer box 5 foam incerts 1 ribbon 4 plastic clip on covers 5 pin - 5 pin male din cable Cassette interface cable expansion interface booklet level 2 basic ref manual back page to basic ref manual (loose from booklet) TRS-80 ref handbook service manual space warp games booklet SCRIPSIT training program book notes for NEWDOS booklet documents for NEWDOS booklet

This exhibit has a reference ID of CH40487. Please quote this reference ID in any communication with the Centre for Computing History.
 

Scan of Document: TRS-80 Expansion Interface 26-1140

Click on the Image For Detail






Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum