Using a Composite Monitor In Lieu of a Model I Monitor

The TRS-80 was originally sold with a 13″ RCA Black and White Television with most of the guts ripped out. However, there can be times that a monitor is not available, you can build this cable to connect your Model I to a composite monitor. For instructions, visit here.

Building a Replacement Model I Power Supply

It is very common today for people to have Model I power supply issues. While common wisdom says to cut open non-working supplies and check/replace the fuse, sometimes that is not possible, that is not the problem, or the individual is missing a supply altogether. Fortunately, two individuals have prepared schematics and instructions on building a replacement power supply using current-day easy-to-find parts.
1) Charles – For instructions, download this PDF. Note: This design has parts which are easier to procure within the USA.
2) Dean Bear – For instructions, visit here.

Add New Functionality – the M.I.S.E.

The MISE (Model I System Expander) is an add-on device for the vintage Radio Shack TRS-80 Model I microcomputer. It connects to the buffered expansion port on the Expansion Interface or directly to the Model I keyboard, and provides these benefits.

  • Direct-booting solid state hard disks on Compact Flash, with LDOS-5.3.1 preloaded. No boot floppy or ROM modification is required.
  • Alpha Products Newclock-80 compatible real-time clock/calendar with battery backup.
  • SVGA display output for an 800×600 @ 60Hz monitor, no software required.
  • ROM extension including drivers for the hard disks, real-time-clock, and double-density floppy adapter. No drivers needed.
  • Joystick port for Atari 2600 compatible joysticks.

The home site for the M.I.S.E. can be found at http://home.comcast.net/~bartlett.p/MISE/.

Case for Expansion Interface

If you have an Expansion Interface but no case, Andrew Quinn has created this perspex “case”, which he advises is strong enough to support the monitor.

Drilling instructions can be found here.

1 Comments

  1. Hi,
    Could you please pass on my name and Email address as someone who repairs TRS80 Model I equipment. I also have experience connecting and using a HxC2001 floppy emulator with the Model I’s. I also refurbish and sell Model I’s on EBay under the seller ID FFEJ1457. You can add that so people can check my feedback rating.

    Thanks,
    Jeff

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