TRS80GP v2.4.8 Released

TRS80GP has been updated to v2.4.8. Release Notes:

New Features:

  • MC-10 Emulation
  • Memory access breakpoints for 6800, 6803, 6809 and 68000 processors.
  • Bus trace for 6800, 6803 and 6809 processors.
  • Debug -> Symbol Table to view all symbols from loaded .bds files.


  • Unbreak -m4b and -m4c as they were not removing wait states.
  • Help in MacOS menu now opens the trs80gp manual.
  • Turbo turns off Haste mode and vice versa.
  • Cassette image can be ejected and shows currently loaded file in menu.
  • Ctrl-A now selects all text in the printer window on Windows.
  • Removed spurious FreHD menu from DT-1, Videotex, Electric Crayon and MX-70.

Visit the TRS80GP Web Page for the download and information, or here for the emulator.

June 2022 Issue of TRS8Bit Released

Dusty has released the June 2022 issue of the TRS8Bit newsletter. Here’s what he had to say:

In this issue, Egoitz Campo sends details of the recent Basque Tournament. A brief history of computer storage by Anna and her Dad, supplied by Kelly Ackford. George Phillips sends a one-liner optical illusion. Jay Newirth shows just what and where M3/M4 case screws live. Microcore Labs report on their MCLZ8 emulator. Ian Mavric gives a fully detailed account on repairing the M1 cassette I/F. Paul Thomas Metcalf III has a super upgrade for his M1, using a Gotek. Harold Finch stretches our minds and even I have a go too! There’s an update on the SVI-CAS. E.T. Fonehume sends a VERY addictive one-liner. Don’t believe me? Just try only playing it once! One of Lewis Rosenfelder’s super-help programs features in Assembler Bytes Back. How’s your 2022 Competition entry coming along? You’ve got to be in it to win it! There’s details of an EPROM programmer for the M1/Video Genie. A few of the recent U.K. Ebay bargains and finally, Kevin Parker sets about re-capping a Model 2 in his big Tandy’series.

You can view the table of contents here and the issue can be downloaded from Dusty’s web site.

Model I for Sale for Local Pickup, New Hyde Park, NY

Update: Claimed!

A site visitor has a Model I to sell to a good home for local pickup only (as Model I’s tend to shatter when shipped). Local pickup would be New Hyde Park, NY (right off lakeville road and Union tpk).

Includes Model I with lowercase chip with descenders, and the Homes speed up with a Z80B, expansion interface, rs-232 card, Orch-85 clone, 4 disk drives, and various manuals.

Those interested please reach out to kensperling @ gmail . com

CW2DMK, MxZVM, and Bill Vermillion

Z-80 Replacement for the Model III

Ted over at Microcore Labs has been developing a modern Z-80, which he calls MCLZ8, which can plug directly into a Model III.

MCLZ8, is a Zilog Z80 emulator which can be used as a drop-in replacement for the original Z80. It uses a Teensy 4.1 microcontroller board which contains an 800Mhz microcontroller and a small PCB to perform the voltage translation between the motherboard and the microcontroller. The MCLZ8’s Z80 emulation passes the exhaustive ZEXALL opcode test suite and the speedy microcontroller allows the ability to simultaneously mimic the Z80’s local bus interface.

You can read about his project here.

Some videos of the MCLZ8 in action are here.