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.

Catweasel Tools Updated to v4.9

Quentin Barnes has released v4.9 of the Catweasel Tools originally written by Tim Mann. Many updates to this version were written by Tim!


  • The main new feature of this release is the -R option for cw2dmk. It provides the ability to replay a previously saved log as input to cw2dmk rather than reading from physical media. This will allow users of cw2dmk to pass along strange or unexpected media read behaviors to the maintainers as files without having to mail diskettes.
  • Catch errors when writing to files. Report and exit when errors are seen.
  • Add -X min_retry feature to cw2dmk, accepting the same syntax for min_retry as for -x max_retry.
  • Add QUIRK_IAM to -q option in cw2dmk.
  • Add QUIRK_EXTRA_DATA to -q option in cw2dmk.
  • Various minor cleanup of code and the cw2dmk usage message.

You can download from Github..