Site Updates Since the Last

  1. Created a page with the official Model III/4 ROM Checksums
  2. Added the Network 4 Ports to the Ports and I/o Device page
  3. Added DASM Z-80 Disassembler v1.02 to the Misc Utilities page. DASM is a 2015 Windows program to disassemble Z-80 CMD and HEX files. It supports MAP, EQU, and Screen files to make the disassembly clearer.
  4. Information about the missing v1.1 Model I ROM has been added to the Model I ROM Version Comparison Page.
  5. The Network 4 Transporter ROM has been disassembled and commented.

June 2020 Issue of TRS8Bit

Dusty has released the March 2020 issue of the TRS8Bit newsletter.

In this issue, Tezza sorts out Model 4 disk drive re-alignment. Ian Mavric gives us the lowdown on the M1’s different keypads. There’s a TRS-Xenix information sheet from Peter Cetinski. Rence shows us a truly portable model 1 complete with 7″ TFT monitor! ET Fonehume has a one-liner to produce Armstrong numbers. Do you know the Differences between the AZERTY and QWERTY keyboards? Harold Finch set us another of his puzzles. There’s a selection of articles ‘from the day’. Did you miss the ebay.co.uk bargains from the last 3 months? Tim Halloran details the Model 1 No-chip VBLANK modification. John Corbani’s original spreadsheet, MINICALC, is upgraded to the AFT. Ian Mavric is Revisiting the CN80 Model 4 mouse project (part 4). Full details of the “double-do” 2020 COMPETITION. Kyle Wadsten has produced a track/sector display using a M3 clock. Details of the USB FC5025 floppy controller and finally, Ian Mavric suggests some complex upgrade projects.

It can be downloaded from his web site.

TRS80GP v2.3.1 Released

TRS80GP has been updated to v2.3.1. Changelog:

  • Alpha joystick emulation on Windows.
  • Software keyboard for Mac.
  • PCG-80, 80-Grafix, 80-Grafix+ and 80-Grafix III programmable character graphics.
  • Z-80 debugger can set ranged breakpoints on memory read/write and I/O in/out.
  • Floppy and hard drive sector viewer.
  • Memory and disk search capability (in Z-80 debugger and Disk Viewer).
  • Alt-0 though Alt-9 are user-definable keyboard macros (Edit menu) [windows].
  • Floppy command delay added; Sledge of Rahmul and other Duo-Loader games boot.
  • Return floppy sector type fixing Zork boot and improved write protect handling.
  • Right-shift on Model 1 logical keyboard working again.
  • Hard drive emulation supports WD2010 mode with up to 2048 cylinders.
  • JV3 format floppies with more than 40 tracks work now.
  • Now have warm and cold restart with the latter re-initializing RAM.
  • Xenix printing much faster as Model 2/16 emulation generates printer interrupts.
  • Model 1/3/4 logical keyboard now maps ‘^’ to ‘[‘. This may help someone who’s entering BASIC from a listing that shows ‘^’ for exponentiation.
  • Add Backslash as CLEAR in logical mode (not just physical); better for Macs.
  • Micro Matrix Photopoint light pen emulation for Model 1,3,4 (-lp) [windows].
  • Load custom character generator ROM with -charrom
  • Add -l file to load but not execute a file on the command line.
  • Add -ls file, Load Symbols… to load only the symbols from a BDS file.
  • Model 2 etc. hires displays properly CRTC start address changes (e.g., when Xenix scrolls)
  • Model 4 LS-DOS now has drives 0,1,2,3 instead of 0,1,3,4
  • Fixed occasional character drop when pasting large amounts of text.
  • Only show gray bars above and below Model 4’s 64 column mode in beam debug.
  • Add -tsr flag for laughs. Or rename your executable to tsr80gp.exe

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

SDLTRS Updated to v1.2.10


Jens Guenther has updated his forked SDLTRS to v1.2.10.

Per Jens, this version runs on BSD, Haiku, Linux, MacOS(X), Solaris and Windows (95 to current).

  • Added Z80 refresh register. (v1.2.10)
  • Added more accurate Z80 block moves. (v1.2.10)
  • Added support for Sprinter II/III. (v1.2.10)
  • Fixed bugs and other improvements. (v1.2.10)

You can download a ZIP file with the full source and all executables here.

Joystick Adapter for Model I

Pascal Holdry has reverse engineered the Model I Joystick Adapter which can be plugged directly into the output bus of the TRS-80 Model I via a 40 pin cable.

He advises it works with all games, via jumper select (Big 5 games need to be jumpered differently)

For more information visit his site. Note: There is a translation pulldown at the top of the right menu.

SDLTRS II Updated to v1.2.9



Site visitor lowen has let me know that Jens Guenther has updated his forked SDLTRS to v1.2.9.

Per Jens, this version runs on BSD, Haiku, Linux, MacOS(X), Solaris and Windows (95 to current).

Some of the updates include:

  • Fixed SDL2 regressions in version 1.2.8.
  • Added display of Z80 speed in window title bar.
  • Added “Turbo Paste” function.
  • Adjust Z80 clock rate on the fly.
  • Fixed bugs and other improvements.