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- TRS-80 Hardware Modifications – Model I
This modification adapts the TRS 80 model I for CP M by: Remapping memory so that RAM commences at 0000H Adding a jump to zero reset switch Component List 1 x 74LS04 hex inverter; 1 x 74LS367 hex tri-state bus driver; 1 x 1 M resistor; 1 x 0 022uF capacitor; 1 x SPST toggle switch; 1 x push button (N O ) PCB or Veroboard; MEMORY REMAPPING
- The Holmes Sprinter - TRS-80
Running the Sprinter I at the fastest speed possible (5 32 MHz) meant that some additional modifications needed to be made to the Model I The fastest speed required replacing the default Z80 with a faster Z80B processor (which had to be purchased separately) Running reliably at the fastest speed also required fast memory
- TRS-80 model upgrades - Vintage Computer Federation Forums
For the Model 1, you will need an Expansion interface to be able to get the Floppy Drive(s) working The Expansion interface also requires a Power Supply (same type as Model 1) Larry KA0DMJ
- The Right Stuff - the TRS-80 Oldtimer Centre
SEPTEMBER 2019: I talk about what I'll be doing at Tandy Assembly 2019, introduce a new Speed Up modification for the Model I "Sprinter", and I have a look back at the Norcom TC-III, which was a Model III upgrade for the Model I
- Retro Fix: A Purgatory of TRS-80 Model 1 Repairs
Upgrading your TRS-80 to meet growing needs can be done by means of the expansion interface This device contains sockets for an additional 16K or 32K RAM and a disk controller for up to four mini-disks (therefore more storage memory according to the need) Software-selectable dual cassettes can be used
- System 80 - Common Modifications - Classic Computers
Other modifications included a 32 64 column "select in software feature (ala TRS80 model 1)" This provided the 32 column mode with the character double width, similar to that that the "video cut" button at the back provided
- RetroStack TRS-80-Model-I - GitHub
Central repository for all TRS-80 Model 1 projects on RetroStack Power Supply (Deprecated) - Other design, but new design above is favored Related Projects Mini Amplifier - A mini amplifier often sold with a Model 1 Can be connected to the cassette port as speaker for some games
- TRS-80 Speed-Up Boards – Ira Goldklangs TRS-80 Revived Site
The TRS-80 Model I runs at 1 77Mhz, the Model III at 2 03Mhz, and the Model 4 at 4Mhz These speeds were limited mainly by the Z-80 and the speed of RAM, and were not fast enough to do certain things such as use 8″ drives or use 5 voices on an ORCH-85 90, in addition to being just painfully slow in general Note: The ORCH-85 software offers
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