Shared Projects

https://bitchin100.com/wiki/index.php?title=5MHZ_upgrade_for_Model_T

Fix your Commodore 1541 disk drive

Power supply designed to be a drop-in replacement for the GameBoy Color (GBC) power supply.

The weeCee is perhaps the smallest MSDOS gaming PC ever made that doesn’t use emulation.

It is based around an ICOP Vortex86 CPU module, which is a pentium-class x86-compatible embedded system-on-module that is intended for industrial control. However the module also works great for DOS gaming, as it includes a highly-compatible VGA graphics chip.

To this I also added a Soundblaster Pro-compatible sound chip from Crystal Semiconductor, which is still available new-old-stock from utsource, and a gameport-compatible connector for using joysticks and gamepads.

It can also support internal waveblaster MIDI expansions such as the Dreamblaster S2, or external MIDI sound modules like the MT32 and Sound Canvas.

It also includes network support for multiplayer games, as well as a USB connector for mass storage devices.

Enclosure will require a Hammond 1457J1201 case, as well as the end-plates gerbers included in the zip file below.

Source files are available in Circuitmaker’s cloud storage : https://circuitmaker.com/Projects/Details/rasteri/weeCee

HIDman is an open source device to allow the use of modern USB keyboards and mice on legacy PCs.

Peripherals that support legacy PCs are becoming hard to find, especially for the very first PCs. This project aims to provide a simple cheap solution that will cover everything from the original IBM 5150 PC all the way up to modern computers that have PS/2 ports.

You will also need to order the Front enclosure plate : https://www.pcbway.com/project/shareproject/Front_enclosure_plate_for_HIDman_0aec2ae9.html

And the Rear enclosure plate : https://www.pcbway.com/project/shareproject/Rear_Enclosure_for_HIDman_c0ff0b8a.html

Grab the rest of the case from here : https://lincolnbinns.com/e-case-a-black-40mm.html

Don’t forget 8x screws : https://lincolnbinns.com/e-case-screws.html (I suggest the thread former ones)

You can find ps/2 cables, serial cables, etc from ebay or aliexpress.

Teensy-based External Storage

Programming adapter to program M4ROM_TANDY and M4ROM_27256 .

Solid electrical contact with the center pins is made the fact that the receptacle holes in the center of the M4ROM boards are slightly closer together than the pins on the programming adapter.

One pair of the 2.0mm pitch pins on top needs to be cut from a 2x7 header to form the polarity key.

Don’t try to use flush cutters for that, the plastic will shatter and you’ll be left with loose/bare pins.

A hobby knife on a cutting board works better, with a paper towel laid over the header to keep the small part from flying away.

Provides 4 virtual 32K EPROM from a single 128K flash chip, in a Molex 78802 form factor to fit in a Molex 78805 socket.

The pinout at the castellated edge contacts is the non-standard pinout for the TRS-80 / TANDY Models 100, 102, and 200.

NOT for EPSON PX-4, PX-8, TANDY 600, Kyotronic KC-85, Allen-Bradley PLCs, Intermec or Telexon hand terminals, or anything else that has a Molex 78805 socket with a standard pinout. For those, see M4ROM_27256

The chip is written and re-writable using this programming adapter common to both M4ROM_TANDY and M4ROM_27256.

Carrier: http://shpws.me/SGGB

Requires an SOIC-28 test clip for programming.

This is ONLY for TRS-80 Model 100, 102, or 200, because of the non-standard pinout.

For other applications that use the same socket but with a standard pinout (TANDY 600, Epson PX-8, PX-4, etc), see the “Meeprom” version from the same git repo if you want an electrically re-writable module, or just use a plain 27C256 on the standard DIP-28 version of the carrier.

Assembly notes:

For battery holders BT1, BT2, BT3 (NOT BT4!) break the rear walls off before soldering, so that a battery can pass all the way through the holder. Flush-cut everything on the top side as close as possible, and re-flow the cut posts to smooth them into domes. Optionally solder 2 short bits of wire from the two exposed vias to the rear walls of BT4 to mechanically strengthen those walls. Solder a 25mm piece of 0.6mm solid core insulated wire to the GND side of the big yellow capacitor on the REXCPM.

Qwiic adapter wire connections:

BLACK -> new GND pin on the large yellow cap

RED -> pin closest to the cap

BLUE -> center pin

YELLOW -> pin furthest away from the cap

8K RAM module for “Model T” computers.

How to do the legs.

https://gist.github.com/bkw777/52d85d89eeff8445cc667685d05ea94d

Don’t use square pins. They are too fat and they damage leaf-style sockets. Even standard machined round pins are a bit too thick technically.

Writable replacement for main rom in TANDY 102, TANDY 200, NEC PC-8201, Olivetti M10, Kyotronic KC-85

http://tandy.wiki/FlexROM_102

Optional breakout send/return for /CS line, for use with REX_Classic Main ROM Management Feature

This version is NOT for TRS-80 Model 100 !

For Model 100, use https://www.pcbway.com/project/shareproject/FlexROM_100.html

How to do the legs

To program the chip, just place the board directly into a programmer and set the two smaller jumpers.

(Does not require a programming adapter. The jumpers change the pinout to match the IC, so the board is it’s own programming adapter.)

You can find rom images at http://tandy.wiki/Model_T_Y2K

BOM verified by John Hutchison 2025.1.15 https://www.digikey.com/en/mylists/list/5FEBN35SNT

This is an adapter board for the STLINK-V3PWR programmer to break out the 1.27 mm pin pitch to standard 0.025 inch square pins on 0.1 inch centers. You will need a cable from Samtec like their FFSD-07-D-06.00-01-N.