Original REX PCB

2 layer board of 0.75x1.52 inches (19.05x38.63 mm).
Shared on January 11th, 2017 18:00.

REX1

Order board. Download. Permalink. Embed order link.

QUAD V4

2 layer board of 2.02x0.72 inches (51.31x18.31 mm).
Shared on June 14th, 2016 15:24.

M100 4 Bank RAM Module Uses: 74AC02 (Quad 2 input NOR gate) (SOIC) 74AC74 (dual flip flop) (SOIC) 74AC573 (8 bit latch) (2 sizes supported) TC551001AFTL-10L (memory) (or equiv) BAV70 (pair of diodes) (SOT-23) 340k ohm 0805 resistor 2x 1uF 0805 capacitor requires machine pin headers (26 pins)

Order board. Download. Permalink. Embed order link.

M100ROM: TRS-80 Model 100 Main and Option ROM adapter

2 layer board of 0.91x1.65 inches (23.14x41.94 mm).
Shared on March 28th, 2015 14:33.

ROM adapter for M100 my Mike Stein

see

http://bitchin100.com/wiki/index.php?title=M100ROM

This is an adapter board for TRS-80 Model 100. There are three use cases-

a) Early M100 - allow user to install an updated Main ROM using a 27C256

b) Early M100 - allow user to install an updated Main ROM and an Option ROM using a 27C512

c) Late M100 - allow user to install an updated Main ROM and an Option ROM using a 27C512 (because a late M100 is compatible with 27C256)

What you need-

soldering skills and equipment!

2 x 1N4148 or similar diodes, 1 x 10k leaded resistor

28 pins for adapting the board to the socket

either a 27C256 or 27C512, properly programmed

Order board. Download. Permalink. Embed order link.

Model 100 EXTRAM

2 layer board of 0.91x1.62 inches (23.14x41.17 mm).
Shared on February 15th, 2015 12:25.

internal EXTRAM module, replacing the Main ROM with an EEPROM + SRAM combo.

Order board. Download. Permalink. Embed order link.