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REXCPM UPS 100

bkw777·REXCPM_UPS·PCB/REXCPM_UPS_100.kicad_pcb

REXCPM UPS 100 PCB layout, top view — open source board by bkw777

About the REXCPM UPS 100 PCB

REXCPM UPS 100 is an open source PCB design by bkw777, published on GitHub under the Custom license license. It is a 2-layer board measuring 51.3 × 18.3 mm, with 9 components from 6 distinct parts.

Other key parts include the 2G02. By type, the board carries 4 battery holders, 2 connectors, 1 IC, 1 diode and 1 capacitor.

It belongs with the power & battery designs in this gallery.

From the project

Replacement system bus interface board for REXCPM with on-board batteries.

System bus interface board for REXCPM with on-board batteries.

Provides an on-board battery to preserve the contents of the REXCPM while not installed in a computer, or after the computers memory battery dies, or when the memory power switch is turned off. Allows using REXCPM on model 102 without modifying the computer.

REXCPM is a purely volatile SRAM device, which acts like all 3 of RAM, ROM, and DISK. It holds a lot of virtual firmware, rom images, ram image backups, live/working ram, and a disk image for CP/M which holds up to 4 MB of your programs and data, all only in volatile ram.

REXCPM UPS 100, from the project README
From the project README

Main components on the REXCPM UPS 100

2G02

REXCPM UPS 100 bill of materials (BOM)

9 components, 6 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
2G02
U1
1
Model_100_System_BUS
J1
1
SM04B
J2
4
Keystone_3031
BT1, BT2, BT3, BT4
1
BAV170
D1
1
1276-1026-1
1u
C1

REXCPM UPS 100 design files

The KiCad project lives in the bkw777/REXCPM_UPS repository on GitHub; these links point at the commit this page was built from.

REXCPM UPS 100: common questions

How big is the REXCPM UPS 100 PCB?

The REXCPM UPS 100 measures 51.3 × 18.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the REXCPM UPS 100?

9 components, from 6 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the REXCPM UPS 100 design files?

From the bkw777/REXCPM_UPS repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the REXCPM UPS 100 design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

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