4 layers24.4 × 24.4 mm
OSO SWAT C1-rounded
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
36 parts2.1k
4 layers92 × 54.3 mm
Compaq (197005-001) cache module - open source reproduction
- Size
- 92 × 54.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 102
- Pads
- 497
- Tracks, vias
- 1,866, 170
- Pours
- 820
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 28 Aug 2024
- Updated
- 16 Aug 2025
Overview
Sram is an open-source printed circuit board by wichers, from the wichers/Compaq-Cache-Module-197005-001 repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 92 × 54.3 mm with 36 parts on 102 nets, routed with 1,866 tracks and 170 vias.
It is built around the IS61C1024AL-12JLI and DSIC04TSGET. Its parts include 14 capacitors, 12 ICs, 3 resistors, 1 connector and 1 switch.
Main components
2README
README.mdCompaq 197005-001 Cache Module reproduction
Reverse Engineered non standard 256KB/1MB L2 Cache Module for use in:
- Compaq ProLinea 4/66 (164560-001)
- Compaq Presario 833CDS/850/850CDS/860CDS/866 (197023-001)
- Compaq Presario 700-900 series
Resources
Original 128KB module front 
, back 
This project was possible with help provided by rasz_pl - creator of the - FIC-486-GAC-2 Cache Module reproduction. Huge thank you for inspiration and taking time to review.
VESA VLB slot pinout VESA VLB slot dimensions
Progress report
16/8/2025: Added switch to set memory size
31/8/2024: Added support for switchable 256KB/1MB
28/8/2024: First version up for testing.
23/8/2024: Project start. Figuring out the pinout and matching to datasheet.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 1uF 16V | Capacitor_SMD:C_0805_2012Metric | C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 10 | IS61C1024AL-12JLI | others:SOJ-32_L21.0-W7.6-P1.27-LS8.5-BL | U1, U2, U3, U4, U5, U6, U7, U8, U9, U10 |
| 4 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1mm | FID1, FID2, FID3, FID4 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3 |
| 2 | 47uF 16V | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2 |
| 2 | SN74AHCT244DWR | others:SOIC-20_L12.8-W7.5-P1.27-LS10.3-BL | U11, U12 |
| 1 | Cache_slot | others:Cache slot | J1 |
| 1 | DSIC04TSGET | others:SW-SMD_8P-L11.1-W6.2-P2.54-LS9.8 | SW1 |
| 1 | MountingHole | MountingHole:MountingHole_4mm | H1 |
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Questions
How big is the Sram PCB?
It measures 92 × 54.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Sram use?
36 parts, built around the IS61C1024AL-12JLI and DSIC04TSGET. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sram KiCad files?
From the wichers/Compaq-Cache-Module-197005-001 repository on GitHub, at the commit this page was made from: the board is sram.kicad_pcb and its schematic sram.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sram design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).