4 layers36.4 × 15 mm
Ovrdrive
o7-machinehum/phantomdrive
Seemingly normal USB drive with a hidden security feature
57 parts1kMIT
4 layers98.6 × 100 mm
Ps2 80 memory
schlae/ps2_80_memory7PS/2 Model 80 memory module clone
- Size
- 98.6 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 98
- Pads
- 646
- Tracks, vias
- 2,029, 104
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 21 Nov 2024
- Updated
- 21 Nov 2024
Overview
Ps2 80 memory is an open-source printed circuit board by schlae, from the schlae/ps2_80_memory repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 4-layer board of 98.6 × 100 mm with 57 parts on 98 nets, routed with 2,029 tracks and 104 vias.
Its parts include 26 capacitors, 26 ICs, 4 resistors and 1 connector.
README
README.mdPS/2 Model 80 1MB/2MB Memory Card Clone
IBM PS/2 Model 80 computers use a proprietary memory card instead of the more common SIMM memory modules. I've reverse engineered a 3rd party memory board that uses standard memory chips instead of the MST modules that the IBM cards use. If you can't get an original card, or if the MST modules on your card have gone bad, this project may be a good way to get your computer back up and running.
Fabrication Notes
This is a 4-layer board. The stackup is not critical and the two inner layers are just power and ground. The dimensions are 98.6 x 100mm. The thickness is the standard 0.062" (1.6mm).
Bill of Materials
| Q | Designator | Description | MFG PN | Mouser P/N |
|---|---|---|---|---|
| 1 | J1 | DIN41612_R_3x32 | HARTING 09732966801 | 617-09-73-296-6801 |
| 26 | C1 - C26 | Cap, 0.1uF 25V 0603 | (Generic) | |
| 2 | U1, U2 | 74F244 or AM2966PC | 74F244 | 595-SN74F244N |
| 16 | U3 - U18 | 256K x 4 DRAM, 80ns or faster | 44C256 | |
| 8 | U19 - U26 | 256K x 1 DRAM, 80ns or faster | 41C256 | |
| 1 | R1 | 0 ohm resistor, 0805 | ||
| 0 | R2 | DNI | ||
| 0 | R3 | DNI |
This bill of materials is for the full 2MB version of the card. For 1MB, populate as follows
| Q | Designator | Description | MFG PN | Mouser P/N |
|---|---|---|---|---|
| 1 | J1 | DIN41612_R_3x32 | HARTING 09732966801 | 617-09-73-296-6801 |
| 26 | C1 - C26 | Cap, 0.1uF 25V 0603 | (Generic) | |
| 2 | U1, U2 | 74F244 or AM2966PC | 74F244 | 595-SN74F244N |
| 8 | U3 - U10 | 256K x 4 DRAM, 80ns or faster | 44C256 | |
| 4 | U19, U21, U23, U25 | 256K x 1 DRAM, 80ns or faster | 41C256 | |
| 2 | R1, R2 | 0 ohm resistor, 0805 | ||
| 0 | R3 | DNI |
Assembly Notes
Assemble according to the bill of materials for the 1MB or 2MB version. Besides the chips, the only other difference is jumper R2, which, when placed, indicates to the computer that only 1MB is installed. You may want to omit the extra bypass capacitors if you're only installing 1MB, but for flexibility, I recommend socketing all the chips and including all the memory so it is easy to switch back and forth.
Troubleshooting
As with any accessory for the IBM PS/2 family of computers, troubleshooting involves frustration and arcane knowledge. I recommend the following resources
- IBM 8580 Common Devices - See the sections on memory
- IBM 8580 Planar Memory
The BIOS does some "intelligent" things, like swapping around blocks of memory, which can make troubleshooting difficult.
License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. See https://creativecommons.org/licenses/by-sa/4.0/.
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 0.1 | Passive:CAPC1608X100 | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23 +10 |
| 16 | 44C256 | Active:DIP254P762X635-20 | U3, U4, U5, U6, U7, U8, U9, U10, U11, U12, U13, U14, U15, U16, U17, U18 |
| 8 | 41C256 | Active:DIP254P762X635-16 | U19, U20, U21, U22, U23, U24, U25, U26 |
| 3 | DNI | Passive:RESC2012X55 | R2, R3, R4 |
| 2 | 74LS244 | Active:DIP254P762X635-20 | U1, U2 |
| 1 | 0 | Passive:RESC2012X55 | R1 |
| 1 | Conn_VME_3x32 | Connector_DIN:DIN41612_R_3x32_Female_Horizontal_THT | J1 |
Questions
How big is the Ps2 80 memory PCB?
It measures 98.6 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Ps2 80 memory use?
57 parts. 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 Ps2 80 memory KiCad files?
From the schlae/ps2_80_memory repository on GitHub, at the commit this page was made from: the board is ps2_80_memory.kicad_pcb and its schematic ps2_80_memory.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ps2 80 memory design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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