2 layers39.8 × 59.4 mm
2 layers63.3 × 57.2 mm
Ram Tester
tops4u/Ram-Tester118Ram Tester for vintage CBM Computer RAM Chips
- Size
- 63.3 × 57.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 42
- Nets
- 48
- Pads
- 161
- Tracks, vias
- 617, 60
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 14 Sep 2024
- Updated
- 4 Nov 2026
Overview
Ram Tester is an open-source printed circuit board by tops4u, from the tops4u/Ram-Tester repository on GitHub. It is a 2-layer board of 63.3 × 57.2 mm with 42 parts on 48 nets, routed with 617 tracks and 60 vias.
It is built around the ATMEGA328-PU. Its parts include 24 resistors, 6 capacitors, 3 ICs, 2 transistors and 2 connectors. It belongs with the retro computing and games boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
Schematic/SOJ_Adapter/readme.mdSOJ Aapter
This Adapter add 2 SOJ 26 Sockets which allows for testing of 514256/514400 Style RAM and 511000/411000 RAM in SOJ Packages.
It also adds 2 ZIP Sockets, one for 511000/411000 RAM in ZIP Package and the other for 41256 RAM in ZIP Package.
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 47 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R7, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24 +2 |
| 3 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C6, C7 |
| 3 | 1M | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3, R4, R5 |
| 2 | 15pF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C2, C3 |
| 2 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 1 | 0.5A | Fuse:Fuse_Littelfuse_395Series | F1 |
| 1 | 100 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C5 |
| 1 | 150 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R6 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 1 | ATmega328-P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | Conn_01x02_Pin | Connector_USB:MicroUSB PowerOnly | J1 |
| 1 | Crystal | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | ICSP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | LED_Dual_AAK | LED_THT:LED_D5.0mm-3 | D1 |
| 1 | RAM / ZIF | Package_DIP:DIP-20_W7.62mm_LongPads | U2 |
| 1 | SW_DIP_x03 | Button_Switch_THT:SW_DIP_SPSTx03_Slide_9.78x9.8mm_W7.62mm_P2.54mm | SW1 |
| 1 | SW_Push | Button_Switch_THT:SW_TH_Tactile_Omron_B3F-10xx | SW2 |
| 1 | ZIP Socket | Package_DIP:ZIP-20 | U3 |
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Questions
How big is the Ram Tester PCB?
It measures 63.3 × 57.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ram Tester use?
42 parts, built around the ATMEGA328-PU. 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 Ram Tester KiCad files?
From the tops4u/Ram-Tester repository on GitHub, at the commit this page was made from: the board is Schematic/TH/Archive/Ram_Tester.kicad_pcb and its schematic Schematic/4116/4116.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ram Tester design in my own project?
Its repository states no licence, so its author keeps all rights: ask tops4u before reusing the design.