Z80ram
About the Z80ram PCB
Z80ram is an open source PCB design by jblang, published on GitHub under the MIT license. It is a 2-layer board measuring 99.8 × 49.9 mm, with 19 components from 14 distinct parts.
Other key parts include the Z80CPU, 74HCT574, 74HCT257, AS6C4008-55PCN and 74HCT138. By type, the board carries 6 ICs, 6 capacitors, 2 connectors, 2 resistors, 1 transistor and 1 crystal.
It belongs with the retro computing and wearables designs in this gallery.
From the project
AVR-based bootloader, I/O, and debugging for Z80-based computers
z80ctrl is an AVR-based bootloader, debugger, and I/O device for a Z80 retrocomputer with the following features:
- Plug-in module for RC2014 retrocomputer replaces the clock, serial, ROM, and CF boards - Runs CP/M software directly from FAT32-formatted SD Card - Boots unmodified disk images from the AltairZ80 emulator - Monitor with file management, memory inspector, and built-in Z80 disassembler - Single-step debugging, breakpoints, and watchpoints to trace Z80 bus activity in real-time - Expandable SPI bus allows bridging other SPI peripherals to the Z80 - Flexible MIT-licensed firmware…
Main components on the Z80ram
Z80ram bill of materials (BOM)
19 components, 14 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Z80CPU | DIP-40_W15.24mm | U1 |
| 1 | 74HCT574 | DIP-20_W7.62mm | U2 |
| 1 | 74HCT257 | DIP-16_W7.62mm | U3 |
| 1 | AS6C4008-55PCN | DIP-32_W15.24mm | U4 |
| 1 | 74HCT138 | DIP-16_W7.62mm | U5 |
| 1 | DS1302+ | DIP-8_W7.62mm | U6 |
| 1 | 2N7000 | TO-92_Inline | Q1 |
| 1 | 32.768kHz | Crystal_DS26_D2.0mm_L6.0mm_Horizontal | Y1 |
| 1 | BUS | PinHeader_1x39_P2.54mm_Vertical | J1 |
| 1 | BUSEXT | PinHeader_1x23_P2.54mm_Vertical | J2 |
| 1 | BATT | BatteryHolder_Keystone_3001_1x12mm | BT1 |
| 6 | 0.1uf | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C5, C6 |
| 1 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 10K | R_Array_SIP5 | RN1 |
Z80ram design files
The KiCad project lives in the jblang/z80ctrl repository on GitHub; these links point at the commit this page was built from.
Z80ram: common questions
How big is the Z80ram PCB?
The Z80ram measures 99.8 × 49.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Z80ram?
19 components, from 14 distinct parts. The full bill of materials is listed on this page.
Where can I download the Z80ram design files?
From the jblang/z80ctrl repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Z80ram design in my own project?
Yes, under the terms of its MIT license, which jblang chose for the repository.
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