Rc z80ram
About the Rc z80ram PCB
Rc z80ram is an open source PCB design by PickledDog, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 99.1 × 49.9 mm, with 18 components from 15 distinct parts.
Other key parts include the Z84C0008, AS6C1008, DS1233-5 and CD74HC4017. By type, the board carries 5 jumpers, 5 capacitors, 4 ICs, 2 connectors, 1 crystal and 1 resistor.
It belongs with the retro computing designs in this gallery.
From the project
CPU+RAM+Clock+Reset for RC2014
The clocks only have a 50% duty cycle for /1 and /2 divisors - the others vary by divisor (so /3 is 33% duty, etc). This is tolerated by the Z80 SIO chip (which is the only device this board is intended to clock).
The specified parts are just the ones I used, and can be substituted as needed - Mouser links provided for convenience and reference. If you wish to socket the oscillator, I strongly recommend using a turned-pin oscillator socket, like this one. Not only do these already have the unused pins removed, they grip the oscillator much better (the limited friction of only 4 pins makes…
Main components on the Rc z80ram
Rc z80ram bill of materials (BOM)
18 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Z84C0008 | DIP-40_W15.24mm_LongPads | U1 |
| 1 | AS6C1008 | DIP-32_W15.24mm_LongPads | U2 |
| 1 | DS1233-5 | TO-92 | U3 |
| 1 | CD74HC4017 | DIP-16_W7.62mm_LongPads | U4 |
| 1 | 7.3728MHz | Oscillator_DIP-8 | X1 |
| 1 | RC2014 | PinHeader_1x39_P2.54mm_Vertical | J1 |
| 1 | RC2014_Enh | PinHeader_1x10_P2.54mm_Vertical | J2 |
| 1 | RAM En | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | RAM Paged | PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | CLK En | PinHeader_1x02_P2.54mm_Vertical | JP3 |
| 1 | CLK2 Sel | PinHeader_1x03_P2.54mm_Vertical | JP4 |
| 1 | Ratio | PinHeader_2x05_P2.54mm_Vertical | JP5 |
| 4 | 0.1uF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4 |
| 1 | 1nF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C5 |
| 1 | 10K | R_Array_SIP5 | RN1 |
Rc z80ram design files
The KiCad project lives in the PickledDog/rc-z80ram repository on GitHub; these links point at the commit this page was built from.
- Layoutrc-z80ram.kicad_pcb
Rc z80ram: common questions
How big is the Rc z80ram PCB?
The Rc z80ram measures 99.1 × 49.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Rc z80ram?
18 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Rc z80ram design files?
From the PickledDog/rc-z80ram repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Rc z80ram design in my own project?
Yes, under the terms of its Apache-2.0 license, which PickledDog chose for the repository.
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