HardLabs

Mmu

atarola·compy6502·kicad/mmu/mmu.kicad_pcb

Mmu PCB layout, top view — open source board by atarola

About the Mmu PCB

Mmu is an open source PCB design by atarola, published on GitHub. It is a 2-layer board measuring 102.5 × 30 mm, with 22 components from 7 distinct parts.

Other key parts include the 74LS682 and 74LS139. By type, the board carries 8 diodes, 8 resistors, 3 capacitors, 2 ICs and 1 connector.

It belongs with the retro computing designs in this gallery.

From the project

Code for my 6502 build

compy6502 is an early-stage 6502 homebrew computer project. The long-term goal is to build enough hardware and firmware to run Tetris on the machine.

The design follows the spirit of Ben Eater-style breadboard/modular 6502 systems for simplicity and debuggability, but uses a different memory map based on the MMU/address-decoder architecture in docs/mmu.png.

The repo currently includes KiCad hardware designs, early ROM bring-up firmware, build/write scripts, emulator test scaffolding, and architecture reference images in docs/.

Main components on the Mmu

74LS68274LS139

Mmu bill of materials (BOM)

22 components, 7 distinct parts.

QtyPartRefs
1
74LS682
U1
1
74LS139
U2
1
Board Connector
J1
8
LED_Small
D1, D2, D3, D4, D5, D6, D7, D8
2
0.1u
C1, C2
1
10u
C3
8
4k7
R1, R2, R3, R4, R5, R6, R7, R8

Mmu design files

The KiCad project lives in the atarola/compy6502 repository on GitHub; these links point at the commit this page was built from.

Mmu: common questions

How big is the Mmu PCB?

The Mmu measures 102.5 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mmu?

22 components, from 7 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mmu design files?

From the atarola/compy6502 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mmu design in my own project?

The repository has no license, so all rights stay with atarola. Use it as a reference, and ask the author before reusing the design.

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