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Commodore VIC-20 8KB RAM Expansion

BrettHallen·Commodore_VIC20·Internal_8KB_New/KiCad/VIC-20_Internal_8KB_RAM.kicad_pcb

Commodore VIC-20 8KB RAM Expansion PCB layout, top view — open source board by BrettHallen
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About the Commodore VIC-20 8KB RAM Expansion PCB

Commodore VIC-20 8KB RAM Expansion is an open source PCB design by BrettHallen, published on GitHub. It is a 2-layer board measuring 62.9 × 61.6 mm, with 15 components from 11 distinct parts.

Other key parts include the 74HCT04, 74HCT138, 74HCT30, 74HCT157 and 6264 SRAM. By type, the board carries 5 ICs, 5 capacitors, 4 connectors and 1 resistor.

It belongs with the retro computing designs in this gallery.

From the project

Hardware & information for the VIC-20

The first step is to create this breakout board to isolate the A/V signals from the video output stage on the VIC's motherboard.

I hope that it will allow me to see what signals the 6560 outputs natively, then start to build on that.

BTW, yes I know there are boards out there that already do this. I've not had much luck with the free or paid-for boards, so I want to ... TRY TO ... understand it myself. Let's see ...

Commodore VIC-20 8KB RAM Expansion, from the project README
From the project README

Main components on the Commodore VIC-20 8KB RAM Expansion

74HCT0474HCT13874HCT3074HCT1576264 SRAM

Commodore VIC-20 8KB RAM Expansion bill of materials (BOM)

15 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74HCT04
U1
1
74HCT138
U2
1
74HCT30
U3
1
74HCT157
U4
1
6264 SRAM
U5
1
RAM Decoder
J1
1
UD4
J2
1
UE4
J3
1
+3KB
J4
5
100NF
100nF
C1, C2, C3, C4, C5
1
10KΩ
R1

Commodore VIC-20 8KB RAM Expansion design files

The KiCad project lives in the BrettHallen/Commodore_VIC20 repository on GitHub; these links point at the commit this page was built from.

Commodore VIC-20 8KB RAM Expansion: common questions

How big is the Commodore VIC-20 8KB RAM Expansion PCB?

The Commodore VIC-20 8KB RAM Expansion measures 62.9 × 61.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Commodore VIC-20 8KB RAM Expansion?

15 components, from 11 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Commodore VIC-20 8KB RAM Expansion design files?

From the BrettHallen/Commodore_VIC20 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Commodore VIC-20 8KB RAM Expansion design in my own project?

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

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