HardLabs

Commodore VIC-20 32KB RAM Expansion

BrettHallen·Commodore_VIC20·Internal_32KB/KiCad/VIC-20_Internal_32KB_RAM.kicad_pcb

Commodore VIC-20 32KB RAM Expansion PCB layout, top view — open source board by BrettHallen

About the Commodore VIC-20 32KB RAM Expansion PCB

Commodore VIC-20 32KB RAM Expansion is an open source PCB design by BrettHallen, published on GitHub. It is a 2-layer board measuring 63.9 × 61.6 mm, with 12 components from 10 distinct parts.

Other key parts include the ATF16V8, 74HCT138 and 62256. By type, the board carries 5 connectors, 3 ICs, 3 capacitors and 1 resistor.

It belongs with the retro computing designs in this gallery.

From the project

Hardware & information for the VIC-20

Requires two DIP-16 breakout boards to replace the 74LS138 decoders.

The daughterboard is designed to plug in to the VIC's motherboard where two of the original 2114 chips were located - expectation is that all ten 2114 chips are removed, and two replaced with an IC socket.

The two 74LS138 decoders on the VIC motherboard are also removed and replaced with breakouts so the signals can be handled on the expansion daughterboard.

Main components on the Commodore VIC-20 32KB RAM Expansion

ATF16V874HCT13862256

Commodore VIC-20 32KB RAM Expansion bill of materials (BOM)

12 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATF16V8
U1
1
74HCT138
U2
1
62256
U3
1
UD4
J1
1
UE4
J2
1
RAM Decoder
J3
1
BLK Decoder
J4
1
Disable/Enable Switch
J5
3
100NF
100nF
C1, C2, C3
1
10KΩ
R1

Commodore VIC-20 32KB 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 32KB RAM Expansion: common questions

How big is the Commodore VIC-20 32KB RAM Expansion PCB?

The Commodore VIC-20 32KB RAM Expansion measures 63.9 × 61.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Commodore VIC-20 32KB RAM Expansion?

12 components, from 10 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 32KB 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 32KB 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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