2 layers370.8 × 298.5 mm
8 Bit Computer
The-Invent0r/8-bit-Computer-PCB
These are the KiCAD files for my 8-Bit Computer.
323 parts142
2 layers
Comal80
acarmony1/comal8011COMAL 80 for C64
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 55
- Pads
- 191
- Tracks, vias
- 664, 35
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Jan 2021
- Updated
- 25 May 2021
Overview
Comal80 is an open-source printed circuit board by acarmony1, from the acarmony1/comal80 repository on GitHub. It is a 2-layer board with 16 parts on 55 nets, routed with 664 tracks and 35 vias.
It is built around the 74LS139PC, 74LS161DC and 74LS86. Its parts include 7 capacitors and 6 ICs.
Main components
3
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
74LS86
DIP-14-20℃~+75℃ 10mA 2.7V 23ns@5V,15pF 2V 400mV 400uA 5V 74LS 800mV 8mA XOR Gate DIP-14 Logic Gates ROHSHITLogic Gates
README
C64/README.mdcomal80
COMAL 80 for C64
In December of 2020 I was asked by KEN SIMMONS to create a comal-80 cartridge, for the Commodore 64, from an old COMAL TODAY magazine schematic. The COMAL80 cartridge uses unique 'bankswithcing' to switch up to 96KB of ROM.
This project is a result of that task.
The board is a simple 2 layer design, with (3) 27C256 EPROMS, and (3) logic devices (74LS86, 74LS161, 74LS139), others may be substitued but are not known at this time.
The gerber files for creating a PCB are located in the gerbers directory. The bin files for U1 and U2 are located in the bin folder. U3 is left empty, and is used for personal spece (if needed) for user applications. There is a 'superchip' that existed to allow for expansion of the COMAL 80 system, however I cannot locate this bin currently.
1-18-2021 GutHub creation and release of V1. Design is known working and completed. No known issues or releases planned.
1-19-2021 C64/C128 folders added. C128 Comal Cartridge schematic added.
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 0.1uF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7 |
| 3 | AT27C256R-150PU | Package_DIP:DIP-28_W15.24mm_Socket | U1, U2, U3 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm_Socket | U6 |
| 1 | 74LS161 | Package_DIP:DIP-16_W7.62mm_Socket | U5 |
| 1 | 74LS86 | Package_DIP:DIP-14_W7.62mm_Socket | U4 |
| 1 | C64-Exp-Port | OpenC64Cart16K:C64-Cart | EDGE1 |
| 1 | LOGO | logos:cbm_logo.kicad_530 | G*** |
| 1 | Peg_Hole | MountingHole:MountingHole_5mm_Pad | H1 |
Questions
What parts does the Comal80 use?
16 parts, built around the 74LS139PC, 74LS161DC and 74LS86. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Comal80 KiCad files?
From the acarmony1/comal80 repository on GitHub, at the commit this page was made from: the board is C64/comal-80.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Comal80 design in my own project?
Its repository states no licence, so its author keeps all rights: ask acarmony1 before reusing the design.
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