2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers127 × 69.9 mm
Project for capturing vintage, classic, aka old computer schematics in KiCad.
- Size
- 127 × 69.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 83
- Pads
- 282
- Tracks, vias
- 749, 62
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 26 Apr 2019
- Updated
- 24 Jun 2026
Overview
Ezcgi is an open-source printed circuit board by baldengineer, from the baldengineer/bit-preserve repository on GitHub. It is a 2-layer board of 127 × 69.9 mm with 34 parts on 83 nets, routed with 749 tracks and 62 vias.
It is built around the SN74LS00N, C315C104M5U5TA and ECE-A1EKS100B, with the K330J15C0GF5TL2, CF14JT33R0 and PRPC002SAAN-RC among its other parts. Its parts include 14 capacitors, 10 ICs, 3 resistors, 3 connectors and 1 transistor. It belongs with the retro computing and games boards of this library.
Main components
10
SN74LS00N
PDIP-140℃~+70℃ 15ns@5V,15pF 2 2.5V 2V 4 4.75V~5.25V 400uA 500mV 74LS Series 800mV 8mA NAND Gate PDIP-14 Logic Gates ROHSTexas InstrumentsLogic Gates
C315C104M5U5TA
插件100nF 50V Z5U ±20% Plugin Multilayer Ceramic Capacitors MLCC - Leaded ROHSKEMETMultilayer Ceramic Capacitors MLCC - LeadedECE-A1EKS100B
插件,D5xL5mm-40℃~+85℃ 1000hrs@85℃ 10uF 25V 28mA@120Hz 5mm 5mm 5mm ±20% 插件,D5xL5mm Aluminum Electrolytic Capacitors - Leaded ROHSPanasonicAluminum Electrolytic Capacitors - Leaded
K330J15C0GF5TL2
插件,P=2.5mm2.5mm 33pF 50V C0G ±5% Plugin,P=2.5mm Multilayer Ceramic Capacitors MLCC - Leaded ROHSVishay IntertechnologyMultilayer Ceramic Capacitors MLCC - Leaded
CF14JT33R0
插件,D2.3xL6mm-400ppm/℃~0ppm/℃ -55℃~+155℃ 250mW 33Ω Carbon Film Resistor ±5% 插件,D2.3xL6mm Through Hole Resistors ROHSStackpole Electronics (SEI)Through Hole Resistors
PRPC002SAAN-RC
插件,P=2.54mm-40℃~+105℃ 1 1x2P 2.54mm 2.5mm 2P 3.05mm 3A 5.84mm Black Brass Gold Square pin Through Hole Plugin,P=2.54mm Pin Headers ROHSSullins Connector SolutionsPin Headers
MP107-E
HC-49U-40℃~+85℃ 10.738635MHz 30Ω 32pF ±30ppm ±50ppm HC-49U Crystals ROHSCTS Electronic ComponentsCrystalsCF14JT10K0
插件,D2.3xL6mm-500ppm/℃~0ppm/℃ -55℃~+155℃ 10kΩ 250mW Carbon Film Resistor ±5% 插件,D2.3xL6mm Through Hole Resistors ROHSStackpole Electronics (SEI)Through Hole Resistors
2N3904TAR
TO-92-3-55℃~+150℃ 1 NPN 100 200mA 200mV 300MHz 40V 50nA 625mW 6V NPN TO-92-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)GKG50015
插件-25℃~+85℃ 100V 10pF~50pF 200@1MHz 5mm 插件 Trimmers, Variable Capacitors ROHSEW ElectronicsTrimmers, Variable Capacitors
README
Apple/Peripherals/ezcgi/README.mdThis is a transcription into KiCad of Steve Ciarcia's E-Z Color Graphics Interface, described in the August 1982 issue of Byte magazine. It's not a line-for-line copy, but takes advantage of KiCad features that wouldn't have been available 40 years ago.
I originally posted this on GitLab, and that's where you can also find gerbers, a STEP model, and other extras, though KiCad 6 should be sufficient to regenerate those from the files presented here. Parts are annotated with manufacturer and part-number fields, and current (as of December 2022) distributor SKUs are provided for all but the TMS9918A... you'll need to trawl eBay for one of those.
The sockets_*.kicad_sch sheets are present so that any BOM that you generate will include sockets for all devices that can use them.
As with the schematic, the PCB layout isn't a 1:1 copy. The article didn't provide the author's original layout, so mine is what I came up with on my own. The components are laid out in a similar order, but the connections between them are my own work. I haven't yet had a chance to build this board.
KiCad has gotten better at including symbols and footprints in files, but you might still find my kicad-libs collection useful, especially if you want to modify these files or grab symbols out of it (footprints are all stock KiCad, IIRC).
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0.1µF | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 |
| 8 | 4116 | Package_DIP:DIP-16_W7.62mm_Socket | IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10 |
| 3 | 10µF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C9, C10, C14 |
| 2 | 33pF | Capacitor_THT:C_Disc_D7.5mm_W5.0mm_P5.00mm | C12, C13 |
| 2 | 33Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 2 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1, JP2 |
| 1 | 10.7386MHz | Crystal:Crystal_HC49-U_Horizontal_1EP_style2 | X1 |
| 1 | 10kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1 |
| 1 | 5-50pF | passives:C_Trimmer_THT_5mm | C11 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket | IC2 |
| 1 | A2Bus | apple2-bus:Male_Card-Edge_50_pin__100_mil | P1 |
| 1 | Composite Out | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | Ext Video In (DNP) | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | TMS9918A | Package_DIP:DIP-40_W15.24mm_Socket | IC1 |
Questions
How big is the Ezcgi PCB?
It measures 127 × 69.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ezcgi use?
34 parts, built around the SN74LS00N, C315C104M5U5TA, ECE-A1EKS100B and K330J15C0GF5TL2. 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 Ezcgi KiCad files?
From the baldengineer/bit-preserve repository on GitHub, at the commit this page was made from: the board is Apple/Peripherals/ezcgi/ezcgi.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ezcgi design in my own project?
Its repository states no licence, so its author keeps all rights: ask baldengineer before reusing the design.
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