Io
About the Io PCB
Io is an open source PCB design by ddanila, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 36 components from 14 distinct parts.
Other key parts include the MD8251A/B, ATF22V10C IO, 4.9152MHz, MD82C55A/B and SN74LS148N. By type, the board carries 9 ICs, 9 capacitors, 8 LEDs, 1 transistor and 1 buzzer.
From the project
Reconstruction of the Soviet/Estonian Juku E5104 processor board as both a physical PCB and a runnable, headless digital model. The project’s distinctive piece is an LVS-style check that compares the structural Verilog connectivity with the machine-readable board model.
Reconstruction of the Soviet/Estonian Juku E5104 processor board as both a physical PCB and a runnable, headless digital model. The project’s distinctive piece is an LVS-style check that compares the structural Verilog connectivity with the machine-readable board model.
- The C emulator and the structural jukutop model boot the real Juku ROM, render the same framebuffer, accept keyboard input, boot EKDOS from the vendored disk images, and reach disk BASIC READY. The deep value-level guard sync/cosimcheck.sh compares jukutop's typed CPU-bus events against the C emulator (cosim). The default…
Main components on the Io
Io bill of materials (BOM)
36 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MD8251A/B | DIP-28_W15.24mm | U1 |
| 1 | ATF22V10C IO | DIP-24_W7.62mm | U2 |
| 1 | 4.9152MHz | Oscillator_DIP-8 | U3 |
| 1 | MD82C55A/B | DIP-40_W15.24mm | U4 |
| 1 | SN74LS148N | DIP-16_W7.62mm | U5 |
| 1 | MD82C59A/B | DIP-28_W15.24mm | U6 |
| 1 | 74HC393 | DIP-14_W7.62mm | U7 |
| 1 | ID82C54 D57 | DIP-24_W15.24mm | U8 |
| 1 | CD74ACT273E POST | DIP-20_W7.62mm | U9 |
| 1 | P2N3904ABU | TO-92_Inline | Q1 |
| 1 | CPT-1207-5LTH-T | Buzzer_12x9.5RM7.6 | BZ1 |
| 8 | 2.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R_POST0, R_POST1, R_POST2, R_POST3, R_POST4, R_POST5, R_POST6, R_POST7 |
| 8 | WP710A10LGD | LED_D5.0mm | D_POST0, D_POST1, D_POST2, D_POST3, D_POST4, D_POST5, D_POST6, D_POST7 |
| 9 | 100nF | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 +1 |
Io design files
The KiCad project lives in the ddanila/8080-cosim repository on GitHub; these links point at the commit this page was built from.
Io: common questions
How big is the Io PCB?
The Io measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Io?
36 components, from 14 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 Io design files?
From the ddanila/8080-cosim repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Io design in my own project?
The repository has no license, so all rights stay with ddanila. Use it as a reference, and ask the author before reusing the design.
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Video
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