Cisc-8
About the Cisc-8 PCB
Cisc-8 is an open source PCB design by nailed-barnacle, published on GitHub under the MIT license. It is a 2-layer board measuring 299.7 × 198.1 mm, with 315 components from 22 distinct parts.
Other key parts include the 74HC574, 74HC138, 74HC08, 74HC541 and 74HC32. By type, the board carries 159 ICs, 155 capacitors and 1 connector.
From the project
A cut-down version of the 8080 processor using HCTTL and including a discrete ALU and instruction decoder
This is an attempt to replicate most of the functionality of the 1970s Intel 8080 processor using contemporary HCTTL surface mount components.
By implementing most - though by no means all - of the instructions of the 8080 it allows the use of existing toolchains to generate code for the device both for the hardware implementation and the associated simulation.
Main components on the Cisc-8
Cisc-8 bill of materials (BOM)
315 components, 22 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 21 | 74HC574 | SOIC-20W_7.5x12.8mm_P1.27mm | U201, U202, U203, U204, U205, U206, U207, U208 +13 |
| 1 | 74HC138 | SOIC-16_3.9x9.9mm_P1.27mm | U301 |
| 29 | 74HC08 | SOIC-14_3.9x8.7mm_P1.27mm | U302, U303, U306, U1103, U1403, U1405, U1406, U1407 +21 |
| 21 | 74HC541 | SOIC-20W_7.5x12.8mm_P1.27mm | U304, U312, U315, U316, U321, U322, U323, U403 +13 |
| 16 | 74HC32 | SOIC-14_3.9x8.7mm_P1.27mm | U307, U308, U310, U1404, U1411, U1413, U1501, U1509 +8 |
| 11 | 74HC238 | SOIC-16_3.9x9.9mm_P1.27mm | U309, U1204, U1205, U1206, U1301, U1417, U1418, U1419 +3 |
| 4 | 74HC04 | SOIC-14_3.9x8.7mm_P1.27mm | U311, U1001, U1409, U1603 |
| 12 | 74HC4075 | SOIC-14_3.9x8.7mm_P1.27mm | U313, U1416, U1503, U1504, U1508, U1517, U1703, U1801 +4 |
| 3 | 74HC86 | SOIC-14_3.9x8.7mm_P1.27mm | U314, U317, U801 |
| 1 | 74HC4002 | SOIC-14_3.9x8.7mm_P1.27mm | U318 |
| 6 | 74HC283 | SOIC-16_3.9x9.9mm_P1.27mm | U319, U320, U607, U608, U609, U610 |
| 2 | 74HC74 | SOIC-14_3.9x8.7mm_P1.27mm | U401, U1101 |
| 4 | 74HC157 | SOIC-16_3.9x9.9mm_P1.27mm | U402, U802, U1604, U1605 |
| 5 | 74HC163 | SOIC-16_3.9x9.9mm_P1.27mm | U501, U503, U506, U508, U901 |
| 5 | 74HC27 | SOIC-14_3.9x8.7mm_P1.27mm | U1102, U1414, U1707, U1806, U2107 |
| 4 | 74HC11 | SOIC-14_3.9x8.7mm_P1.27mm | U1201, U1202, U1203, U1207 |
| 2 | 74HC00 | SOIC-14_3.9x8.7mm_P1.27mm | U1401, U1706 |
| 3 | 74HC02 | SOIC-14_3.9x8.7mm_P1.27mm | U1402, U1523, U1705 |
| 1 | 74HC10 | SOIC-14_3.9x8.7mm_P1.27mm | U1708 |
| 8 | 74HC00-74xx | SOIC-14_3.9x8.7mm_P1.27mm | U2001, U2002, U2003, U2004, U2005, U2006, U2007, U2008 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_02x20_Odd_Even | PinHeader_2x20_P2.54mm_Vertical_SMD | J2001 |
| 155 | 100n | C_0603_1608Metric | C201, C202, C203, C204, C205, C206, C207, C208 +147 |
Cisc-8 design files
The KiCad project lives in the nailed-barnacle/Cisc-8-ttl-processor repository on GitHub; these links point at the commit this page was built from.
- Layoutcisc-8.kicad_pcb
- BOMcisc-8-bom.csv
Cisc-8: common questions
How big is the Cisc-8 PCB?
The Cisc-8 measures 299.7 × 198.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cisc-8?
315 components, from 22 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 Cisc-8 design files?
From the nailed-barnacle/Cisc-8-ttl-processor repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Cisc-8 design in my own project?
Yes, under the terms of its MIT license, which nailed-barnacle chose for the repository.
