Cpu8085
About the Cpu8085 PCB
Cpu8085 is an open source PCB design by hotkeysoft, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 30 components from 22 distinct parts.
Other key parts include the GLUE_LOGIC, 27C256, IS61C256AH, 8250 and FTDI-USB. By type, the board carries 10 capacitors, 8 ICs, 6 resistors, 2 connectors, 1 transistor and 1 crystal.
From the project
Simple 8085 computer with serial IO
Features ============ - 32KB ROM - Address [0x0000-7FFF] - 32KB RAM - Address [0x8000-FFFF] - 82C54 PIT (Programmable Interval Timer) - Port [0x40-0x43] - UART 8250 or 16550 - Port [0x60-0x67] - Connected to FTDI SerialUSB Adapter
Notes ============ - No voltage regulation on board, no protection of any kind - I made a somewhat working BASIC interpreter from scratch that runs on this hardware: pfe_8085basic
Main components on the Cpu8085
Cpu8085 bill of materials (BOM)
30 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | GLUE_LOGIC | DIP-20_W7.62mm | U1 |
| 1 | 27C256 | DIP-28_W15.24mm_Socket | U2 |
| 1 | IS61C256AH | DIP-28_W7.62mm | U3 |
| 1 | 8250 | DIP-40_W15.24mm_Socket | U4 |
| 1 | FTDI-USB | FTDI_USB | U5 |
| 1 | 82C54 | DIP-24_W15.24mm_Socket | U6 |
| 1 | 8085 | DIP-40_W15.24mm_Socket | U7 |
| 1 | 74LS573 | DIP-20_W7.62mm | U8 |
| 1 | 2N3904 | TO-92_Inline_Wide | Q1 |
| 1 | 4MHz | Crystal_HC49-U_Vertical | Y1 |
| 1 | POWER | Molex_KK-254_AE-6410-04A_1x04_P2.54mm_Vertical | J1 |
| 1 | SPEAKER | PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | RESET | PinHeader_1x02_P2.54mm_Vertical | SW1 |
| 1 | 1N4004 | D_DO-35_SOD27_P10.16mm_Horizontal | D1 |
| 7 | 0.1uF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7 |
| 2 | 1uF | CP_Radial_D5.0mm_P2.50mm | C8, C10 |
| 1 | 22pF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C9 |
| 1 | 75K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 33 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10K | R_Array_SIP8 | RN1 |
| 2 | 10K | R_Array_SIP6 | RN2, RN3 |
Cpu8085 design files
The KiCad project lives in the hotkeysoft/cpu8085-kicad repository on GitHub; these links point at the commit this page was built from.
- LayoutCPU8085.kicad_pcb
Cpu8085: common questions
How big is the Cpu8085 PCB?
The Cpu8085 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cpu8085?
30 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the Cpu8085 design files?
From the hotkeysoft/cpu8085-kicad repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Cpu8085 design in my own project?
The repository has no license, so all rights stay with hotkeysoft. Use it as a reference, and ask the author before reusing the design.