Minimax8085
About the Minimax8085 PCB
Minimax8085 is an open source PCB design by skiselev, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 100 × 80 mm, with 44 components from 30 distinct parts.
Other key parts include the 80C85A, 82C51A, 27C128, 62256 and GAL16V8. By type, the board carries 15 capacitors, 8 ICs, 5 connectors, 3 jumpers, 3 resistors and 2 diodes.
From the project
Simple Intel 8085 based Single Board Computer (SBC)
The resulting design includes 8085 CPU, 8251 USART, 32 KiB SRAM, 32 KiB or 16 KiB ROM. It uses a GAL16V8/ATF16V8 simple programmable logic device (SPLD) instead of discrete logic ICs for the address decode and the frequency divider for USART. It reduces the number of components, allows for tweaking the configuration by re-programming the SPLD, and provides an introduction to the programmable logic devices.
Main components on the Minimax8085
Minimax8085 bill of materials (BOM)
44 components, 30 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 80C85A | IC_DIP40_600 | U1 |
| 1 | 82C51A | IC_DIP28_600 | U2 |
| 1 | 27C128 | IC_DIP28_600 | U3 |
| 1 | 62256 | IC_DIP28_600 | U4 |
| 1 | GAL16V8 | IC_DIP20_300 | U5 |
| 1 | 74HC573 | IC_DIP20_300 | U6 |
| 1 | MAX232A | IC_DIP16_300 | U7 |
| 1 | DS1210 | IC_DIP8_300 | U8 |
| 1 | 6.144MHz | Crystal_HC-49U_Vert | Y1 |
| 1 | POWER | Conn_Power_Jack_Circular_Pads | P1 |
| 1 | SIO | Conn_Pin_Header_3x1_2.54mm | P2 |
| 1 | SERIAL | Conn_Dsub_DE9M | P3 |
| 1 | EXTENSION | Conn_Pin_Header_20x2_2.54mm | P4 |
| 1 | VBAT | Conn_Friction_Lock_2P_2.54mm | P5 |
| 4 | CONN_1 | Hole_3mm | HOLE1, HOLE2, HOLE3, HOLE4 |
| 1 | ROM_1 | Conn_Pin_Header_3x1_2.54mm | JP1 |
| 1 | ROM_27 | Conn_Pin_Header_3x1_2.54mm | JP2 |
| 1 | CLK | Conn_Pin_Header_3x1_2.54mm | JP3 |
| 2 | 4.7k | Conn_SIL6 | RR1, RR2 |
| 1 | RESET | Switch_Tactile_6mm_Right | SW1 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1N4148 | Diode_762 | D1 |
| 1 | PWR | LED_Dialight_566-0206F | D2 |
| 6 | 0.1uF | Cap_Cer_508 | C1, C2, C3, C4, C5, C6 |
| 5 | 0.1uF | Cap_Pol_508_3 | C7, C8, C9, C10, C11 |
| 1 | 1uF | Cap_Pol_508_3 | C12 |
| 1 | 10uF | Cap_Pol_508_3 | C13 |
| 2 | 33pF | Cap_Cer_508 | C14, C15 |
| 1 | 33 | Res_762 | R1 |
| 1 | 470 | Res_762 | R2 |
| 1 | 100k | Res_762 | R3 |
Minimax8085 design files
The KiCad project lives in the skiselev/minimax8085 repository on GitHub; these links point at the commit this page was built from.
- LayoutKiCad/Mini8085.kicad_pcb
Minimax8085: common questions
How big is the Minimax8085 PCB?
The Minimax8085 measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Minimax8085?
44 components, from 30 distinct parts. The full bill of materials is listed on this page.
Where can I download the Minimax8085 design files?
From the skiselev/minimax8085 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Minimax8085 design in my own project?
Yes, under the terms of its GPL-3.0 license, which skiselev chose for the repository.