Minimax8085-apu ext
About the Minimax8085-apu ext PCB
Minimax8085-apu ext is an open source PCB design by skiselev, published on GitHub. It is a 2-layer board measuring 100 × 80 mm, with 38 components from 22 distinct parts.
Other key parts include the 8231A, 82C55, 82C54, 62256 and 74HCT138. By type, the board carries 13 capacitors, 10 ICs, 5 connectors, 5 resistors, 4 jumpers and 1 fuse.
From the project
Arithmetic Processor and Extension Board for MiniMax 8085 SBC
The MiniMax 8085 Arithmetic Processor and Extension board adds to MiniMax 8085 SBC an AMD Am9511A / Intel 8231A Arithmetic Processor Unit (APU), Intel 8255 Programmable Parallel Interface (PPI), Intel 8254 Programmable Interrupt Timer (PIT), and switchable 32 KiB SRAM, that can swapped in instead of MiniMax 8085 on-board ROM. It is designed to be plugged on the top of MiniMax8085 using 2x20 pin header / pin socket.
Main components on the Minimax8085-apu ext
Minimax8085-apu ext bill of materials (BOM)
38 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 8231A | IC_DIP24_600 | U1 |
| 1 | 82C55 | IC_DIP40_600 | U2 |
| 1 | 82C54 | IC_DIP24_600 | U3 |
| 1 | 62256 | IC_DIP28_600 | U4 |
| 1 | 74HCT138 | IC_DIP16_300 | U5 |
| 2 | 74HCT74 | IC_DIP14_300 | U6, U7 |
| 1 | 74HCT32 | IC_DIP14_300 | U8 |
| 1 | 74HCT00 | IC_DIP14_300 | U9 |
| 1 | TBA1-0512E | DC-DC_SIP7 | U10 |
| 1 | READY | Conn_Pin_Header_2x1_2.54mm | J1 |
| 1 | OUT1 | Conn_Pin_Header_2x1_2.54mm | J2 |
| 1 | OUT2 | Conn_Pin_Header_2x1_2.54mm | J3 |
| 1 | PARALLEL | Conn_Pin_Header_13x2_2.54mm_Shrouded | J4 |
| 1 | EXTENSION | Conn_Pin_Header_20x2_2.54mm | J5 |
| 1 | 1.1A | Cap_Cer_508 | F1 |
| 1 | CLK1 | Conn_Pin_Header_3x1_2.54mm | JP1 |
| 2 | GATE2 | Conn_Pin_Header_3x1_2.54mm | JP2, JP4 |
| 1 | CLK2 | Conn_Pin_Header_3x1_2.54mm | JP3 |
| 11 | 0.1uF | Cap_Cer_508 | C1, C2, C3, C4, C5, C6, C7, C8 +3 |
| 2 | 47uF | Cap_Elec_Radial_6.3mm | C12, C13 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 1K | Res_762 | R1, R2, R3 |
| 2 | 4.7K | Res_762 | R4, R5 |
Minimax8085-apu ext design files
The KiCad project lives in the skiselev/minimax8085-apu-ext repository on GitHub; these links point at the commit this page was built from.
Minimax8085-apu ext: common questions
How big is the Minimax8085-apu ext PCB?
The Minimax8085-apu ext measures 100 × 80 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Minimax8085-apu ext?
38 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the Minimax8085-apu ext design files?
From the skiselev/minimax8085-apu-ext repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Minimax8085-apu ext design in my own project?
The repository has no license, so all rights stay with skiselev. Use it as a reference, and ask the author before reusing the design.