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STD 8085 SBC
8085 SBC
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Update time：
2022-11-14 01:10:43
Creation time：
2018-09-05 12:18:01
Description
Description
This single board computer is using 8085 CPU, 8256 MUART which provides serial port, timer, parallel ports and interrupt controller. RTC is DS12885 which has also small NV RAM backed by battery. NV RAM is mapped into I/O address space. There is also place for CF card adapter. I chanaged the reset IC to TL7705 compared to previous version as I did not really want to use the watchdog. The board works fine so far, only thing I did not test is programming flash memory on the board.
Design Drawing
Design Drawing
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 8085AH | U1 | DIP40 | 1 |
| 2 | 74HCT573N | U2 | DIP20 | 1 |
| 3 | UM61512-15 | U3 | DIP32-300 | 1 |
| 4 | SST39SF010A-70-4C-PHE | U4 | DIP32-600 | 1 |
| 5 | OSC-XTAL | 10.240MHZ | HC-49U-PTH | 1 |
| 6 | 33p | C1,C2 | C0.1PTH | 2 |
| 7 | M1 | C3,C4,C6,C7,C8,C9,C10,C12 | C0.1PTH | 8 |
| 8 | 7805 | U5 | TO220H | 1 |
| 9 | 47M | C5 | CAP-D3.0XF1.5 | 1 |
| 10 | Exp 1 | J1 | H2X20-2.54 | 1 |
| 11 | HD74HCT138P | U10 | DIP16 | 1 |
| 12 | 10k | R4,R6 | AXIAL-0.3 | 2 |
| 13 | Serial | J2 | M1X4 | 1 |
| 14 | PWR | J3 | M1X2 | 1 |
| 15 | 8256AH | U6 | DIP40 | 1 |
| 16 | Exp 2 | J4 | H2X20-2.54 | 1 |
| 17 | 2.1MMJACK | U7 | PJ-102A | 1 |
| 18 | DS12885 | U13 | DIP24-600 | 1 |
| 19 | 32kHz | X1 | TC-38 | 1 |
| 20 | BATTERY | BAT1 | BATTCOM_20MM_PTH | 1 |
| 21 | 470M | C11 | CAP-D3.0XF1.5 | 1 |
| 22 | TL7705ACP | U9 | DIP8 | 1 |
| 23 | 0.47u | C13 | RAD-0.1 | 1 |
| 24 | 47u | C14 | CAP-D3.0XF1.5 | 1 |
| 25 | 4.7k | R12,R13 | AXIAL-0.3 | 2 |
| 26 | RESET | U14 | TAC-SWITCH-PTH | 1 |
| 27 | P6KE22A | D2 | DO-15 | 1 |
| 28 | 74LS273 | U17 | DIP20 | 1 |
| 29 | 4k7 | R8,R9,R10,R1,R2,R11 | AXIAL-0.3 | 6 |
| 30 | 1k | R3,R5,R7 | AXIAL-0.3 | 3 |
| 31 | 10KΩ | RN1 | SIP-5 | 1 |
| 32 | 1N5821RLG | D1 | DO-201AD | 1 |
| 33 | IDE 44 pinout | U11 | SOCKET_STRIP_STRAIGHT_2X22_PITCH2.00MM | 1 |
| 34 | LED-3MM | LED1,LED2,LED3 | LED-3MM/2.54 | 3 |
| 35 | HD74LS32P | U15 | DIP14 | 1 |
| 36 | HD74LS00P | U8 | DIP14 | 1 |
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