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STD 8085 SBC

Project Status: Ongoing

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Creation time: 2018-09-05 12:18:01
Update time: 2022-11-14 01:10:43
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. ![sbc85.jpg](//image.easyeda.com/pullimage/9FV0KEf8TDNmTdMetmFw2tvqrZyMQgg4wi2ApE9h.jpeg)
Design Drawing
schematic diagram
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PCB
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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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