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STD Z80 Single Board Computer 2.0x 56k
Z80 Single Board Computer 2.0x 56k
License
TAPR Open Hardware License
License: TAPR Open Hardware LicenseMode:
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Update time：
2024-06-29 15:48:26
Creation time：
2024-06-07 11:33:32
Description
Description
This board is my design for the Grant Searle 56k z80 computer. This design has been the starting point for many other SBC's and now this one!
The expansion port is now 40pin Scothern Cross compatible, see my other projects for a 4 slot backplane. You can also use the backplane created for the Southern Cross SBC.
A new jumper to disable onboard memory has been added, useful when using RomWBW on an rc2014/rcbus card.
The RTS line is now connected for hardware flow control. You may still need delays in your terminal software.
An extra power socket.
A ground plane added to reduce cross talk etc.
Design Drawing
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity | link | |
|---|---|---|---|---|---|---|
| 1 | 100n | C1,C2,C3,C4,C5,C6 | RAD-0.1 | 6 | C_0603_US | |
| 2 | 10uF | C7 | RAD-0.1 | 1 | C_Tan_SMD_A_US | |
| 3 | 22pF | C8,C9 | RAD-0.2 | 2 | C_0603_US | |
| 4 | POWER | D1 | LED-TH_BD3.0-P2.54-RD | 1 | LED | |
| 5 | FTDI | H1 | HEADER 1X6 | 1 | Header 1x6 | |
| 6 | USB POWER | J1 | 1X2 PIN HEADER 2.54MM | 1 | HEADER 1X2 | |
| 7 | PWR | J2 | JST_XH_B2B-XH-A_1X02_P2.50MM_VERTICAL CZ | 1 | JST_XH_B2B-XH-A_1X02_P2.50MM_VERTICAL | |
| 8 | MEM | J3 | 1X2 PIN HEADER 2.54MM | 1 | HEADER 1X2 | |
| 9 | Block | J4 | HDR-2X02-S-M-2.54MM | 1 | Jumper_2x2 | |
| 10 | ZX-IDC2.54-2-20PZZ | P1 | IDC-TH_40P-P2.54_ZX-IDC2.54-2-20PZZ | 1 | ZX-IDC2.54-2-20PZZ | |
| 11 | 2K2 | R1 | R_AXIAL-0.3 | 1 | R_0603_US | |
| 12 | 1M | R2 | R_AXIAL-0.3 | 1 | R_0603_US | |
| 13 | 1K | R3 | R_AXIAL-0.3 | 1 | R_0603_US | |
| 14 | 3K3 | R4,R5 | R_AXIAL-0.3 | 2 | R_0603_US | |
| 15 | 330 | R6 | R_AXIAL-0.3 | 1 | R_0603_US | |
| 16 | 10k | R7,R8,R9,R10 | R_AXIAL-0.3 | 4 | R_0603_US | |
| 17 | RESET | SW1 | TACTILE-PTH-EZ | 1 | PUSHBUTTON | |
| 18 | 68B50 | U1 | CZ-DIP-24_600MIL | 1 | 68B50 | |
| 19 | Z80 | U2 | DIP40 | 1 | Z80CPU | |
| 20 | AS6C1008 | U4 | DIP32-600-CZ | 1 | AS6C1008 | |
| 21 | 27C64+ | U6 | DIP28-600 | 1 | 27C64 | |
| 22 | 7.3728M MHz | X1 | HC-49S | 1 | Crystal HC-49S | |
| 23 | 74HCT04 | U5 | DIP14 | 1 | 74HCT04 | 1 |
| 24 | 74LS32 | U7 | DIP14 | 1 | 74LS32 | 1 |
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