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STD 2068 ROM Bypass Board

License: Public Domain

Mode: Editors' pick

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Update time: 2020-06-02 15:29:22
Creation time: 2020-05-30 16:50:34
Description
Redrawn schematic based on William Pedersen/Larry Crawford's work to build an external board that bypasses the internal HOME and EXROM in the Timex/Sinclair 2068. Article here: https://archive.org/stream/ts-2068-update/Update%20Jan%201995#page/n4/mode/1up
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PCB
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ID Name Designator Footprint Quantity
1 TS2068 EDGE CONNECTOR - DIL SOCKET CONN1 TS2068 EDGE CONNECTOR - DIL SOCKET 1
2 1N914 D2,D1 DO-35_BD2.0-L4.2-P8.20-D0.5-RD 2
3 4.3K R8,R6,R7,R1,R4,R3,R2,R5 AXIAL-0.3 8
4 DPDT SW1,SW2,SW3,SW4 DPDT 4
5 27C256 U7,U8 DIP28-600 2
6 74LS08 U6 DIP-14 1
7 220uF C11 CAP-TH_BD6.3-P2.50-D1.0-FD 1
8 74LS00 U2 DIP14 1
9 100nF C2,C6,C7,C8,C9,C10,C1,C3,C4,C5 CAP-TH_L5.0-W2.5-P2.54-D0.7 10
10 SN74LS74AN U3 DIP14 1
11 74LS125 U4 DIP14 1
12 Battery B1 BAT-2 1
13 62256 U9,U10 28PIN-DIP-0.6 2
14 74LS32 U1 74LS32 1
15 74LS138 U5 DIL16 1

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