IBMExtender
About the IBMExtender PCB
IBMExtender is an open source PCB design by schlae, published on GitHub. It is a 4-layer board measuring 203.2 × 105.4 mm, with 43 components from 25 distinct parts.
Other key parts include the 74LS125, 74S08, 74S74, 74LS138 and 74LS155. By type, the board carries 23 ICs, 9 capacitors, 8 resistors, 2 connectors and 1 switch.
From the project
IBM 5161 expansion chassis extender and receiver cards
This project duplicates both the extender and receiver cards used in the IBM 5161 expansion chassis. This is a box that looks identical to an IBM PC, only it has simple backplane instead of a motherboard. An extender card located in a host PC/XT system connects to a receiver card located in the expansion chassis using a large 62-pin D-sub cable.
Even if you don't own (all or part) of an IBM 5161, this project may still be useful to you. It works perfectly with various passive ISA backplanes! There is one slight catch--the 14.318MHz ISA bus clock signal is generated on the IBM backplane but…
Main components on the IBMExtender
IBMExtender bill of materials (BOM)
43 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS125 | DIP254P762X635-14 | U1 |
| 1 | 74S08 | DIP254P762X635-14 | U2 |
| 1 | 74S74 | DIP254P762X635-14 | U3 |
| 1 | 74LS138 | DIP254P762X635-16 | U4 |
| 1 | 74LS155 | DIP254P762X635-16 | U5 |
| 1 | 74LS20 | DIP254P762X635-14 | U6 |
| 6 | 74LS244 | DIP254P762X635-20 | U7, U8, U17, U18, U19, U20 |
| 3 | 74LS374 | DIP254P762X635-20 | U9, U10, U11 |
| 1 | 74LS245 | DIP254P762X635-20 | U12 |
| 1 | 74LS74 | DIP254P762X635-14 | U13 |
| 1 | 74LS00 | DIP254P762X635-14 | U14 |
| 1 | 74LS04 | DIP254P762X635-14 | U15 |
| 1 | 74LS32 | DIP254P762X635-14 | U16 |
| 1 | 74LS85 | DIP254P762X635-16 | U21 |
| 2 | SN7417 | DIP254P762X635-14 | U22, U23 |
| 1 | DB62 | DB62 | J1 |
| 1 | Bus_ISA_8bit | BUS_PC | J2 |
| 1 | SW_DIP_x04 | SW_DIP_x4_W7.62mm_Slide | SW1 |
| 2 | 10uF | C_Disc_D0.2in_W0.1in_P0.2in | C1, C9 |
| 7 | 0.047uF | C_Disc_D0.2in_W0.1in_P0.2in | C2, C3, C4, C5, C6, C7, C8 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 4.7K | R_Axial_L0.26in_D0.92in_P0.5in_Horizontal | R1 |
| 2 | 330 | R_Axial_L0.26in_D0.92in_P0.5in_Horizontal | R2, R3 |
| 2 | 220 | R_Axial_L0.26in_D0.92in_P0.5in_Horizontal | R4, R5 |
| 1 | RPAC15_BUSSED | DIP254P762X635-16 | RN1 |
| 2 | 8.2K | DIP254P762X635-16 | RN2, RN3 |
IBMExtender design files
The KiCad project lives in the schlae/ibm-extender repository on GitHub; these links point at the commit this page was built from.
IBMExtender: common questions
How big is the IBMExtender PCB?
The IBMExtender measures 203.2 × 105.4 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the IBMExtender?
43 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the IBMExtender design files?
From the schlae/ibm-extender repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the IBMExtender design in my own project?
The repository has no license, so all rights stay with schlae. Use it as a reference, and ask the author before reusing the design.
