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boards:ecb:backplane-3:start [2017/03/18 12:24] will |
boards:ecb:backplane-3:start [2022/11/02 11:20] (current) zenxyzzy |
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===== Introduction ===== | ===== Introduction ===== | ||
- | The ECB Mini Backplane is a backplane card for the EuroCard Bus which allows up to 3 ECB cards to be connected at one time. It features a power input, power switch, LED to indicate when power is on, and a 2-pin input header to connect a reset switch. On the reverse | + | The ECB Mini Backplane is a backplane card for the EuroCard Bus which allows up to 3 ECB cards to be connected at one time. |
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+ | The backplane | ||
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+ | The reset input header is connected to pin C31 for Kontron compatible reset (which is recommended over the legacy " | ||
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+ | The board is designed to be used either | ||
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+ | The 2018 PCBs are manufactured using 1.6mm thick FR4 with lead solder HASL finish (the 2017 boards used 2.0mm thick FR4 with ENIG finish, however HASL is nicer to solder, 1.6mm is easily strong enough, and it reduces the cost significantly) | ||
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+ | ===== Schematic ===== | ||
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+ | {{: | ||
===== Bill of Materials ===== | ===== Bill of Materials ===== | ||
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|POWER SW|SPDT Toggle Switch, ON-ON type, 0.185" lead spacing, 5A rating|TE Connectivity A101SYCQ04 (Mouser order code 506-A101SYCQ04)| | |POWER SW|SPDT Toggle Switch, ON-ON type, 0.185" lead spacing, 5A rating|TE Connectivity A101SYCQ04 (Mouser order code 506-A101SYCQ04)| | ||
|POWER IN|4-pin disk drive power connector|Molex 15-24-4745 (Farnell order code 1391827)| | |POWER IN|4-pin disk drive power connector|Molex 15-24-4745 (Farnell order code 1391827)| | ||
- | |U1, U2, U3|DIN 41612 Connector, Type C Socket, 96 contacts|TE Connectivity 5535043-5 (Mouser order code 571-5535043-5)| | + | |U1, U2, U3|DIN 41612 Connector, Type C Socket, 96 contacts|TE Connectivity 5535043-5 (Mouser order code 571-5535043-5), or 535090 which has shorter pins| |
- | |C1, C2, C6, C7|Capacitor with 0.2" lead spacing, under 10mm diameter, under 12mm height (Builder' | + | |C1, C2, C6, C7|Capacitor with 0.2" lead spacing, under 10mm diameter, under 12mm height (Builder' |
|R1|470 ohm 0.25W resistor|Multicomp MCF 0.25W 470R (Farnell order code 9339531)| | |R1|470 ohm 0.25W resistor|Multicomp MCF 0.25W 470R (Farnell order code 9339531)| | ||
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Make sure you fit the ECB sockets the correct way round! See the photographs if unsure. | Make sure you fit the ECB sockets the correct way round! See the photographs if unsure. | ||
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+ | The power switch is optional and can be omitted simply by fitting a (reasonably thick) wire jumper in its place. | ||
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+ | Ensure any electrolytic capacitors are fitted observing the correct polarity (as marked on the board). Choose capacitors small enough not to interfere with ECB card insertion. | ||
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+ | If you will be using the Interrupt or DMA chains you will need to fit four wire jumpers connecting /BAO to /BAI and /IEO to /IEI as indicated on the PCB. The only Retrobrew Computers board to use these signals is the "Zilog Peripherals" | ||
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+ | If you intend to use the board lying flat with the cards standing up, fit four 3M BumpOn rubber domes on the rear to prevent scratching your work surfaces. If you intend to use the board vertically with the ECB cards lying against the desk be aware that many cards will be " | ||
===== Photographs ===== | ===== Photographs ===== | ||
- | {{: | + | [[https:// |
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+ | Curt Mayer (curt@zen-room.org) has published a 3d printable card cage for this motherboard. | ||
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+ | it can be downloaded from https:// | ||
- | \\ | + | {{https:// |