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Update README with notes about u2

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Matt Harlum 2022-04-02 14:52:00 +00:00
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README.md
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@ -12,6 +12,7 @@ Special thanks to [GadgetUK164](https://www.youtube.com/user/GadgetUK164) and sp
1. [PCB Ordering](#ordering-pcbs)
1. [Jumpers](#jumpers)
1. [Bill of materials](#bill-of-materials)
1. [Troubleshooting](#troubleshooting)
## Status
@ -32,14 +33,21 @@ For best results the boards should be manufactured with the "Gold Fingers" optio
### Bill of materials
|Component|Location|QTY|Link|
|---------|--------|---|------|
|LM1117-3.3 SOT-223|U1|1|[Mouser](https://www.mouser.com/ProductDetail/926-LM1117IMP3.3NOPB)|
|XC9572XL-10TQ100C|U5|1|[Mouser](https://www.mouser.com/ProductDetail/217-C9572XL-10TQ100C)|
|74LS245 SOIC|U3,U4|2|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LS245DWR)|
|74LVC2G07|U2|1|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LVC2G07DBVR)|
|5v 1MBx16 DRAM, SOJ-42 i.e K4E151611, MT4C1M16E5 etc.|U6,U7,U8,U9|4|Aliexpress, Ebay etc|
|0.1uF Ceramic capacitor, 0805|C4-25|22|[Mouser](https://www.mouser.com/ProductDetail/581-08055C104K)|
|10uF Ceramic capacitor, 1206|C2,C3|2|[Mouser](https://www.mouser.com/ProductDetail/80-C1206C106K4R)|
|100uF Electrolytic Capacitor|C1|1|[Mouser](https://www.mouser.com/ProductDetail/667-16SEPC100M)|
|10K Resistor, 0805|R1|1|[Mouser](https://www.mouser.com/ProductDetail/754-RR1220P-103D)
|Component|Location|QTY|Link|Note|
|---------|--------|---|----|----|
|LM1117-3.3 SOT-223|U1|1|[Mouser](https://www.mouser.com/ProductDetail/926-LM1117IMP3.3NOPB)||
|XC9572XL-10TQ100C|U5|1|[Mouser](https://www.mouser.com/ProductDetail/217-C9572XL-10TQ100C)||
|74LS245 SOIC|U3,U4|2|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LS245DWR)||
|74LVC2G07|U2|1|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LVC2G07DBVR)|*Optional - See below|
|5v 1MBx16 DRAM, SOJ-42 i.e K4E151611, MT4C1M16E5 etc.|U6,U7,U8,U9|4|Aliexpress, Ebay etc||
|0.1uF Ceramic capacitor, 0805|C4-25|22|[Mouser](https://www.mouser.com/ProductDetail/581-08055C104K)||
|10uF Ceramic capacitor, 1206|C2,C3|2|[Mouser](https://www.mouser.com/ProductDetail/80-C1206C106K4R)||
|100uF Electrolytic Capacitor|C1|1|[Mouser](https://www.mouser.com/ProductDetail/667-16SEPC100M)||
|10K Resistor, 0805|R1|1|[Mouser](https://www.mouser.com/ProductDetail/754-RR1220P-103D)|
\* U2 buffers the cards generated DTACK and OVR signals - In a pinch this can be left out but you will run into problems with the A2091 and some other devices so it is best to fit this and save yourself the headache
## Troubleshooting
* Symptom: System does not boot, the power LED does not change brightness
Solution: Possible incorrect orientation/faulty ic in U2 - check orientation and/or remove this IC and try again