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| Part No | Chip | Manufacture | Speed nS | Package | Drawing | mm | Price | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | Typ | Max | Pad Pitch | Pad width | Length | |||||||
| 1741279 | SN74LVC1G139DCTR | Ti | <2.5 | SM8 | DCT | 0.65 | 0.3 | 4.25 | $ 0.69 | |||
| SN74LVC1G139DCUT | Ti / Farnell | <2.5 | VSSOP | DCU | 0.50 | 0.25 | 3,20 | £0.403 | ||||
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The Games play without crashing.
Oscilloscope Readings
This produced the signals required.
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| Note | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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The names of the signals on the scope are not all the same as shown in the circuit.
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Printed Circuit Board
Main points
- Small holes 0.47 mm are drilled in the centre of the pads of H1,so that wire links may be used to connect the signals from the 512K/512K card to the PCB.
- The pads of the footprint of the SOT-23-5 have been made longer, to enable easier soldering of the small parts.
- The bottom Left Hand corner of the PCB matches the shape of the 512K/512K Card for easy alignment.
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