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Updated 6809E CPU Adapter (markdown)

David Banks 2019-12-08 15:43:08 +00:00
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6809E-CPU-Adapter.md

@ -103,9 +103,9 @@ Pay attention to the orientation of the 74LVC4245AD devices (U2-6) and they are
Pay particular attention to the orientation of the two schottky diodes (D4,D5). The marked bar is quite faint, but this end should face the outside of the board (allowing current to flow from the adapter board into the FPGA board)
If you struggle to solder fine pitch parts, the three 74LVT125 devices (U7-9) can be ommitted. You will loose two features:
If you struggle to solder fine-pitch parts, the three 74LVT125 devices (U7-9) can be omitted. You will loose two features:
- the external trigger capability (which allows a breakpoint to be qualified by a function of two external signals)
- the TSC capability (a RnW cannot now be tri stated).
- the TSC capability (a RnW cannot now be tristated).
If you do omit U7, make sure to bridge the solder-jumper JP1
## FPGA Firmware