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naomi.cpp: Explain mainboard jumper JP1 (Aica clock source) (#7484)

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FenFenJVS 2020-11-15 23:33:12 -06:00 committed by GitHub
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src/mame/drivers/naomi.cpp
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@ -141,7 +141,7 @@ EPF8452AQC160-3 - Altera FLEX EPF8452AQC160-3 FPGA (QFP160)
A179B - TI SN75179B Differential Driver and Receiver Pair (DIP8)
ADM485 - Analog Devices ADM485 +5 V Low Power EIA RS-485 Transceiver (SOIC8)
PCM1725 - Burr-Brown PCM1725 Stereo Audio Digital to Analog Converter 16 Bits, 96kHz Sampling (SOIC14)
JP1 - set to 2-3. Alt setting is 1-2
JP1 - AICA clock Source; Default From Motherboard set to 2-3. Alt setting is 1-2 from Cart Bus (G2 Expansion BD; Multiboard Clock; other Cart Slot Peripherals that provide Aica Clock)
JP4 - set to 2-3. Alt setting is 1-2
CN1/2/3 - Connectors for ROM cart or GDROM DIMM Unit
CN25/26 - Connectors for Filter Board