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Posted: 17 Feb 2020, 19:57 

Hey @admin, I know this is an old thread but I came across it while researching players. BMB is a subsidiary of Nikkodo, which was a US/Japan karaoke equipment manufacturer.

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Posted: 24 May 2020, 01:29 

Members in the past have even said all of them use the exact same IC. More information here: https://forum.lddb.com/viewtopic.php?f=24&t=876

I got curious today after hearing this on LDF, and I can confirm after looking through a bunch of service manuals that there are at least two ICs that were in use, both by Pioneer.

The Pioneer RFD-1 uses the PD4007A, and the Yamaha ADP-1 uses the PD4606A. Both of these are 100 pins, but the pinouts have been rearranged.

The Sony MOD-RF1 uses a "SN-PM4007A", which I suspect is a rebranded PD4007A.

The McIntosh MAC-3 uses a proprietary 20-pin chip labeled RF1.
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