Notices by Foone🏳️‍⚧️ (foone@digipres.club), page 5

It's got 4 of these CS8411-CS digital audio receivers, and then 4 of these CS8401-CS digital audio transmitters.

It's also got a Motorola DSP56002PV80, a 24-bit DSP.

Then the final board is a Timeline PRX ASSY 70383.
More SRAMs and lattice chips, and a PLX PCI9060 bus controller.
So I suspect that many-pins backplane they use to connect all the boards may be a second PCI bus.

Then another of the same board, but this one is missing the receiver/transmitter chips. It's just got the RAM and FPGA.

and it's got three 32mb SDRAMs.
So 96mb in total. That's a bunch for a Pentium 1!

The front panel is communicated with through this MMR FP/UIB Interface, Assy 70301.

It's just a bunch of caps and resistors?

The front-panel display is a Optrex DMC-2026I display. 20x20 characters, each character being 5x8 pixels. This variant has a backlight, and it's built on the standard Hitachi HD44780 chip.

Those power these two boards (with room for a third, missing on this model)
This one is the MMR Input Converter, ASSY 70395. 8-channels.

So it's got a separate power supply inside the case, plugged into a splitter on the power button line. (which, on an AT system, carries the full AC wall voltage)
It provides ±18v at half an amp.

The back panel has two PCBs.
The top one is a Parallel Remote board, ASSY 70374

It's got 4 of these UCN6821A 8-channel line drivers.

And the floppy drive is a TEAC FD-235HF, one of the most common models of 3.5" floppy disk drives.

And an MMR Output Converter, ASSY 70372.

The power supply is a US Power SP2-4200F, a 200 watt AT supply.
But modified to have a different connector for the front power switch, so it can be branched off to the other power supply.

Then the bottom board is the MMR Rear Panel, ASSY 70389.
Left to right, we've got Transport, Editor, two Lynx ports, Timecode Out/In, MIDI thru/out/in, video out/in, and word clock out/in.

Doesn't seem to be any smarts on the board. Another of those UCN 5821A 8-channel drivers, and 5 Maxim MAX7219CWG LED drivers

No chips on the other side. Just a bunch of buttons and LEDs. Interesting there's some spots for buttons that aren't present here.

So the front panel. There's three PCBs.
The big one is the 8 TRK FP-70311, which the other two little ones connect to.

and the MMR Transport SW, ASSY 70392.
I think these are combination buttons/lights.

Other two boards:
first an MMR Headphone Monitor, Assy 70396

So yeah. That's the box! I'll plug in my archive box and try to dump the drive later.