Major components on TRCO board:

1x Lattice ispLSI1032E PLD, same as on TR16-S
1x CPU: Intel TN80C186EB20

1x really big oscillator component, labeled 16.384 MHz, likely OCXO (or TCXO?)
1x MAS9316N DAC close to it - likely TDM common clock for the system

3x Infineon chips, 2x SAB 82525 (2x HDLC) and 1x SAB 82526 (1x HDLC):
the 5 HDLC channels which the available documentation touches on

8x PLCC32 chips (9 pins on wide side, 7 pins on narrow side) with stickers
on them that obscure the markings underneath.  The markings read IC45 through
IC48 in the top row of 4, IC55 through IC58 in the bottom row of 4.  All 8
ICs are directly soldered.  Suspected flash memory.

Next to these 8 ICs there is a socketed PLCC44 IC (11 pins on each side)
with a sticker that reads:

	TRCO
	6.1-0
	TC1ROMQL

It is clearly a programmed part of some kind, but not clear if it is flash
(boot code?) or some PLD or whatever.

Further insight can be gained by peeling off the stickers, but I am not going
there yet: my current plan is to try powering this unit as-is and see if it
comes to life in a useful way.  If it turns out to lack the needed fw, or lack
TFO feature, then proceed further with reverse eng.