--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tcsm2-notes/trco	Wed May 29 02:26:13 2024 +0000
@@ -0,0 +1,30 @@
+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
+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.