6205 = RTM: Read Trap Register; Jam-loads the AC with the contents of the
Trap Register. The Trap Register contains the instruction that was last
trapped by the MMU.

6215 = SKME: Skip if Memory Management enabled.

6225 = SKMM: Skip if Memory Management installed.

6235 = LTM: LOAD Trap Memory; Loads bit 11 of the AC in the trap/untrap
memory addressed by AC bits 3-8, e.g if AC=230 then the IOT's with
device code 23 (CDF 30, CIF 30 and CDF CIF 30) will be trapped,
if AC=231 these IOT's will NOT be trapped.
The AC is cleared.

6245 = LRM: Load Relocation Memory. AC 6-8 contains the real address
(to become the contents of one word of the Relocation Memory),
AC 9-11 contains the virtual address (used to address to Relocation Memory).
The AC is cleared.

6255 = not used.

6265 = SMME: Set Memory Management Enable.

6275 = CMME: Clear Memory Management Enable. If disabled the MMU is fully
compatible with the normal Memory Extension Control.
The MMU is also disabled by pressing the Load Extended Address key/button
on the front panel.

6200 = CDIF sets DF to match IF.

Other quirks: SGT, RDF, RIF never trap in user mode.

On the other hand, 62x[04567] always trap.