I'm not sure "overclocking" is technically accurate. Nothing I've done so far
has actually speeded up a 24-bit decrement-to-zero asm routine running in
system RAM. Slower, yes, but not faster - So far.
Speeding up BASIC is apparently possible because the interpreter sets the
clock rate at less than top speed - Perhaps because of hardware limitations.
The LCD comes to mind...
Cartridge RAM is a different story. My 24-bit marker routine runs 4X slower
in CRAM with the system defaults - But write >30 to P24 & it runs at system
RAM speed...
There are a number of intermediate speeds as well; intended to allow use
of (back in the day) slow Flash memory, I suspect.
There's a post on the HP list which mentions running 74 asm at 3 MHz :
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=700
I suspect installing a 6 MHz crystal, and tweaking P24 appropriately will
do that - The numbers work, anyway - But I have'nt tried it.
Edits :
"Look at your watch & press "RUN"..." should be, "press ENTER"...
"...register >118 is the TI-74 equivalent of CC40 register >119..." is not
correct - The CC40 Clock ctl register is >11A...
Jack