Hello,
I've just downloaded the file you attached in your initil post, and YES, this is the file I created of the HCCS system.
Check the code in the .BIN file, offset 0FB0, and you'll see the J.W.BROWN, and a little further on another. This will be the file that I created from my installed ROM, and posted on another forum some time ago.
I've got an internal RAM expansion card in my HX which may change things, but otherwise my HX is standard as origianlly purchased by my 1982.
I've got a note handwritten in my manual (written by me) which describes process to activate the FORTH ROM. This is not mentioned in the published manual. I don't know if this is relevant dep on the RAM expansion being there, but I think this was written before I had the RAM expansion (which uses some of the same memory space as the FORTH ROM needs??
Enter MONITOR (either using MON then Return from BASIC or thye 1 from Menu.
This in Monitor screen, type
S FFF5 <return>
a value will appear, and a prompt for a new value.
Type 08 <return>
screen will then say
S FFF6 and new value, at this point type '-' (i.e. dash/hyphen char) and press return.
Then B this will exit from Monitor
Then need the Ctrl+@ to reset.
In effect, you are using the Monitor to change the value of one data byte at address FFF5 from whatever it first showed as to 08.
Does this change anything for you.
I'm sure the .BIN file is OK as I'm sure at least one other has got it working OK.
The manual is 100 A5 pages, and it would have been printed using a dot matrix printer and it's not always 100% readable (but the original is OK) so I'm not sure how a scan would come out. Could try, but can't say when.
Geoff