Post Reply 
(SOLVED) 41CL - DOUBLE HEPAX ACCESS and MMU CONFIG
08-24-2019, 10:26 PM (This post was last modified: 08-24-2019 10:26 PM by Ángel Martin.)
Post: #65
RE: (SOLVED) 41CL - DOUBLE HEPAX ACCESS and MMU CONFIG
(08-24-2019 08:31 PM)Monte Dalrymple Wrote:  The Hepax uses a different opcode to "move" the code to a different page. Since this is unique to the Hepax, and wouldn't work anyway given the MMU, the Hepax image used in the 41CL actually has that piece of the code removed from the image.

And it works just great with the HEPINI function to manually do what the HEPAX did automatically in the CALC_ON event/

BTW there's another special OpCode used by the HEPAX to write-protect an HRAM page, those guys thought of everything it seems...

(08-24-2019 08:31 PM)Monte Dalrymple Wrote:  The IR printer also uses the special Peripheral instructions, which are also NOPs as far as the CPU is concerned. This operation is also well understood as far as the CPU is concerned, but I have never been able to find any documentation on how the IR module interprets them. I started looking at the code some time ago, but there are at least a dozen different "instructions" used and it's probably going to be impossible to figure out what they do from just looking at the code.

Same here, it's a tough one to figure out...
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: (SOLVED) 41CL - DOUBLE HEPAX ACCESS and MMU CONFIG - Ángel Martin - 08-24-2019 10:26 PM



User(s) browsing this thread: 1 Guest(s)