HP-41 Cataiog Enhancement Conflict OS/X vs HP-IL DEV+

[Sylvain Cote]

(04-29-2024 11:55 AM)PeterP Wrote:  BitWiz, quick question - is the Zenrom a bank-switched rom? If not, maybe you could switch it with the IL Dev+ so that it is in a higher page than the OSX+?

ZENROM is not bank switched and is only 4K.

The NoV module has 64K 10-bit FRAM that can be used as HEPAX RAM or as QROM.
That FRAM space is divided into 4 blocks of 16K.
One of the blocks is always mapped to pages 8 to 11 and a second block can also me mapped to pages 12 to 15.
The 4100 control word control which block is active and to where it is mapped.

Mike wants to use the FRAM part as a personality space and use the Flash part for the common ROMs.
I do not know if he plan to use the Flash part as a unified block of 48K or as two blocks of 24K, I will assume the unified option.

In his listing ...
NoV 48K Flash (pages 4, 12 to 15) has: Library4, OSX, 16C, NoV CHAP and ZENROM
NoV 16K FRAM block #1 (pages 8 to 11) is for HP-IL personality: Extended IL, HP-IL Dev+, etc.
NoV 16K FRAM block #2 (pages 8 to 11) is currently undefined
NoV 16K FRAM block #3 (pages 8 to 11) is currently undefined
NoV 16K FRAM block #4 (pages 8 to 11) is currently undefined
Pages 6 & 7 is reserved for the HP-IL module.

Mike goal here is to use the NoV module as an Advanced MLDL box and not as an Advanced HEPAX clone.

edit: and he is using the NoV Chap ROM and/or the ZenROM to change the 4100 control word content.