MCODE EPROM HARDWARE

[Sylvain Cote]

(08-26-2021 08:47 PM)Neve Wrote:  

(08-26-2021 07:12 PM)Sylvain Cote Wrote:  For the 41CL, you just need to initialize a 41CL internal RAM page with 0x00 and then map that page to the 41 memory space (page 6 to 15).

Thanks, I’ll have to look into that…

Example with one 4K QROM (RAM 10 bits), ZenROM & YFNX:

Code:

MMUDIS          // disable MMU
MMUCLR          // clear MMU
"YFNX"          // 41CL Extreme ROM
PLUG1L          // plug it to page 8
"ZENR"          // ZenROM
PLUG1U          // plug it to page 9
MMUEN           // enable MMU
"830000-0000"   // 4K word RAM at 41CL internal page 0x830000
YMCLR           // write 0x00 from 0x830000 to 0x830FFF
"-830 A"        // map 4K RAM internal page 0x830 to 41OS page 10
PPLUG           // plug 4K RAM to page 10

... then you can use MCED from ZenROM to directly edit the 4K RAM page.

(08-26-2021 08:47 PM)Neve Wrote:  

(08-26-2021 07:12 PM)Sylvain Cote Wrote:  There are several PC nut assembler available that can generate 4K MCODE modules.

Names of those PC nut assemblers? Where can I find these?

Available on TOS

• SDS II, by Hewlett-Packard, runs on MS-DOS
• SDK41, by Warren Furlow, runs on MS-DOS
• asmnut, by Christophe Gottheimer, run Linux & Win32+Cygwin
• NutStudio, by Håkan Thörngren, run on Linux & macOS
• ... you can probably find more if you search the Internet
  

(08-26-2021 08:47 PM)Neve Wrote:  

(08-26-2021 07:12 PM)Sylvain Cote Wrote:  Look at my HPCC 2020 presentation on Diego's modules, it should gives you some answers to your questions.

Watching it now. It’ll probably raise even more questions!

Anytime!