Genesis 41 Emulator by Laurent Spohr

[Sylvain Cote]

So ... this is the procedure to transfer a program from Genesis-41 to a 41CL using RAMBox32 and the serial port.

Genesis-41 - Configuration Mode:

Code:

Show context menu → Select Memory Layout Managers -> ROM Layout ...
ROM Layout : Select page 8 - Load          -> RAMBOX32.ROM
ROM Layout : Select page 9 - Insert EEPROM -> EEPROM-9.ROM
ROM Layout : Close

Genesis-41 - Emulator Mode:

Code:

3                   // QROM XROM:3 (Y register)
9                   // QROM page   (X register)
"MY-PROGS 3C"       // ROM name
INITPG              // RB32 Init Page
CAT 2               // "MY-PROGS 3C" should be displayed at some point
                    // For each program that we want to copy from main RAM into QROM
"PROG1"             //   Enter program name in ALPHA
9                   //   Specify QROM page
LDPGM               //   RB32 Copy program from main RAM into QROM
                    // For-end
CAT 2               // When "MY-PROGS 3C" is displayed, press R/S, then ENTER and you should see all your programs that you have uploaded into QROM
9                   // QROM page   (X register)
"MP3C"              // ROM Revision (here: My Programs 3C)
ENDPG               // RB32 Close the page, save the ROM revision and calculate page checksum and write it to AFFFB-AFFFF, you should see "MP-3C BROKEN" at the end, it is normal
9                   // QROM page   (X register)
PGSUM               // RB32 Calculate page checksum, write it to AFFFF and display the result, you should see "PG:09  MP-3C"

Genesis-41 - Configuration Mode:

Code:

Show context menu → Select Memory Layout Managers -> ROM Layout ...
ROM Layout : Select page 9 -> Export → {to-your-working-directory}/mp3c.rom

On your 41CL

Code:

MMUDIS              // MMU Disable
MMUCLR              // MMU Clear, I always include this step in my procedures to avoid conflict with other configurations, but you can skip this line if you know what you are doing
"YFNX"              // 41CL Extreme Function ROM ID (XROM:15)
PLUG1L              // Plug module to page 8
                    // Plug your serial cable into your 41CL and into your computer before enabling the MMU
MMUEN               // MMU Enable 
SERINI              // Initialise 41CL serial port
48                  // Communication speed 4800 baud (X register)
PBAUD               // Activate comm speed
50                  // Speed up needed for data communication, otherwise buffer OVERWRITE message will show up and transfer will fail
PTURBO              // Activate 41CL 50x speed-up
"821000-0FFF"       // QROM address where the ROM image will go to and number of bytes to transfer
[XEQ][ALPHA]YIMP    // Ready ROM importation by partially entering the YIMP command and let it dangling

On your Mac, from the command line type:

Code:

cd {to-your-working-directory} [return]
java -jar clupdate-1.1.0.jar --upload mp3c.rom /dev/tty.usbserial 4800 [return]

You should see:

Code:

HH:MM:SS --upload    [fileName: mp3c.rom] [portName: /dev/tty.usbserial4] [baudRate: 4800]
HH:MM:SS File       mp3c.rom loading ...  done [YCRC=0x195F528A Rev:2021-06-22]
HH:MM:SS Serial     /dev/tty.usbserial4 opened.
HH:MM:SS Sleeping   5 seconds before starting file transfer

On your 41CL and within 5 seconds of seeing the sleeping message:

Code:

[ALPHA]             // Press ALPHA to complete YIMP command and start receiving the ROM image
"821"               // QROM address
YCRC                // Calculate CRC and verify that it match the one calculated on your computer (in my case: 195F528A)
"-821 9"            // Map a 4K QROM at address 0x821 to page 9
PPLUG               // Plug the module
CAT 2               // "MY-PROGS 3C" should be displayed at some point

You see, I told you, easy! ... well almost

Sylvain

Note 1: the above procedure was successfully tested with a 41CL v5, macOS Big Sur (11.4) and Java 11 (OpenJDK Runtime Environment AdoptOpenJDK, build 11.0.7+10)
Note 2: to see all the steps in one block, click on the "View a Printable Version" at the bottom of this page.

Edit 1: added {to-your-working-directory} tags
Edit 2: typos