HP-71B Enhanced Math LEX

[Erwin]

(08-11-2020 05:17 PM)Dave Frederickson Wrote:  Hi Erwin,

If the goal is to configure FRAM71 with a Math ROM image I would normally suggest using the binary image, however, the binary image in the Math 2b distribution pack is NOT a ROM image but an IRAM image. So, if you want to try loading an image into FRAM71 using ROMCOPY you'll need to create a ROM image.

You can do this starting with the IRAM image, TITANCHK, and a hex editor. Knowing that the checksum for the first 16k is in byte 4 and the checksum for the last 16k is the last byte, you can manipulate the image to pass TITANCHK and load it using ROMCOPY. Then you should convert the RAM to ROM by POKEing the FRAM71 config string.

Dave

Thanks a lot Dave … so I have to try to find a Windows PC for that … I‘ll try it the next time and will report the result here.

regards
Erwin