I suspect more like a signature byte, I think the boot-up to the SHELL menu is too quick to do a CRC check on each ROM every time it boots up.
PS. Even though Self Test doesn't show PAKs 6, 7, 14 & 15 PC85 still checks for and will display in the full menu list, even PAK's 6, 7, 14 & 15.
The only one it will not display is Pak 10 which is reserved for the Menu expansion of SHELL.
Ernest
PS. Even though Self Test doesn't show PAKs 6, 7, 14 & 15 PC85 still checks for and will display in the full menu list, even PAK's 6, 7, 14 & 15.
The only one it will not display is Pak 10 which is reserved for the Menu expansion of SHELL.
Ernest