12 Nov
2011
12 Nov
'11
11:46 a.m.
On Fri, Nov 11, 2011 at 4:45 PM, David Riley <fraveydank at gmail.com> wrote:
If I run the thing without the EEPROM in (I saw
provisions for a blank/absent chip in the 8086 code, so I figured I'd give it a shot)
it works! ?The serial port works as expected now, too. ?The EEPROM holds some information
necessary for running, like the LUN offset and some disk/tape configuration options that I
haven't work out yet (though defaults are loaded if the EEPROM doesn't come up
right). ?Given the amount of fallback for absent EEPROMs, I should probably be able to get
this thing to run without one for the time being.
Have you dug into the firmware enough to figure out where the serial
number is stored? My guess is that the serial number is stored
somewhere in the EEPROM. I wonder if the firmware provides any
mechanism to set the serial number in the EEPROM, or if the serial
number needs to be programmed into the EEPROM before it is installed
in the board.
I have at least one CQD-220 (or maybe it's a CQD-200?) that appears to
have lost its serial number after I swapped firmware and maybe when
changing it from a /T or /M to a /TM. It doesn't affect the operation
at all, but it would be interesting to restore the serial number if
there is an easy way to do that.
-Glen