

Jameco MFM/FM Hardwiring Update for Early JE-1043 Boards.

In the process of unpacking, I discovered an earlier Version of the Jameco JE-1043 FDC
card that has a hardwired modification. The Hardware modification adds a LS7404N
stacked on top of the IC at U23. ONLY Pins 14 and 7 are soldered to the IC U23, and
all other Pins are bent away from the Pins of U23.

There is a wire from Z80 FDC Z0765 U25 Pin 26 to the added LS7404N Pin 13.
FDC9216B has Pin 5 Bent out so it does not go into the IC Socket. There is a wire
from LS7404N Pin 12 to FDC 9216B U24 Pin 5.

I haven't located any files with this Modification Information. Photo's are attached.
My PCloud has been updated, with this information.

Does anyone have the Jameco Documentation for this MFM/FM Update?


Larry   (ldkraemer at the Vintage Computer Federation Forums)


