7
Setting the FLASH Reset Behavior
The Flash Bank Selection Register (FBSR) is located at offset $09 from the base address of the
interface. At power-up, this register holds the value of DIP Switches 2-3, which determine which of
the four banks of 16K appear in the CoCo’s ROM space at $C000. Software can modify the value in
this register to automatically select a different bank of FLASH.
If jumper pair 1-2 contains a shunt, then the contents of the FBSR will remain the same even through
hardware reset, and only a power cycle will cause the FBSR value to change back to the DIP switch
settings.
If jumper pair 1-2 does NOT contain a shunt, then contents of the FBSR are reset to the state of the
DIP switches upon pressing the RESET button.
For a CoCo 1 or CoCo 2, we recommend that you keep the shunt ON, since these Color Computers
run from ROM. Hence, pressing the RESET button insures that the last value written to the FBSR
remains, and that the corresponding FLASH bank stays mapped into memory space.
Connecting to the CoCo
Now, it’s time to connect the miniFLASH to your Color Computer. Be sure that power is OFF on your
Color Computer and your Multi-Pak, then insert the miniFLASH is in slot 3. Your floppy disk controller
should reside in slot 4.
Once the controllers are firmly in place, turn on your Multi-Pak and then your Color Computer.
Summary of Contents for miniFLASH
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