====== Apple IIc Plus Secret Disk II SmartPort ======

In the course of disassembling the Apple IIc Plus firmware, I discovered a secret ProDOS block device and SmartPort implementation for the Disk II.

The implementation is complete, including read/write/format, minus a few bogus values in the SmartPort device information.

The entry points are:

^ Address ^ Implementation ^
| $C64E   | ProDOS Block Device |
| $C651   | SmartPort |

It is possible to replace the ProDOS 8 device driver address for slot 6 ($BF1C for drive 1, $BF2C for drive 2) with the block device driver address $C64E, and ProDOS will then operate the Disk II using the firmware driver.

I wrote up the discovery [[articles:iicplus_smartport_secrets|here]].