Altair FDC+ Firmware Release v1.4

Discuss construction, troubleshooting, and operation of the Altair 8800c computer

Altair FDC+ Firmware Release v1.4

Postby AltairClone » January 23rd, 2021, 12:31 pm

Version 1.4 of the firmware for the Altair FDC+ disk controller has been released. The only change is to drive type 1, Shugart 8" as Altair 8".

In the FDC+ monitor menu for drive type 1 under "Drive Timing Parameters->Drive Index Timing," the 0us menu option has been changed:

1) The text "(for Pertec drives)" has been added to the 0us option.
2) The actual timing adjustment used by the system is now 8us instead of 0us because the timing adjustment must be greater than zero to function properly.

The primary purpose of the 0us option is to allow use of the Pertec FD514 drive. This drive has a Shugart compatible interface so it can be used with the drive type 1 selection on the FDC+. However, since it is a Pertec drive, it does not require the 360us index adjustment that the Shugart (and other Shugart compatible drives) require in order to duplicate the index timing of a Pertec drive.

The update can be found here: https://deramp.com/downloads/altair/hardware/fdc+/

Mike
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