stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51/4

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Fri Apr 9 15:11:48 1999

At 12:31 PM 4/9/99 -0700, Derek Peschel wrote:
>I mentioned that CP/M has similar capabilities. I didn't mention that it's
>more cryptic. A message simply appears:
>
>Bdos Err on A: Bad Sector

This only occurred if your BIOS was too stupid. In the BIOS I wrote for the
16FDC (Cromemco) when a disk eror was "hard" (that is some number of
retries failed to achieve a successful read) I sent a message to the
console asking the user what they wanted to do at that point, they could:
        1) return zeros
        2) return the error code and get the BDOS message
        3) Warmstart
        4) Reboot
        5) Try again

--Chuck
Received on Fri Apr 09 1999 - 15:11:48 BST