From: Greg King (greg.king4_at_verizon.net)
Date: 2008-10-14 18:00:14
From: ruud.baltissen; on Thursday, July 31, 2008; 05:42 AM -0400
>
> The next delay is the one for stepping the head. As I don't use any head-
> stepping at all, I simply removed all routines. But, Gideon's 'floppy
> drive' does act on the state of the outputs of the 6522; and so, I need at
> least the routines that output the signals for the stepping motor.
> There is a routine for fast-stepping the head and one for slow-stepping.
> The actual decision is made at $FA0E where the number of steps is
> compared with MINSTP ($0064). MINSTP is filled with the value $C8 = 200
> at position $F2A4. Whatever the original input is, at $FA0E, register A
> is a number where bit 7 _always_ = zero. And therefore, A never can be
> greater then $C8; and thus, the fast-stepping routine never is executed.
>
> Or, am I wrong?
My reply is months late; but, I must ask:
Doesn't 200 steps move the head by 100 tracks? Why would that code be on
machines that have less than 100 tracks?
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