3 Apr
1998
3 Apr
'98
8:56 p.m.
I may be wrong, but I thought the RL01/RL02
needed a seek to even switch
heads to guarantee the #0 and #1 head were on cyl when reading/writing.
Anyone else have any recollections/driver sources?
According to the RL tech manual...
Disk Address Register During Read or Write Data Command
---
...
Bit 6 Head Select Indicates which head (disk surface) is to be selected.
A 1 indicates the lower head, a 0 the upper head. The
correct track (_head_ and cylinder) must have been
previously selected by a seek.
I've just looked in the RL01 printset (the RL02 must be similar), and the
head select signal comes from a register that only seems to be loaded on
a seek command. So you _do_ need to do a 'seek' to change heads.
Bill
Hope that helps
-tony