(Pro/Auto/AutoPro)
The Allegro I controller from Micro System Designs, Inc., formats and writes
to the diskette at the same time. This results in a faster duplication speed
when writing to unformatted media and also improves the copy quality by
removing the write splices between the data sectors of the diskette.
When using the Allegro I controller, make sure that "Format" is set to
"Always"
to enable the format-with-write feature.
The Allegro I SDS controller card comes pre-set with the recommended default
jumper settings.
For the single cable Y-E Data SDS interface:
No jumpers need to be set (make sure that the "C1 SDS CONFIG" jumper is set
to YE DA).
For SDS drives using the ALF single cable interface:
Set the "C1 SDS CONFIG." jumper to 'ALF'.
For a two cable SDS interface:
Set the "C1 SDS CONFIG." jumper to 'NORM'.
Attach the "Head 1 Adapter" cable (included with Allegro 1)
to "C2" on the Allegro I board (See Figure).
The Allegro I can also be used with non-SDS drives with the "C1 SDS CONFIG"
jumper set to 'NORM'.
Default Jumper Settings for the Allegro I:
ADDRESS:
INDEX:
C1 SDS CONFIG:
FDC1:
FDC2:
|
370
SDS
NORM or YE DA or ALF
IRQ 6, DMA 2
no IRQ, DMA 3
|
Note:
There are always three DMA jumpers per controller. For SDS drives, FDC1
should not be jumpered to use the same DMA channel as FDC2.
For SDS drives, the interrupt for FDC2 is left unjumpered. The only case
where FDC2 would have an interrupt is when a non-SDS drive is connected to
the C2 connector. FDC1 should be jumpered to use interrupt 6.
