7568 DASD Module
@8EFD.ADF - SCSI
Cached Disk/Diskette Controller
57F2716 SCSI ucode Intel D27512 -200 (sticker
says 57F2716, EPROM says 57F2717)
Open DASD Module
Opened DASD Layout
HD Drive Shapes Supported
Floppy Drive Stuff
DASD MODULE (#6222):
Drive in Use LED
F1 125v1.5A Littlefuse
F2,3 125v 2A Littlefuse
P1,2 Backplane connectors
P3,4,6 Drive power connections
P5 40 pin FD header (8570
P7 Unk 4 pin header
P8 SCSI connector
|U17,21 30 pin SIMM sockets
U22 SCSI BIOS Even
U29 Hitachi HM62256LFP-12T
U31 20.0 MHz osc
U37 OKI 15F7917
U43 57F2716 SCSI adapter
U57 24.0 MHz osc
U62 82077-1 Floppy controller
U63 Adaptec AIC-6250EL
The Disk Module consists of a double-wide shroud and
a Disk/Diskette Adapter Card. The Disk/Diskette Adapter Card contains
0.5MB of DASD Cache Memory (should take two 1MB Spock compatible 30 pin SIMMs),
and supports up to two 1.6" high 3.5" drives and a 1.44MB Diskette Drive
installed inside the shroud. The DASD Module has a C60 SCSI port
on the bottom and a tripple-row DB26 (floppy port for setup aid?).
SCSI BIOS Upgrade Ready
The upgrade SCSI BIOS chips for the SCSI and SCSI w/cache (92F2244/92F2245)
work in this board, and probably all others. If you look at the SCSI w/cache,
single oscillator, the parts are the same.
NOTE: PS/2 adapters should
not be installed in the slot #9 position. This is due to limitations with
setup and diagnostic code recognizing such adapters in that position.
The D40 (possibly C40 as well) support the 2.88MB floppy. It's
in the setup options...
Your C: MUST be set to ID6, a second HD MUST be set to ID5, as the
setup lacks selectable start sequence. The SCSI adapter itself is ID7.
Something I haven't seen- if you add an auxiliary DASD module
to slots 1 and 2, the drives must use ID0 to ID4. The drives within the Auxiliary
DASD module are considered as external SCSI devices.
Open the DASD
Folks, this is to help you keep your DASD module relatively unscarred.
Pull up on one of the ears and twist the latches out. (Important to remove
them!). Now go to the back of the module and undo the two catches.
Can't miss them. The DASD module is the only one to have them. Pull the cover
out. It will pivot on the two tabs at the front edge.
NOTE If you left the latches on,
this will NOT work.
Once you open the DASD up, the top swings back, held at the bottom
by the data and power cables.
The 7568 requires the squarish 0661/0662/0663 drives to fit
the 7568 specific drive rails. The mounting holes on the 1" high 0662 do
NOT match. You can drill a new pair of screw holes in the rails, but keep
this in mind- the on-board SCSI is 50 pin, so why not keep with the 0661/3
The drive in the 7568 is used in the Model 70, PN 15F7503. It is a
modified ALPS DFP723D12F with a PCB screwed in place on the top. The drive
that came with an 8570 has a clear plastic sled screwed on, but the same
PN 15F7503. Another 8570 drive is a Mitsubishi MF355C-599MB.
Some pictures stolen from Alfred Arnold's page:
Remove the Floppy Drive
Remove the clear plastic spacers between the drive latches. Unscrew
the two screws on the outside of the shroud (they screw into the FD's bottom!).
Spread the two sets of latches one side at a time, pulling up on the FD.
Once the FD rails are past the latch, pull it back and up.
The floppy rails are held on with two screws per side. The funky
thick black bezel will come off quite easily AFTER you unscrew the front
rail screw. Trust me. Do NOT try to pry the thick bezel off, it is rather
ready to fall off once the front screws are half way out.
The important dimension is along the top. Take all your measurements
from that edge.The spacer is pictured upside-down to emphasis the critical
The 5mm slot can be a bit wider, the 12mm slot depth may be deeper.Round off
all sharp corners.
8EFD SCSI Cached Disk/Diskette Controller
SCSI Adapter Memory Location
Selects a 32kb memory block which this adapter will use for
it's BIOS ROM. There are five memory ranges.
<"Segment C000" >(mem c0000-c7fff),
"Segment C400" (mem c4000-cbfff), "Segment C800" (mem c8000-cffff), "Segment
CC00", mem cc000-d3fff), "Segment D000" (mem d0000-d7fff), "Segment D400"
(mem d4000-dbfff), "Segment D800" (mem d8000-dffff), "ROM Disabled"
SCSI I/O Address
Choose the I/O address for each adapter
3540h-3547)>, "3548-354F" (io 3548-354F), "3550-3557"
(io 3550h-3557), "3558-355F" (io 3558-355F), "3560-3567" (io 3560-3567),
"3568-356F" (io 3568-356F), "3570-3577" (io 3570-3577), "3578-357F"
SCSI Arbitration Level
Select the arbitration level that SCSI will use to transfer data.
<"Level C" (arb 12)>,
"Level D" (arb 13), "Level E" (arb 14), "Level 1" (arb 1), "Level 3"
(arb 3), "Level 5" (arb 5", "Level 6" (arb 6), "Level 8" (arb
8), "Level 9" (arb 9), "Level A" (arb 10), "Level B" (arb 11)
SCSI Adapter Fairness On/Off
This controls whether the adapter will release control of the
bus when it has been using it exclusively.
<"On" >, "Off"
ROM Wait State Disable
Enable/Disable ROM Wait State
<"Enable Wait State">,
"No Wait State"
SCSI Adapter Address (ID)
Change the SCSI ID of the adapter.
<"7">, "6", "5",
"4", "3", "2", "1", "0"
Address Burst Boundary
Determines the maximum number of bytes per burst
< "No Boundary">,
"32-Byte Boundary", "64-Byte Boundary", "128-Byte Boundary"
Diskette DMA Arbitration Level
DMA channel the diskette adapter will use to transfer data.
<"Shared level 2 only"
(ARB SharedArb 2)>
Diskette Adapter Fairness On/Off
Controls whether the diskette adapter will release control of
the bus when it has been using it exclusively.
Diskette Primary/Alternate Addresses
Primary or secondary address range of the diskette portion.
(io 3F0-3f7 int 6)>, "Alternate 0370-0377" (io 370-377 int