@8EFD.ADF - SCSI Cached Disk/Diskette Controller
57F2716 SCSI ucode Intel D27512 -200 (sticker 57F2716, internally 57F2717) (DEAD)
Open DASD Module
Opened DASD Layout
HD Drive Shapes
Floppy Drive Stuff
DASD MODULE (#6222)
CR1 Run/Check LED
CR2 Drive in Use LED
F1 125V 1.5A Littelfuse
F2,3 125V 2A Littelfuse
J1 DB26 port for Setup Aid
J2 C60 port for SCSI
P1,2 Backplane connectors
P3,4,6 Drive power connections
P5 40-pin FD header (8570 style)
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
U33 SCSI BIOS Odd
U43 SCSI microcode 57F2716
U52 15F6903 SCSI Cache/data flow controller
U53 33F6715 SCSI MCA iface/BM DMA controller
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 triple-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.
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
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
the DASD Module
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
Note: If you left the
latches on, this will NOT
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
Floppy Drive Stuff
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
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
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
The important dimension is along the top. Take all
your measurements from that edge.The spacer is pictured
upside-down to emphasis the critical edge.
The 5mm slot can be a bit wider, the 12mm slot depth may
be deeper.Round off
all sharp corners.
AdapterID 8EFD SCSI Cached
SCSI Adapter Memory Location
Selects 32kb memory block used for
it's BIOS ROM. There are five memory ranges.
>(mem c0000-c7fff), C400 (c4000-cbfff), C800
(c8000-cffff), Segment CC00 (cc000-d3fff), D000
(d0000-d7fff), D400 (d4000-dbfff), D800 (d8000-dffff),
SCSI I/O Address
Choose the I/O address for each adapter
3540h-3547)>, 3548-354F, 3550-3557,
3558-355F, 3560-3567, 3568-356F, 3570-3577, 3578-357F
SCSI Arbitration Level
Select the arbitration level that SCSI will use
to transfer data.
<"Level C" (arb 12)>, D, E, 1, 3, 5, 6,
8, 9, A, B
SCSI Adapter Fairness On/Off
Whether the adapter releases control of the
bus when it has been using it exclusively.
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.
"4", "3", "2", "1", "0"
Address Burst Boundary
Determines the maximum number of bytes per burst
Boundary">, "32-Byte Boundary", "64-Byte
Boundary", "128-Byte Boundary"
Diskette DMA Arbitration Level
DMA channel diskette adapter will use to
level 2 only"
(ARB SharedArb 2)>
Diskette Adapter Fairness
Whether diskette adapter releases control
the bus when it has been using it exclusively.
Primary or secondary address range of the
03F0-03F7" (io 3F0-3f7 int 6)>,
"Alternate 0370-0377" (io 370-377 int 6)