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DD8
plus Version 2.20 - September 1998
INSTALLING BUFFER RAM EXPANSION
The DD8’s internal buffer RAM memory can be expanded by installing one EDO SIMM RAM
board in the slot labelled J6. Installation is fairly simple. The SIMMs board is inserted to the slot
at a slight angle and then pushed back where it clips into place. Because SIMMs boards can
differ, it is not possible to say “Install them with the components facing the front of the DD8” or
anything like that because some SIMMs boards have the memory chips mounted on both sides
sometimes. However, the boards can only be inserted one way so you shouldn’t have any prob-
lems but be careful not to force them into place otherwise they may snap.
INSTALLING EQ8 EQUALISER BOARD
The DD8 can support the EQ8 equaliser board to maintain data compatibility with disks which
have been created by the DR8, DR16 or DD1500 with an EQ board.
Remove the four screws on the CPU P.C. Board and replace them with the four mounting posts
provided with the EQ8 package. Place the EQ8 board and connect its connector to the connec-
tor (J3) on the CPU P.C. Board. Then fix it with the four screws removed previously.
Please note that it is not possible to adjust the EQ parameters from the DD8 itself. This board is
just to maintain data compatibility.
INSTALLING INTERNAL DISK DRIVE
A Disk Drive can be mounted inside the DD8. The SCSI disk drives that can be mounted inter-
nally are 5.25-inch half height MO Drives, 5.25-inch half height Removable HD Cart Bays or any
other removable media drives with an adapter to cover the 5.25-inch half height opening.
Remove the Front Panel by loosening the six screws on its top and bottom (3 screws each) then
take the mask cover off for the drive bay opening by pressing it from the front (assuming the top
and bottom covers have been removed already). Then place the Front Panel back on and tighten
the screws. (Please make sure that there’s no dust in between the screen or meters and the
windows.)
Insert (slide in) the drive bay from the front and fix it with the four screws provided from the
bottom (The different screws are required depending on the drive, one is mm-threaded and the
other is inch-threaded. Use the appropriate screws.). Then connect the 50-pin SCSI cable be-
tween the SCSI connector on the drive unit and the P202 connector on the CPU P.C. Board.
Also, connect the 4-pin power cable between the Power Connector on the drive and P2 on the
Control P.C. Board (located on the top side). The necessary screws and cables are packaged
separately in the DD8 box.
APPENDIX - 2