[sebhc] introduction

Peter Shkabara peter59 at sbcglobal.net
Wed Jun 29 10:51:21 CDT 2005

The CDR board is a RAM disk, a battery backed clock, and an optional SCSI
interface. There is no battery backup for the RAM disk, only for the clock.
To use the clock, there is software called DateStamper that can add date and
time to your files using the clock. I am not sure if DateStamper has been
released to public domain or not. I have source code for clock access
software since I developed this when I sold my own clock circuit as well as
being a reseller for CDR.

Disks marked CDR that are not readable by the H37 controller may be
formatted for the CDR Systems disk controller. This is a separate item from
the RAM disk/SCSI controller.

peter59 at sbcglobal.net

-----Original Message-----
The third machine has two half high 5.25 inch disk drives.  Many of those
disks that weren't readable in the first machine had "CDR" written on the
label, and I had no idea what that meant.  When I opened the third machine,
floating around inside the case was a two board sandwich that was made by
"CDR systems inc".  It contains a Z80 and what might be 1 MB of RAM.  THe
other big chips on it are a national semi DP8409AN-2 (which I think is a
dram controller), a national semi MM58167AN real time clock chip, and a
socket for a 40 pin device which is empty.  there is a 40 pin ribbon cable
from one of these CDR boards to the original Z80 socket on the main CPU
board.  The reason those boards and the other I/O cards were floating around
was that this machine is missing the card cages that should be holding in
those cards.  I guess I have found the first use for my parts machine.  :-)

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