DVR1 V1.54

Analog Devices quit making the AD1848 chip that was used in the 
DVR-1 for years, replacing it with the supposedly backward compatible
AD1845.  Unfortunately, the AD1845 doesn't work with firmware version
1.52 (or probably earlier versions).  V1.54 contains a few changes that 
allow it to work with the AD1845.  It is otherwise unchanged.  V1.54 
has not be thouroughly tested with the AD1848, so if your DVR has that 
chip, please use V1.52 instead.

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This zip file contains the files needed to burn your own eproms for
the DVR1.  There are four separate versions, one for each possible
memory configuration.  You must use the proper version to make full
use of the memory you have installed.  The filenames begin with YxZ...
where y is the number of simms (2 or 4) and Z is the size of each
simm in megabytes (1 or 4).  The total amount of memory is obviously
Y times Z, and the total amount of record time is about two minutes
per megabyte.  You will need to burn two roms, one for the
high byte and one for the low byte.  The filenames end in H or L to
indicate high byte or low byte.  If you forget which socket in the
DVR is which, the socket closest to the connectors is the low byte.

Each *.bin file should be loaded into an eprom programmer as 
a binary file with no offset and burned into a 27C010 or 27C001 
eprom.  Note that only the first few kilobytes of the eprom will 
have any data in it - this is normal.

If you have any questions or problems, please contact us.

Link Communications, Inc.
info@link-comm.com
http://www.link-comm.com
(406) 245-5002
(406) 245-4889 fax