DVR1 V1.52

Three changes were made in V1.52 since V1.50:

- When memory test gets too many errors, it now just aborts rather
  than skipping a few addresses and trying again.

- Optimized how tickle cop in delete routine to make erasing tracks faster.

- Changed so will print twice as often when filling memory for test and
  will print dots four times as often.  Increased speed of memory test.

- Figured out that the play_tracks command that was supposed to string
  tracks together so they appeared to be one track to the controller
  actually let the playing status line drop for in instant between tracks.
  This could cause the controller to think the DVR was done playing
  back the list of callsigns when checking public mailboxes before it
  was really done.

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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.

The V1.52 checksums are:

Memory 
Configuration          High (Even) Prom       Low (Odd) Prom
2x1                    831B                   D712
2x4                    83E7                   D83B
4x1                    81DB                   D8A9
4x4                    8001                   E0B9

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

Steve Strobel
Link Communications, Inc.
steve@link-comm.com
http://www.link-comm.com
(406) 245-5002 extension 102
(406) 245-4889 fax