Date   : Wed, 28 Dec 1983 14:08:50 EST
From   : Keith Petersen <w8sdz@brl>
Subject: MDM7xx overlay warning

Anyone who upgrades to MDM715 should be told that the patching
instructions in all the overlays are based upon the smaller
MDM712-713-714 programs.  Thanks to Bernie Eiben at DEC for pointing
this out and telling about a simple way to calculate the number of pages
to save.

--- forwarded message ---

Date: 28 Dec 1983 1214-EST
From: B.Eiben LCG Ext 617-467-4431 <EIBEN at DEC-MARLBORO>
To: w8sdz at BRL
Subject: MODEM-Overlays

Since MODEM has "grown" again, it might be usefull to update the "SAVE
66 MODEM.COM" to something like "SAVE 68 MODEM.COM" -- one otherwise
gets quite erratic behaviour... A "better" way would probably a short
explanation of the "magic":

To convert the HEX "NEXT" address printed by DDT or SID into the decimal
number You must give to the SAVE command in order to save the customized
MODEM-version to disk, use the following algorithm: first take the
leftmost two hex-digits and compute their decimal equivalent (e.g. 3C80
yields 3C, which is 60 decimal). Then, subtract 1 from that ONLY IF the
rightmost two digits are 00 (for example the 60 above would remain 60
because the rightmost two digits of 3C80 are 80, not 00 ). The final
value is the number to give to SAVE.   [Courtesy of BDS C Users-Guide,
Leor Zolman].

--- end of forwarded message ---