w8sdz%brl@sri-unix.UUCP (12/28/83)
From: Keith Petersen <w8sdz@brl> 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 ---