b-davis@utah-cs.UUCP (Brad Davis) (07/27/85)
I friend of mine received this letter a couple of months ago. I thought
it might be of interest.
Brad Davis
{ihnp4, decvax, seismo}!utah-cs!b-davis
b-davis@utah-cs.ARPA
------------------------------------------------------------------------
April 23, 1985
Dear Independent Developer:
A secondary theme of all our Personal Computer Technical Seminars has
been compatibility. In the seminar proceedings, we have devoted
complete articles in Version 1.1 August 1983, Version 1.2 September
1983, Version 1.3 November 1983, and Version 2.4 August 1984, to
compatibility guidelines. In these articles we have stressed the need
to use the program interfaces of the BIOS, which is listed in the
respective Technical Reference Manuals, and the operating system to
ensure that applications will execute successfully across all members of
the family of IBM Personal Computers.
However, it has been brought to our attention that some products have
been developed using a copy protection implementation which uses
diskette tracks beyond the published and supported tracks zero (0) to
thirty-nine (39). We are now delivering systems which inhibit writing
beyond track thirty-nine and this has created a problem for the
previously mentioned products. The use of tracks beyond track
thirty-nine is not supported by IBM, therefore we encourage you to
determine whether the operation of your products has been impacted.
It is important to follow the published specifications and compatibility
guidelines to insure that your applications continue to execute
successfully on the family of IBM Personal Computers.
Sincerely,
<signed>
G. L. Geltz, Manager
Independent Developer Relations
GLG/pjp
--
Brad Davis
{ihnp4, decvax, seismo}!utah-cs!b-davis
b-davis@utah-cs.ARPA