vxb@mhuxh.UUCP (BRADNER) (09/21/86)
I have been having some difficulty using Symphony version 1.1 on an AT&T
PC6300 Plus running MSDOS 3.1.
Symphony, at times, thinks that the 8087 numeric co-processor chip is
available when in fact none is resident. This doesn't happen on all
Pc6300 Plus's and when it does, it is sporatic on some machines.
There is a dip switch on the PC6300 Plus for indicating the 8087 but
the switch setting doesn't seem to effect Symphony.
Can anyone tell me what I am doing wrong (or else that there is a compatibility
problem with Symphony on the PC6300 Plus)?
Thanks in advance for any suggestions on how I can get around this.
Vern Bradner
{ihnp4,seismo!akgua}!mhuxh!vxblowe@psuvax1.UUCP (Tom Lowe) (09/29/86)
In article <829@mhuxh.UUCP> vxb@mhuxh.UUCP (BRADNER) writes: >I have been having some difficulty using Symphony version 1.1 on an AT&T >PC6300 Plus running MSDOS 3.1. > >Symphony, at times, thinks that the 8087 numeric co-processor chip is >available when in fact none is resident. This doesn't happen on all >Pc6300 Plus's and when it does, it is sporatic on some machines. >There is a dip switch on the PC6300 Plus for indicating the 8087 but >the switch setting doesn't seem to effect Symphony. > >Can anyone tell me what I am doing wrong (or else that there is a compatibility >problem with Symphony on the PC6300 Plus)? > >Thanks in advance for any suggestions on how I can get around this. > > Vern Bradner > :ihnp4,seismo!akgua:!mhuxh!vxb Some versions of LOTUS and related programs had a bug in them that actually went to the port containing the 80287 chip and checked the levels of a couple pins. If there was no 80287 chip there, it wouldn't see the levels it should see. Thus AT&T started installing a chip called a spider chip. It is basically a socket header that had three components that took appropriate pins to the electronic levels expected for no 80287 chip. When you get a 80287 chip, you would simply replace the spider chip and flip a switch. If your machine doesn't have this spider chip, and you don't have an 80287 chip, call the AT&T Hotline at 800-922-0354. They will send you one. --Tom Lowe