What's CIS for? (was RE: Original 11/74 front panel)

CIS stands for Commercial Instruction Set. The chip adds new "instruction opcodes" to the processor. AFAIK it is of little use, unless you have COBOL programs, or do a lot of string manipulations, and then of course it is only used if the program recognizes it. That's about what I know. I have the chip here too, but never thought of installing it, because it will draw power, generate some extra heat, and that's about it. But I keep the chip, it's a bit rare, and because of its looks :-) - Henk, PA8PDP. ________________________________ Van: cctalk-bounces at classiccmp.org namens Julian Wolfe Verzonden: vr 10-02-2006 19:09 Aan: 'General Discussion: On-Topic and Off-Topic Posts' Onderwerp: What's CIS for? (was RE: Original 11/74 front panel) Speaking of CIS, can anyone point me to a good document as to what the benefits of CIS are? I've often wondered what this is about, as it's a plug-in chip on my 11/23+ This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.