HP Forum Archive 19

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Obscure 41 Module - FAC/WC Message #1 Posted by Angel Martin on 25 Apr 2009, 12:56 p.m. I just got a 41 module that seems to be peculiar enough / even if it's only because of its capacity. It's the "Forward Air Controller / Wind Correction" (FAC/W). It appears to have 16k of ROM, a little unusual for a single module of the old generation - possibly a Zeprom?? Does anybody have any information on this peculiar little thing? Needless to say I have no manual or any overlay (if any existed). I suposse I should get a hex dump (disassembly) of the three bottom pages. It does have an automatic key assignment upon CALC_ON vector though. Best, AM

Re: Obscure 41 Module - FAC/WC Message #2 Posted by Dan Grelinger on 27 Apr 2009, 11:24 p.m., in response to message #1 by Angel Martin I've looked at one of those. It is not a ZEPROM. It is a CMT-10, (16K version) and is reprogramable, with the right equipment and software.

Re: Obscure 41 Module - FAC/WC Message #3 Posted by Ángel Martin on 28 Apr 2009, 8:59 a.m., in response to message #2 by Dan Grelinger Thanks for the info, Dan. This ROM has some interesting aspects to it, starting with the 16k configuration. Only the first (lowest) page has a proper FAT to it, while the next two have a single "DUMMY" function on their FAT's - and none for the highest one. I suppose they must be holding table-like data, shame they didn't implement a bank-switched configuration to save address space. Best, ÁM

Re: Obscure 41 Module - FAC/WC Message #4 Posted by Dan Grelinger on 28 Apr 2009, 9:55 a.m., in response to message #3 by Ángel Martin The ZEPROM was a much better design, I think it was introduced after the CMT-10. The CMT-10 came in a 16K bank-switched version, too (called the 16B). As far as I know, the two different CMT 16K versions were fixed from the factory, either bank-switched or not, and could not be changed in the field. There are other modules that have a FAT only in the lower page. One that HP produced was the navigation module. I think the Real Estate module was another HP rom that was 8K and had no rom header in the second page.

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