It's a 6800 with a biphase 1.25-MHz clock. It is likely to be tricky to upgrade the CPU because you don't necessarily know if there are any critical loops that depend on a particular clock cycle time.
There's a disassembler here (M68DIS): http://www.simtel.net/category.php%5Bid%5D73%5BSiteID%5Dfilebasket I've used it to delve into the Tek 490-series ROMs a bit. Also, in time-interval mode, there is a "computer dump" mode that allows you to make measurements much faster by moving the vernier calculations to the host. The count-chain outputs are returned in a 5-byte binary block. In measurements that take the mean or std dev of a lot of readings, it's tough to say whether it's faster to let the CPU do the math or send each reading to the host on an individual basis. Would be interesting to try. -- john, KE5FX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Jack Hudler > Sent: Thursday, February 22, 2007 5:35 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] Fine print on HP 5334B > > > Wow that's an easy 8bit instruction set. > If someone dumped the EEPROM's I could whip up a disassembler. They even > have a 6800 simulator on sourceforge. > But, that would be the easy part, now you'd have to understand what it's > doing and why. > Of course some HP benefactor could accidently send the source... > > Jack > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
