Benchmarks 71B versus 48GX

[KimH]

I did not know about the 1MHz auction, but I made a couple of them myself.

The Diagnostic/Service ROM helped me validate how far to push the Clock

I recall that a good indication would be a serial# later than 2623, but opening the case and checking is the best way to determine the CPU version.

/KimH

(06-17-2020 12:19 PM)Dave Frederickson Wrote:  

(06-17-2020 11:43 AM)KimH Wrote:  Actually, the later 71B has the refreshed 1LK7 CPU.

According to legend HP always wanted the chip to run a 1MHz Clock, but something went wrong and they ended up with 650KHz which is the 1LF2.

In later years - i think mid 86, they started to mount the 1LK7 on the PCB.

There is no way - that I know - to see the actual CPU version without opening the Case.

If it is 1LK7, the LC circuit can be modified to run at about 1MHz - at about 1.1MHz the CPU starts to become unreliable.

Did you win the auction for the 1MHz 71B on eBay?

Does the introduction of the 1LK7 correspond to the change is case style or an update from 1BBBB?

Dave