The HP3458A MREAD command returns a 16 bit value as a decimal integer. The 2kB cal SRAM is only 8 bits wide and the values are returned in the high byte. On two of my machines the low byte is always B9 hex. One the other one (earlier serial number) it is always FF.

-------- In message <BLU170-W25AD7ABFFDEFA96E92F6FCCEEB0@phx.gbl>, Mark Sims writes: >The HP3458A MREAD command returns a 16 bit value as a decimal >integer. The 2kB cal SRAM is only 8 bits wide and the values are >returned in the high byte. On two of my machines the low byte is >always B9 hex. One the other one (earlier serial number) it is >always FF. I belive that depends on what happened previously on the data-bus of the M68K cpu. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.