PIL-Box throughput

[Dave Frederickson]

(07-14-2015 05:09 PM)Christoph Giesselink Wrote:  Just checked the behavior of ROMCOPY by enabling the Scope in ILPer and executing the command:

ROMCOPY :PORT(1) TO RCPYLEX:HP ;ROMSIZE=32768

Result:

• the data bytes are transferred only once
• the last commands before the data bytes are LAD 02 UNT
  

-> the disc simulation is listener at data transmission, so no verify read

I'm still puzzled by this behavior. I turned on the Scope prior to executing the ROMCOPY command and was surprised that it was silent for around half a minute, then started spitting out data bytes.

I suspect what ROMCOPY is doing during Writes is calculating the checksums first, hence the quiet HP-IL bus, and that accounts for the difference between reading and writing.

Dave