HP-71B Startup Time - ROM Differences

[J-F Garnier]

(09-09-2014 08:14 AM)Paul Dale Wrote:  Try it with the HP IL module unplugged. I noticed that the 71B starts a lot slower with an IL module without cable. Unless you are in CALC mode in which case there was no difference.
- Pauli

(09-09-2014 12:48 PM)rprosperi Wrote:  Though I regularly use PRINTER IS :PRINTER(2) to direct output to ILPer, I don't recall using DISPLAY IS. Could PRINTER IS also cause the same issue as DISPLAY IS (presumably the 71 is trying to access the 'current' device and eventually times-out)?

The DISPLAY IS :DISPLAY is the default power-up state (first insertion) of the HP-IL module. So unless an explicit DISPLAY IS * is done, the HP-71B will search for a display at every turn-on, even if the loop is open or broken, causing a delay. PRINTER IS will not cause any problem, until you do a printer operation (PRINT, PLIST, ...).