[hpoj-devel] ptal-mlcd ECP changes

[<pa...@rc...>]

Hi,

I made some changes to ptal-mlcd affecting which IEEE1284 (parallel) modes
are now used for communicating with certain OfficeJets:
1. 500, 600, PSC300, 700, T series: bounded ECP mode forward and reverse,
2. C2890A, LX, 300 series: regular ECP mode forward, nibble mode reverse.

#1 should fix fairly repeatable ptal-hp scan failures I saw, where the
scan aborted in the middle and ptal-hp exited with a "Broken pipe" error.
A while back I asked if anybody else had seen this problem, and IIRC nobody
responded except for Joe Piolunek, saying he had never seen it.

#2 should hopefully make ptal-mlcd work reliably(?) with these older models,
although I won't officially consider them supported unless people who have
them help test the CVS code and let me know how well it works.

On a related note, ptal-mlcd now displays a warning message when it detects
a parallel port that isn't configured for ECP or bidirectional capability.
Hopefully that will take a lot of the guesswork out of troubleshooting a
relatively frequent source of problems with ptal-mlcd.  This warning is
suppressed if the "-porttype spp" switch is given.

David