From: ferret@gnh-cathouse.cts.com (Brendan Hoar)
Newsgroups: comp.sys.apple2
Subject: GS & CTS...
Date: 9 Oct 92 21:23:02 GMT
Distribution: world
Organization: The Internet
X-Unparsable-Date: Thu Oct 08 92 at 21:28:19 (EST)

Note:  If you bought ProTerm 3.0 and have also sent in your registration card,
PLEASE give the InSync BBS a call and request access to the transfer area so
you can download the latest (as of late Semptember) bug fixes.  Lotsa bugs
stomped, more drivers, code improve/optimized.

On to my problem:

I was having no luck getting ProTerm 3.0 to recognize when my ZyXEL dropped
CTS - in other words, Zmodem uploads were a nigthmare.  PT3 just would send
and send until it received a ZRPOS error and would go back about 80% of the
way & start sending again.  Ick.  I was using the most recent versions of the
Apple IIGS Modem Port (GS/OS) port driver and the Okidata 9600 (RTS/CTS)
driver with appropriate init string modifications for my modem & a modem
cable that matches the pinout in the PT3 manual

Turns out it wasn't a software problem.  Anyone (especially from Apple if you
happen to see this message) know why it is that one GS won't recognize the CTS
signal and the other will?  See below.

---

Board 12: 248 of 250
 Subject: CTS problem resolved (ZyXEL)
    From: BRENDAN HOAR [#503]
  Posted: 10/07/92 at 16:59:13
  Thread: /HOAR
 
Greg,
 
The problem with CTS is resolved (kind of):
 
Swapped my motherboard.  CTS is now tracked.  Same modem, cable, version of
PT3, install string, etc.  Same cards as before (including a Zip 10/64split)
 
Worthy of Note:
 
Serial chip on...                       (bar represents newline)
Old GS:  Zilog|Z8530VS|SCC|8705
New GS:  Zilog|Z0853004VSC|SCC|8817
 
Both are standard post-Woz GS ROM 01s (the first was a ROM 00 that was
upgraded) - the first one's model # ends with an 'A' - the second one's model #
ends with a 'D'.
 
Maybe its possible that there are more than one ROM 01 types out there that
aren't completely compatible?  Or maybe the older Zilog chip has a bad trace on
the chip?
 
Interesting, eh?
 
Board 12: 250 of 250
 Subject: Possible 8530 Problems
    From: GREG SCHAEFER [#3]
  Posted: 10/08/92 at 11:33:44
  Thread: /SCHAEFER
 
Brendan: I am certainly glad your problem is resolved, however the solution is
almost as scary as the problem. I have not heard of any problems in different
versions of the 8530, but I will take a look in my docs. My own machine is a
"woz" edition //gs and it works fine. Obviously if the problem is in the chip,
it was a batch used in the middle of the production run. Another possibility is
that the CTS serial driver was bad. I guess the only way to really know for
sure would have been to put a logic probe on the CTS pin on the 8530 on your
old motherboard. Another good check might have been to try connecting the modem
to the printer port. Since I never considered hardware problems as a
possibility, I didnt suggest that. If I find any definate information regarding
different versions on the 8530, I will post it.

Greg Schaefer @ InSync Software, Inc.
 
---

Anyway, when I say I swapped motherboards, let me make it clear.  I took all
the cards & peripherals from one machine & installed them in the other.  This
includes the processor (on the Zip), but not the power supply & case.  The
hard disk was moved over as well, so the software is installed IDENTICALLY.  I
also am sure that the problem was not a loose cable on the original
motherboard's serial port.  Somewhere between the modem port and the part
of the SCC that generates an interrupt when the CTS signal goes low, something
is awry.  Maybe the earlier SCC requires a different setup than the one that
PT3 gives it.  <shrug>

Any clues as to why this is happening?

I'm going to dig out my logic probe (NJP) this weekend and take a look at it. 
I may also take the time to try using the Apple IIGS Printer Port driver as
well on the older machine.

Thanks for any and all help.

(Replies get to me faster if sent to BrendanHr@aol.com or alternately
Brendan_Hoar@notes.pw.com if it is before 2:30pm on a weekday)

sig--v
____________  
Loc.|Address|___What are we?___ 5 billion pieces   Downtime this is downtime
Work|Brendan_Hoar@notes.pw.com|____so defined____  but we're fixing nothing...
Play|badbunny@gnh-starport.cts.com (703) 998-5687| just watching plate & fire,
IPay|BrendanHr@aol.com___________________________| the burn first touching.