Jim (and others)

Thanks for that.  I did the mod (my serial cable is starting to look like
frankenstein's monster, with a DB-9, two DIN-8's, and a switch all spliced
together) and on the surface the thing appears to work.

Here's what happens when I type in the whole alphabet (lowercase first, then
uppercase) at 19200.

cdefghiqBQT

The letters received match the ones typed in, which is reassuring.

In MacPIC, I can do a blank check but anything else generates a "Serial port
I/O error".  This means that at least the mac is talking to the programmer.
Disconnecting the programmer immediately generates a "PICStart Plus not
found on serial port" which means that at least the computer can figure out
that the programmer is connected.

It seems to be a problem that is related to time - the longer the computer
and board talk to each other, the more chance of an error.

I tried using MPLab in my PC emulator and got much the same results - the
computer found the programmer, but had trouble receiving messages from it.
Disconnecting the programmer immediately generated a "programmer not found"
message.

I'm going to put a MAX-232 in between the computer and programmer, and see
how that goes.  I'll make a webpage to show what to do when I get it
working.

Ben Hitchcock

>From: Jim Robertson <newfound@PIPELINE.COM.AU>
>At 17:50 8/10/99 +0000, you wrote:
>
>Ben,
>
>As I told you over the phone this MACPIC is not something I can help with
>as it
>is not my baby. However I can tell you that you certainly need to use the
>resistor mod on the cable as the MAC serial port is not RS232 but RS
>something,
>something, something  with the differential voltage levels. The resistor
>forms a voltage divider required to generate differential levels from the
>GND to
>5V levels generated from the warp-13.
>
>
>Typing in "a" should not bring a response from the warp-13. It is not
>part of any of the protocols and it is ignored. Type ALT-128 (on the
>numeric keypad) and you should receive either , (or * depending on the
>firmware version)
>
>Jim
>
>
>
>>Hi,
>>
>>Has anyone used the warp-13 with MacPIC?  I just got my warp-13 and am
>>having troubles communicating with it.  A communications program gives weird
>>results:  Here's a screendump when I typed the letter "a" repeatedly:
>>
>>XXXXXxXXXXXxxXXXXXxXXXXXXXXXXXXXXXXXXXXXXXXXXXXxxxXXXXaXXXxXXxXXxXXxxXXXX
>>
>>Hmmm... Not very repeatable.  Do I need to do the resistor mods to the
>>cable?
>>
>>Thanks heaps,
>>
>>Ben Hitchcock
>
>Regards,
>
>Jim Robertson
>NEWFOUND ELECTRONICS
>________________________________________
>Email: newfound@pipeline.com.au
>http://www.new-elect.com
>MPLAB compatible PIC programmers.
>________________________________________