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View Full Version : Need wiiring for serial jtag

hughnohoo
07-11-2008, 03:20 AM
new pc, no parallel port, no serial port.

Going with usb to serial adapter for emu, and hopefully for jtag too, but need wiring pinouts for jtag as serial.

Thanks.
phreakydave
07-11-2008, 03:23 AM
As far as I've ever known, there is no serial jtag for these receivers.
Wiley-X
07-11-2008, 03:25 AM
The program (JKEYS) is hardcoded for parallel port only.
hughnohoo
07-11-2008, 04:22 AM
so why does the prefences tab give you the option of paralle or "interface" on COM1 ?

wtf is an interface ?
orra
07-11-2008, 05:18 AM
its a jinterface or ijtag or intelligent jtag...n1 days but I heard they worked very well
Pete391
07-11-2008, 05:19 AM
All I know is that I have two newer computers...Less than 2 years old and both have parallel ports but neither will work with my jtag...I have 4 or five older computers 500mhz or less and they all work fine with my jtag..Dont know why the older computers work fine and the newer ones wont..
orra
07-11-2008, 05:31 AM
didn't dell's always have a prob with the parallel port? not enough volts or current maybe
phreakydave
07-11-2008, 05:44 AM
All I know is that I have two newer computers...Less than 2 years old and both have parallel ports but neither will work with my jtag...I have 4 or five older computers 500mhz or less and they all work fine with my jtag..Dont know why the older computers work fine and the newer ones wont..

Changed your settings for the parallel port in the bios to EPP, ECP, etc.? That seemed to help one computer I had that problem with a while back.
Wiley-X
07-11-2008, 03:30 PM
It's all about the settings baby... Yes, Dell's (and some E-machines) have problems with JTAG/JKEYS due to power problems.

All of my computers are "new" and yes, I had to go into device settings and "tweak" them all to get them to run both JKEYS and the PCI Serial card I bought to work my ISO.
.
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rg6a
07-11-2008, 04:23 PM
Once again Wiley was spot on, check the settings on the old boxes and just tweak.

Also your new unit has USB 2.0 specs, the old ones may be USB 1.0, which is Slower keep that in mind.

Oh, an 'interface' is a port on your computer (parallel, serial, usb,etc.) that allows it to Communicate with an External Device.
Wiley-X
07-11-2008, 07:15 PM
I think he was referring to a "Jinterface" which was a cable that the author of JKEYS either developed himself or supported. It was a parallel interface as well. I don't think you can get them anymore, but it was very much like a buffered JTAG.
hughnohoo
07-11-2008, 08:36 PM
Yeah, I found the link for jinterface cable, but site is gone now.
So, which is best remaining option:
1. use a usb to serial adapter, usb2.0 compliant, which also has a parallel adapter (db25), but dont know if there is sw to support that, or
2. try and jury rig either a usb or serial adapter and hope for the best LOL ?
Also taking other options :)
greypower
07-11-2008, 08:46 PM
Just posted a schematic for the jinterface device. here is the link:

http://bellexpress.vu/forum/local_links.php?catid=65

Hope this helps.
hughnohoo
07-11-2008, 09:10 PM
thx ! Hope to be able to d/l early tomorrow am since I am not one of the chosen. :)
greypower
07-11-2008, 10:09 PM
Another option - if you have an open slot in your PC - is to get a PCI card parallel port adapter. Might be the easiest way to go.
hughnohoo
07-12-2008, 03:57 PM
Just posted a schematic for the jinterface device. here is the link:

http://bellexpress.vu/forum/local_links.php?catid=65

Hope this helps.

SWEET ! Looks the the mb from my pc .....
thanks !
dss_ironman
07-13-2008, 08:46 PM
A buffered JTAG has always been recommended as the best most technically correct solution to communicate with devices that use this Industry standard interface.
It provides the power necessary for achieve correct voltage levels on the JTAG interface.
The simple JTAG mostly works, but is not very good for many later IRDs.
I have never used the Jinterface but am convinced that it also provides the correct levels for proper communications with the JTAG interface.
As far as newer computers not having "REAL" parallel ports or any at all, why not just use a doorstop of a computer with a "REAL" parallel port for these tasks.
Not much of an investment, even an old laptop would be fine.
FYI, I have had no problems using a nearly brand new desktop Dual Core Athlon 64 with a "REAL" Parallel port and a buffered JTAG to communicate with JTAG devices.