[FlexNet] TNC Compatability with 6pack ROM

Thu, 12 Feb 2004 10:14:34 -0600

Peter:

MFJ added a chip to do memory bank switching in the MFJ-1270C version...

Fix consists of unplugging this chip, and inserting a wire jumper into
socket between two pins...

I will forward exact info tonight from my home email address.  Information
may be posted on www.northeastflexnet.org page, but I'm not certain..

As far as MFJ1270B model, it is absolutely compatable...  Not certain of
what your seeing with pin count on memory chip...  6Pack and  stock EPROM
are both 27256 devices...  Could you be confusing the "State Machine" 2716
EPROM with the "Main Program" 27256 EPROM ? 

If need to talk, you can reach me at home at (631) 427-6511 tonight...
Will be glad to help...

73  John WB2CIK

John C Papson, Principal RF Engineer
Telular Corporation
580 Old Willets Path
Hauppauge, NY, USA 11788
Voice: (631) 232-6070 ex213
Fax: (631) 232 6082
Email: [email protected]

> -----Original Message-----
> From:	Peter Fournia [SMTP:[email protected]]
> Sent:	Thursday, February 12, 2004 10:51 AM
> To:	[email protected]; wnypg
> Cc:	Jon Dickason
> Subject:	[FlexNet] TNC  Compatability with 6pack ROM
> 
> Difficulties with late model MFJ TNCs has occurred during our attempt to 
> start a FlexNet node in Rochester, NY.  Only one of four TNC's worked. 
> I am inquiring about modifications to the MFJ-1278 and MFJ-1278B TNC's 
> that will enable them to be used as a FlexNet node controller.  In all 
> cases the TNC's worked with the stock MFJ ROM.  The problem occurs when 
> the 6pack ROM (V3.3g) is installed.  The problem symptoms were 
> consistent using 2 different computers. We have no problem using the 
> MFJ-1274 TNC.
> 
>      1) MFJ-1278 (serial port problem using the FlexNet ROM, "no device 
> present" indicated when using a terminal program, the PTT light remains
> on)
>      2) MFJ-1270C (serial port problem using FlexNet ROM, the DCD light 
> remained on)
> 
> Also, the MFJ-1278B is not compatible because it has a 16 pin ROM but 
> the 6pack ROM is 14 pins.
> 
> Question:
>     Is there something we can do to the MFJ-1270C or MFJ-1278 to make it 
> work using 6pack?
>     What are the TNC models that are successfully being use by your 
> FlexNet node?
>     Do you have 2 TNC's that we may purchase (Tiny-2)
> 
> Peter Fournia, W2SKY
> 
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