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From: wa2ise
Newsgroups: rec.radio.amateur.misc

Subject: ICxx71 ram adaptor for use with eprom programmer

Keywords:mod

Message-ID: <1991Nov3.211340.28400
Date: 3 Nov 91 21:13:40 GMT

Sender: news
Organization: AT&T Bell Laboratories

Lines:41





copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

63934 BN   2638   0 24-Oct 0027 DG8FZ  91A211DG8FZ  ICOM
 Sb:IC-xx71-ram-adapter (1. update)



de DG8FZ


how to read/programm the ICOM-battery-RAM by EPROMER:



      Adapter ICOM-RAM <==> 2764-Programmer socket

12.dez.89      ....................

               .       R    5V  20.------ 28  +5V the factory programs

Q4-7 16-19 -+  .       A  CS    19.---(*)         the lower 255 Nibbels...

 0V  14 ----+-- 1 E    M  AD 9  18.------ 24  A 9

               .2         AD 8  17.------ 25  A 8 you find the frequency-

+5V  28 --o..o- 3 WP   U  AD 7  16.------  3  A 7 range reading the 'hexdump'

 Q3  15 -------.4 D3   N  AD 6  15.------  4  A 6 backwards.

 Q2  13 -------.5 D2   I  AD 5  14.------  5  A 5

 Q1  12 -------.6 D1   T  AD 4  13.------  6  A 4 my tnx to dl8scu
 Q0  11 -------.7 D0      AD 3  12.------  7  A 3           df8wu  
Prog 27 -------.8 WR'     AD 2  11.------  8  A 2           dc4fe          &

testet with:  .          AD 1  10.------  9  A 1           dl8zaw
IC-751 , 271h, . upside   AD 0   9.------ 10  A 0

   471e,1271a. ....................



 CE--20-inv.--

 OE--22-      nand--(*)    use a 4011 for the nand's and the inverter.

        nand--             dont forget to set the unused 4011 inputs high.

 PGM-27-



if your eprommer cancels operation with a 'no eprom inside'-error

contact each eprommer-pin to a normal 2764 but

dont connect the pins  11,12,13,15,27 of the normal eprom,

dont connect the pins  16-19 to 0V as shown above,

program the 2764 to all bytes = low before.



73's de Karl  (dg8fz
===========================================================================

Note:I haven't tried or verified this, proceed at your own risk.  Please

direct questions to DG8FZ




SOURCE: The QRZ Windows Ham Radio CDROM



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