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 |
