From:wa2ise@cbnewsb.cb.att.com (robert.f.casey) Newsgroups:rec.radio.amateur.misc Subject:ICxx71 ram adaptor for use with eprom programmer Keywords:mod Message-ID:<1991Nov3.211340.28400@cbfsb.att.com> Date:3 Nov 91 21:13:40 GMT Sender:news@cbfsb.att.com 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@WW (NONE) Sb:IC-xx71-ram-adapter (1. update) de DG8FZ @ DB0SIF 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 @ db0aaa, Q0 11 -------.7 D0 AD 3 12.------ 7 A 3 df8wu @ db0lj , Prog 27 -------.8 WR' AD 2 11.------ 8 A 2 dc4fe & testet with: . AD 1 10.------ 9 A 1 dl8zaw @ db0sif 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 @ db0sao.deu.eu) 12.Dez.89, 21.Okt.91 =========================================================================== Note:I haven't tried or verified this, proceed at your own risk. Please direct questions to DG8FZ@db0sao.deu.eu on packet. WA2ISE  Amsterdam View Our Stats   CLICK FOR A FREE DOMAIN NAMES HTTP://WWW.YOURNAME.TK FOR YOUR OWN WEBSITE IF YOU CLICK HERE AND YOU CAN VOTE FOR OUR FREE WEBSITES IN THE TOP 100 LIST  WANT A TOP RANKING ? USE THE ULTIMATE SOFTWARE SUITE FOR WEB SITE PROMOTION  FreeWebSubmissions Submit Your Site To The Web's Top 50 Search Engines For Free THE ALEXA BANNER, THIS BANNER GIVES THE DALLY STATISTICS OF THIS FREE WEB SITE The World of Free Packet Radio Software Amsterdam The World Of Free Packet Radio Software Amsterdam The Netherlands |