On Friday 07 May 2004 04:29 am, Jaap van Ganswijk wrote: > Hi George, > > At 2004-05-06 20:24, George Mogiljansky wrote: > >I found a note from 1995 that this chip was > >once-programmable. > > It depends on the characters behind 'MC68HC05', > the so-called postfix, could you write them down. > Among us we have a lot of Motorola-expertise and > databooks etc. Please also tell us the > production date on the chip, something like > 9534 perhaps? Or give an indication how old > the computer is. Most chips in a printed circuit > board have a code like 9534, the first two > digits are the year (95) and the last two > digits are the week number (34). Just look at > the dates of about five to ten chips and you'll > know what date the printed circuit board was > produced after. (And usually shortly after, > because keeping unused stock costs money). > > Here are more tips about chip 'spotting': > http://www.chipdir.info/spotting.htm > > >Also, Fatcity once hosted a mailing list dedicated to.. > >"..Purpose: Developers, engineers and users of the > >Motorola MC68HC05 family of devices can talk about the > >chip, how to use it, share techniques, code, > >schematics, discuss tools, etc.." > > I just tried to subscribe to it and I got back: > >>>>> subscribe mc68hc05-L > > > >No such mailing list is carried at this site. Use LISTS for assistance. > > The official Motorola 6805/08 has also gone it > seems, because I just tried to subscribe and > couldn't. > > Well, the 6805-
> >So I hope it is flashable; > > I hope for you it's not. ;-) No version of the 6805 had Flash, that would be the 08 family, many years later. I wish they would do a 68HC11 in flash, I find the 11 and the 68000 are the easiest chips to program in assembler, than all of the others I've done. > BTW2. In those days memory like this wasn't flash > yet I think, but EEPROM. It might help to make the > distinction when you are doing more research. If it is not a 68705xxx then it is a ROM part. > > When it's a systematical problem it's probably the > 10-year EEPROM issue. I'd go more with static damage myself. As a shot in the dark cover the 6805 with black electrical tape and try that. They where very light sensitive. Mostly an issue when programming the EPROM based parts. -- � � � � � � � � � � http://www.softwaresafety.net/ � � � �http://www.unusualresearch.com/ http://www.bpaddock.com/ -- Author: Bob Paddock INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
