From: nopes@none.com   
      
   Hi all.   
      
   Just reviving my old thread for reference below.   
      
   I bought a cheap 1541-II of ebay, pulled the ROM out of it and put it in my   
   broken drive and   
   presto, it worked. I must have toasted my old drive in the process of   
   pulling out the 6502, 6522's  and   
   static RAM chip to install sockets, serves me right for not wearing an   
   anti-static wrist strap.   
      
   Now the question is, how do I burn a new rom ?   
      
   I have a LV48 programmer and bought some M27C256 chips but it seems I am not   
   writing   
   the image correctly. Ray Carlsen's page specifies that the ROM reads as a   
   M27C128, however   
   I am not able to find them so I'm using the 256 instead.   
      
   Are there any doc's out there on how to do this ?   
      
   Cheers.   
      
   "Sam"  wrote in message news:...   
   > Hi Guys,   
   >   
   > I am still working on a 1541II drive and have some questions, but first of   
   > all I would like to explain   
   > the symptoms I was having and what I had done & have been doing.   
   >   
   > 1. Symptom   
   >        * When the drive is powered on, the spindle runs continuously and   
   > the LED stayed on.   
   >    Action   
   >        * Replaced 6502 chip   
   >   
   > 2.  Symptom   
   >        * After replacing the 6502 and powering on the drive, the drive led   
   > now flashes slowly every 2 seconds.   
   >     Action   
   >         * Replaced static RAM chip LC-3517A with the same type.   
   >   
   > After performing those 2 actions I am now experiencing Symptom 1 again. I   
   > thought the replaced 6502 may have been damaged again, but I have several   
   > 6502 spares that I tried.   
   >   
   > Now I am beginning to think that I may have damaged the ROM, tt reads fine   
   > in my programmer as a 27128. The problem is that the binary produced does   
   > not match with other 251968-03 I eproms I have downloaded, there are many   
   > side by side differences and CRCs come out different. Were there different   
   > versions of the ROM with 251968-03 ?   
   >   
   > My dumped rom produced CRC32(0xf455d750)   
   > Downloaded ones all produced CRC32(0x899fa3c5)   
   >   
   > I can't find any info on different versions of the 251968-03. So hopefully   
   > the rom is stuffed and I can just burn a new one, your thoughts ?   
   >   
   > Cheers,   
   > Sam   
   >   
      
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