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???
02/07/07 19:37
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 		 #132240 - a real example
Responding to: ???'s previous message
Out of my (maybe already pathologic) curiosity, I partially disassembled the firmware of an old 8042 keyboard controller I found on a thrown out '286 board (thanks for your excellent disassembler, Jeff!). And guess what - I found a selftest routine there.

However, don't expect anything spectacular. More-less standard RAM stuck-at/short test, checksum over (part of) the code memory, and that's about all. No peripherals tested, and of course it assumes that most of the core and at least part of the code memory (ROM there) is OK.

So I dug out an older file which I got from a '51SL-based keyboard controller from a disintegrated laptop - and found something similar there, too.

Those who reverse engineer various engine ECUs, might perhaps find something similar...?

JW


List of 53 messages in thread
TopicAuthorDate
805x system self-test            01/01/70 00:00      
   erk            01/01/70 00:00      
      Well ... it seems to me ...            01/01/70 00:00      
         Not That            01/01/70 00:00      
            Clearly if the CPU is knackered            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
                  depending on application...            01/01/70 00:00      
                     let me reframe the question ...            01/01/70 00:00      
                        do you want to do the manufacturer's job?            01/01/70 00:00      
                           don't get me wrong            01/01/70 00:00      
                           No, it's not his job ...            01/01/70 00:00      
                  OF COURSE you do            01/01/70 00:00      
                     I don't know which disty's you do biz with ...            01/01/70 00:00      
                        why? what? when? how?            01/01/70 00:00      
                           Where you sit determines what you see.            01/01/70 00:00      
                              not at all            01/01/70 00:00      
                              RC reset            01/01/70 00:00      
                                 on testing            01/01/70 00:00      
                                    re smoke - I just realize            01/01/70 00:00      
                                       5 Volts can produce smoke            01/01/70 00:00      
                                    Why focus on smoke? Have you missed the point?            01/01/70 00:00      
                                 nope ... not that simple            01/01/70 00:00      
                                    but it sounds exactly so...            01/01/70 00:00      
                                       I've tried a MAX1232 ... is that good enough?            01/01/70 00:00      
                                          pushbutton reset            01/01/70 00:00      
                                             pushbutton            01/01/70 00:00      
                                                I don't understand            01/01/70 00:00      
                                                   NO!            01/01/70 00:00      
                                                      some options            01/01/70 00:00      
                                                         That' not exactly the case ...            01/01/70 00:00      
                                                            weird parts            01/01/70 00:00      
                                                               Too bad I didn\'t know about your interest earlier            01/01/70 00:00      
                                                                  your test subjects.... :-)            01/01/70 00:00      
                                                                     under other circumstances ...            01/01/70 00:00      
                           Jan, I think you missed the point            01/01/70 00:00      
                        OH            01/01/70 00:00      
                           Digikey and Mouser aren't "normal" disty's            01/01/70 00:00      
                              You have a very low opinion of distributors, is th            01/01/70 00:00      
                                 Yes I do ...            01/01/70 00:00      
                                    nope            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
   Your test program            01/01/70 00:00      
      waitaminute ... I didn't say I'd written it ...            01/01/70 00:00      
         Well...            01/01/70 00:00      
            never used a '320.            01/01/70 00:00      
               So...            01/01/70 00:00      
                  I\'ve built 805x stuff since the \'70\'s ...            01/01/70 00:00      
            aackk! it double-posted again            01/01/70 00:00      
   a real example            01/01/70 00:00      
      Testing 8051s            01/01/70 00:00      
         I'm just out to find stuff that's "broken"            01/01/70 00:00      
         how did you come to that figure?            01/01/70 00:00      
            Fault coverage figure            01/01/70 00:00      

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