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Vlasta
Joined: 15 May 2012
Posts: 2565
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 Posted: Tue Aug 05, 2014 11:37 pm Post subject: Latest Weird Wafer from Motorola - a 4" Beauty |
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Going through my wafer boxes before I move back to Hong Kong - came across two weird looking wafers and decided to take a closer look. The wafers are in pretty bad shape and have not been handled well but are interesting - marked as "Motorola CISC" they have dies on them from two different micro-controllers - the 68HC705 and the 68HC711. The '705 is marked as "test chip". The Copyright date is 1993. Anyone got any idea of why they would have two different dies on one wafer? Could it be a test piece?
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Robev
Joined: 10 Mar 2006
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Location: New Zealand
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| Posted: Tue Aug 05, 2014 11:53 pm Post subject: |
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Back to Hong Kong?
The Aussies too much for you  
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Vlasta
Joined: 15 May 2012
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| Posted: Tue Aug 05, 2014 11:56 pm Post subject: |
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| Robev wrote: | Back to Hong Kong?
The Aussies too much for you |
Yeah I am moving back as I missed the place too much AND the near 50% tax in Australia meant I was effectively working half the week for the government - a government by the way that as an immigrant I get NOTHING from - no Medicare, no education - nothing and I am not even allowed to vote for...
Work that out - I pay 50% of my salary over to them and still have to pay for schools, doctors and dentists......
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Robev
Joined: 10 Mar 2006
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Location: New Zealand
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| Posted: Wed Aug 06, 2014 12:38 am Post subject: |
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Ah well you gotta be earning at least a couple of hundred K a year to be paying that much in tax. Well above average in any case 
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Vlasta
Joined: 15 May 2012
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| Posted: Wed Aug 06, 2014 12:42 am Post subject: |
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yeah for sure above average top line but after tax it feels like I was robbed in broad daylight.
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Vlasta
Joined: 15 May 2012
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| Posted: Wed Aug 06, 2014 12:42 am Post subject: |
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| Robev wrote: | | Ah well you gotta be earning at least a couple of hundred K a year to be paying that much in tax. Well above average in any case |
Anyway - tell me about the wafer - weird one or not?
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Vlasta
Joined: 15 May 2012
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| Posted: Wed Aug 06, 2014 12:47 am Post subject: |
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And I just noticed there are two versions of the '711 device - one with memory/cache and one without - weirder still!!
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Robev
Joined: 10 Mar 2006
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| Posted: Wed Aug 06, 2014 1:52 am Post subject: |
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Have to be a test wafer
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kaijusears
Joined: 19 Dec 2012
Posts: 127
Location: Huntsville Al. USA
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| Posted: Thu Aug 21, 2014 9:38 am Post subject: |
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| The added 7 to 68hc11 or 68hc05 indicated that the chip had UV erasable memory added (EEPROM). We used these chips for development back in the early 90s. You can still pickup these quartz windowed beauties for a few bucks on ebay occasionally. |
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