Re: Differences between 8501R1 and 8501R4

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sun, 15 Dec 2019 21:32:33 +0100 Message-ID: <5763dd30-d809-472a-f03a-3d37c800c9cd_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/15/19 9:16 PM, Frank Wolf wrote:
> 
> On 15.12.2019 21:12, silverdr_at_wfmh.org.pl wrote:
>>
>> I was not referring to port bits but to "side-by-side comparison of 
>> the  8500<->6510 [which shows that] they are 100% identical", which 
>> didn't refer to port bits either. IOW - this is a question if "100% 
>> identical [apart from the outer perimeter were the buffers/drivers 
>> reside]" refers only to port bits or to the whole chip.
> 
> The whole chip is identical. No changes in the logic of the circuit. The 
> crash mentioned (RDY line) comes
> 
> should be caused by the small differences in speed/timing and the way 
> how RDY is implemented.

Also, HMOS-II is faster than NMOS. That alone could explain the crash.

  Gerrit