Re: Early 8051 variants with dual dptr (AMD?)

From	Philipp Klaus Krause <pkk@spth.de>
Newsgroups	comp.arch.embedded
Subject	Re: Early 8051 variants with dual dptr (AMD?)
Date	2016-06-30 09:28 +0200
Organization	solani.org
Message-ID	<nl2hle$6lb$1@solani.org> (permalink)
References	<nkvuhd$7tf$1@solani.org> <nl03qh$s7i$1@solani.org> <n029nb5r45t3n80p6hjahjdkhivh4k8itf@4ax.com>

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On 30.06.2016 04:52, Martin Riddle wrote:
> On Wed, 29 Jun 2016 11:19:31 +0200, Philipp Klaus Krause <pkk@spth.de>
> wrote:
> 
>> On 29.06.2016 09:49, Philipp Klaus Krause wrote:
>>> Which were the first 8051 derivatives with multiple dptr? AFAIK the
>>> Siemens 80C517 was the first with 8 dptr. I've read that AMD had an
>>> early dual dptr vairant, but couldn't find a datasheet yet.
>>> Which device was the first to use the following scheme:
>>> DPL1 at 0x84, DPH1 at 0x85, DPS at 0x86.0?
>>>
>>> Philipp
>>>
>>
>> I found the AMD 80C521, which looks like a good candiate for the first
>> dual-dptr 8051-variant. But I'm not sure if there might be earlier ones.
>>
>> Philipp
> I vaguely remember a Dallas Part with dual data pointers. Not sure if
> it was among the first tho. Maybe 1996 or so.
> keil has a list and data sheets on  their site.
> 
> Cheers
> 

The oldest multi-dptr datasheets I found so far are an 1994 one for the
Siemens 80C517 and an 1987 one for the AMD 80C521.

Philipp

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Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-29 09:49 +0200
  Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-29 11:19 +0200
    Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-29 22:52 -0400
      Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-29 23:28 -0400
        Re: Early 8051 variants with dual dptr (AMD?) rickman <gnuarm@gmail.com> - 2016-06-30 00:15 -0400
          Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-30 09:37 +0200
          Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-30 08:26 -0400
          Re: Early 8051 variants with dual dptr (AMD?) Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2016-06-30 22:52 +0200
            Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-07-01 08:06 +0200
        Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-07-07 01:19 +0200
      Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-30 09:28 +0200

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