On Fri, Feb 9, 2018 at 3:41 PM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> The V-series may be a good example of why Intel didn't want to publicize
> the added 8085 instructions.
>
Maybe. What I'd heard from multiple sources was that they only wanted the
8085 to replace the 8080, so
On 02/09/2018 01:59 PM, allison via cctalk wrote:
> I use that as an example of compatibility or extensions another more
> familiar is the NEC V20 fits in the 8088 socket but has enhanced
> performance and native 8080 emulation mode.
The V-series may be a good example of why Intel didn't want to
On 02/09/2018 04:18 PM, Sean Conner wrote:
> It was thus said that the Great allison via cctalk once stated:
>> The industry was loaded with that the 6502 series also had that going on
>> as well as the 6809 and others.
> Do you have any information about undocumented opcodes for the 6809?
>
>
On 02/09/2018 12:26 PM, allison via cctalk wrote:
> IBM PC early also did that... other vendors of the 8088 didn't work
> in the 64K and early 256K IBM PCs due to a slight timing variation
> that reputedly intel helped design in. One gate fixed it but it was
> undocumented thing you could getaway
It was thus said that the Great allison via cctalk once stated:
>
> The industry was loaded with that the 6502 series also had that going on
> as well as the 6809 and others.
Do you have any information about undocumented opcodes for the 6809?
-spc
On 02/09/2018 12:23 PM, Chuck Guzis via cctalk wrote:
> On 02/09/2018 05:22 AM, allison via cctalk wrote:
>
>> Also all of the competitors and second sources that made 8085s had the
>> added instructions. The are indeed handy too.
> Calmos (then later Tundra) Semiconductor actually documents them
On Thu, Feb 8, 2018 at 9:56 PM, Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> On 02/08/2018 07:18 PM, Eric Smith via cctalk wrote:
> > At some point I read an article or a transcript of an interview with an
> > Intel employee (or former employee) who had been involved with the design
>
On 02/09/2018 10:57 AM, Warner Losh via cctalk wrote:
> For those that don't want to read through the entire datasheet,
> https://electronicerror.blogspot.com/2007/08/undocumented-flags-and-instructions.html
> has a good summary.
RIM and SIM were always documented for the 8085. Not doing so wou
On Fri, Feb 9, 2018 at 11:29 AM, Al Kossow via cctalk wrote:
>
>
> On 2/9/18 9:23 AM, Chuck Guzis via cctalk wrote:
>
> > Calmos (then later Tundra) Semiconductor actually documents them in
> > detail in their CA80C85 datasheet, but those were from the early 1980s.
>
>
> the info is still out the
On 2/9/18 9:23 AM, Chuck Guzis via cctalk wrote:
> Calmos (then later Tundra) Semiconductor actually documents them in
> detail in their CA80C85 datasheet, but those were from the early 1980s.
the info is still out there
http://saxelec.com/doc/T8000.pdf
On 02/09/2018 05:22 AM, allison via cctalk wrote:
> Also all of the competitors and second sources that made 8085s had the
> added instructions. The are indeed handy too.
Calmos (then later Tundra) Semiconductor actually documents them in
detail in their CA80C85 datasheet, but those were from th
On 02/08/2018 11:56 PM, Chuck Guzis via cctalk wrote:
> On 02/08/2018 07:18 PM, Eric Smith via cctalk wrote:
>> At some point I read an article or a transcript of an interview with an
>> Intel employee (or former employee) who had been involved with the design
>> of the 8085, describing how he had
On 02/08/2018 07:18 PM, Eric Smith via cctalk wrote:
> At some point I read an article or a transcript of an interview with an
> Intel employee (or former employee) who had been involved with the design
> of the 8085, describing how he had specified additional instructions over
> those of the 8080,
At some point I read an article or a transcript of an interview with an
Intel employee (or former employee) who had been involved with the design
of the 8085, describing how he had specified additional instructions over
those of the 8080, and they had been implemented in the silicon, but then
the d
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