Re: [Freedos-user] FDNPKG v0.99

[Bob Schwier]

On Wed, 9/2/15, Mateusz Viste  wrote:

 Subject: Re: [Freedos-user] FDNPKG v0.99
 To: freedos-user@lists.sourceforge.net
 Date: Wednesday, September 2, 2015, 1:37 AM
 
 On 02/09/2015 04:43, Ralf
 Quint wrote:
 > You are making a totally
 wrong assumptionn that 16bit software means you
 > are limited to 640KB of memory.
 
 Absolutely not - my assumption
 is that running on 8086/80186 means I am 
 limited to 640KB (or let's say < 1M).
 Hence for software with higher 
 memory
 requirements there is little or no advantage of being
 16bit.
 
 Mateusz
 
 
 
--___
 Before it died, I had my last 8086 with 2M of higher memory.
bs
 

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Re: [Freedos-user] FDNPKG v0.99

[Mateusz Viste]

Hi Bob, Dennis,

Good point on these hardware EMS cards, it is indeed a way of providing 
additional memory irrespectively of the CPU model. I never had one of 
these, but I did hear about them. I stand corrected on that one! :)

cheers,
Mateusz



On 02/09/2015 18:12, dmccunney wrote:
> On Wed, Sep 2, 2015 at 1:37 AM, Mateusz Viste  wrote:
>> On 02/09/2015 04:43, Ralf Quint wrote:
>>> You are making a totally wrong assumptionn that 16bit software means you
>>> are limited to 640KB of memory.
>>
>> Absolutely not - my assumption is that running on 8086/80186 means I am
>> limited to 640KB (or let's say < 1M). Hence for software with higher
>> memory requirements there is little or no advantage of being 16bit.
>
> And getting around the 640K limit was the reason for HIMEM,SYS, EMS,
> XMS, and playing games with the A20 address line.  I routinely used
> the capability when I *was* running on an 8086.  My old XT clone had
> an expansion card with a MB of additional RAM, split between a
> ramdisk, disk cache, and EMS memory for apps that could use it.  This
> all started back *before* the 286 and later 386 CPUs became common.
>
> If you wish to restrict yourself to 640K, feel free, but it's a
> choice, not a requirement.
>
>> Mateusz
> __
> Dennis
> https://plus.google.com/u/0/105128793974319004519
>


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Re: [Freedos-user] FDNPKG v0.99

[dmccunney]

On Wed, Sep 2, 2015 at 1:37 AM, Mateusz Viste  wrote:
> On 02/09/2015 04:43, Ralf Quint wrote:
>> You are making a totally wrong assumptionn that 16bit software means you
>> are limited to 640KB of memory.
>
> Absolutely not - my assumption is that running on 8086/80186 means I am
> limited to 640KB (or let's say < 1M). Hence for software with higher
> memory requirements there is little or no advantage of being 16bit.

And getting around the 640K limit was the reason for HIMEM,SYS, EMS,
XMS, and playing games with the A20 address line.  I routinely used
the capability when I *was* running on an 8086.  My old XT clone had
an expansion card with a MB of additional RAM, split between a
ramdisk, disk cache, and EMS memory for apps that could use it.  This
all started back *before* the 286 and later 386 CPUs became common.

If you wish to restrict yourself to 640K, feel free, but it's a
choice, not a requirement.

> Mateusz
__
Dennis
https://plus.google.com/u/0/105128793974319004519

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