Re: BootProg released

From	"Kerr Mudd-John" <admin@127.0.0.1>
Newsgroups	alt.os.development
Subject	Re: BootProg released
Date	2015-07-06 10:52 +0100
Organization	dis
Message-ID	<op.x1ci1fsamsr2db@dell3100.workgroup> (permalink)
References	(1 earlier) <mm91hr$4lg$1@dont-email.me> <ca5622b0-3742-49d5-a136-a6af5b808d9c@googlegroups.com> <mn0don$1ac$1@dont-email.me> <op.x1bbg12dmsr2db@dell3100.workgroup> <mnc4sr$jam$1@dont-email.me>

Show all headers | View raw

On Sun, 05 Jul 2015 21:44:31 +0100, James Harris  
<james.harris.1@gmail.com> wrote:

> "Kerr Mudd-John" <admin@127.0.0.1> wrote in message  
> news:op.x1bbg12dmsr2db@dell3100.workgroup...
>> On Wed, 01 Jul 2015 11:02:17 +0100, James Harris  
>> <james.harris.1@gmail.com> wrote:
>
> ...
>
>>> Things I would like to add if I can make space:
>
> ...
>
>>> * Move code so that the loaded file can start at 0x7c00.
>>>
>> I still don't get why this has to be; just because MS coded it that way.
>
> MS didn't write the BIOS.
>
> I found the following. It explains in some detail why 0x7c00 was chosen.  
> I don't know whether it is correct or not but it sounds valid and makes  
> an interesting read: basically that the lowest practical amount of RAM  
> that the original IBM PC could run IBM DOS 1.0 on was 32k so they chose  
> the 31k point (i.e. 0x7c00).
>
>   http://www.glamenv-septzen.net/en/view/6
>
> That ties in with Wikipedia. Apparently the earliest IBM PC has memory  
> options of between 16k and 256k.
>
>   https://en.wikipedia.org/wiki/IBM_Personal_Computer
>
> James
>

OK. But we don't need to be so constrained nowadays (says he still coding  
for 8086)


-- 
Bah, and indeed, Humbug

Thread

BootProg released "Alexei A. Frounze" <alexfrunews@gmail.com> - 2015-06-21 22:52 -0700
  Re: BootProg released "James Harris" <james.harris.1@gmail.com> - 2015-06-22 14:12 +0100
    The BIOS Drive ID urban legend "Mike Gonta" <mikegonta@gmail.com> - 2015-06-24 17:49 -0400
      Re: The BIOS Drive ID urban legend (was: BootProg released) "James Harris" <james.harris.1@gmail.com> - 2015-07-01 10:44 +0100
    Re: BootProg released "Alexei A. Frounze" <alexfrunews@gmail.com> - 2015-06-25 21:08 -0700
      Re: BootProg released "James Harris" <james.harris.1@gmail.com> - 2015-07-01 11:02 +0100
        Re: BootProg released "Alexei A. Frounze" <alexfrunews@gmail.com> - 2015-07-04 05:18 -0700
        Re: BootProg released "Kerr Mudd-John" <admin@127.0.0.1> - 2015-07-05 19:11 +0100
          Re: BootProg released "Kerr Mudd-John" <admin@127.0.0.1> - 2015-07-06 10:52 +0100
            Re: BootProg released "James Harris" <james.harris.1@gmail.com> - 2015-07-06 21:42 +0100

csiph-web