IBM 5150 PC

[Phill Harvey-Smith]

Seth Morabito wrote:
> On Wed, Jul 8, 2009 at 2:14 PM, Phill
> Harvey-Smith<afra at aurigae.demon.co.uk> wrote:
>> Not sure of this but will 64K be enough RAM to work with a hard drive ? I
>> believe Dos 2.x was the first that supported hard drives, dunno what it's
>> minimum RAM requirement is tho.
> 
> I know it boots DOS 2.11, so maybe this is enough.

Though that's with a floppy only system, a hard disk will of course need 
some memory for buffers, house keeping etc.

> I'm keeping an eye out for a memory expansion card as well. 256K
> should be enough for anyone, right? :-)

640K acording to Mr Gates.....

Actually I'm supprised no one has made an XT type card that has a single 
1M SIMM mounted on it to expand the memory to 640K, should be pretty 
easy to do as most simms will self refresh if you reverse the order of 
RAS and CAS once in a while. I know this is at least in theory possible, 
as I have hooked a 1M simm up to a Dragon 32 (UK CoCo clone) in this way.

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.