17 May
2005
17 May
'05
4:46 a.m.
Subject: Re: Tandy T100 info
From: John Hogerhuis <jhoger at gmail.com>
Date: Mon, 16 May 2005 17:58:44 -0700
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On 5/16/05, Allison <ajp166 at bellatlantic.net> wrote:
I'd be surprized if it weren't already done. Way too easy. The switch
for M100 is also trivial piece of code. The real trick is to keep
the rom socket available. So the magic is to make the all ram option
a third one and software selectable.
I'll have to look more at all this. However,
step one is to
get the M100 I have up to 32k ram. Then I'll look at how secondary
rom socket space is used. I'd like a configuration that also has
ram at 0000h and maybe a OS in it. I've considered getting
That has been done... I believe what you do is put a RAM in the Option
ROM socket and bring out the necessary signals (/WE I think). Also the
NEC 8201A and NEC 8300 are able to switch to all RAM mode with a short
program. There was at some point in time a device called a PIC
Disk that
allowed you to run CP/M on the Model 100. It connected to the bus
expansion port underneath the M100.
Tandy also had one that added a vidio and disk to the M100 that
used the bus connector. I have part of the manual for it.
Allison