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From: root@meowqat.UUCP
Newsgroups: comp.sys.tandy
Subject: Re: Anyone got a Tandy 1000?
Message-ID: <-497148@meowqat>
Date: Mon, 27-Jul-87 09:19:00 EDT
Article-I.D.: meowqat.-497148
Posted: Mon Jul 27 09:19:00 1987
Date-Received: Fri, 7-Aug-87 06:12:05 EDT
References: <13938@watmath.UUCP>
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Nf-ID: #R:watmath.UUCP:-1393800:meowqat:-497148:000:1819
Nf-From: meowqat.UUCP!root    Jul 27 08:19:00 1987


well, i'm not sure that i count as knowledgable, but i'll give it a try.  

if you open your Tandy 1000 and compare it to your PC, you will see a lot of
difference - LSI's all over the place. for the most part, though, they funtion
identically to the PC's discrete stuff. 

the major differences (read: stuff you may actually notice in operation) are in
the video and RAM areas. 

the Tandy 1000 does not have separate video RAM, but instead uses a portion 
of the system RAM for video. this won't cause trouble with most programs,
since the BIOS will 'translate' IBM video addresses into something the 1000 can
use. occasionally, however, an IBM program that requires N RAM may require N 
plus one more bank on the 1000 (since some of the RAM is used up for video).

also, the Tandy 1000 supports some additional video modes (also found in the
PC jr). this allows some really nice graphics that you can't get on a standard 
PC. one quirk here: the PC jr video modes require the use of interrupt 5 for
vertical sync. on the PC, this was used for hard disk. the 1000 uses interrupt
2 for hard disk instead. 

as for the DOS being bootable only on the 1000, well, IBM never said the PC was
Tandy compatible. Some of the neat extra features the 1000 uses might cause a 
PC to choke.

finally, if you have a newer version of the 1000, (1000EX or 1000SX) you may
also have a selectable clock speed - 4.77 or 7(and change) MHz. on the 1000SX
the interrupts discussed above are switch selectable - you can have a PC
hard disk board, or expanded video modes, but not both.

hope that helps some.

		larri@meowqat
(i'd give a more complete path, but i'm not sure what it is today)

[the opinions expressed above are my own and in no way reflect those of my 
employer. if my employer has opinions, let 'em post them themselves.]