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Article #11

TI 99/4A homebrew expansion RAM problem

#11
From: Kchula-Rrit
Date: Fri, 06 Jul 1984 01:41
36 lines
1802 bytes



     I'm glad to see that this newsgroup has been formed.  A few days ago, I
was informed that net.zx was going to be used unofficially for net.ti99.  This
is a message that I put in net.zx, but just found out about net.ti, so am 
placing it here, instead.
 
     For starters, I just built a 32K expansion RAM for my TI 99/4A and found
that it seems to play merry havoc with TV reception.  Otherwise, the RAM works
just fine.  Wrapping the box in aluminum foil seemed to not help at all.
Any {hopefully inexpensive/free} ideas to help me cure this?

     The memory map is thus:

       0000 -> 1FFF     Console ROM
       2000 -> 3FFF     Expansion RAM low bank
       4000 -> 5FFF     Peripheral Driver programs
       6000 -> 7FFF     Cartridge space
       8000 -> 83FF     Console RAM
       8400 -> 9FFF     Speech Synthesizer,Video Display Processor
       A000 -> FFFF     Expansion RAM high bank

     What does BASIC put in low Expansion RAM?  If it is available to me, then
I should see "13298 STACK
	      32XXX PROGRAM BYTES FREE" instead of "24XXX PROGRAM".  I am very
curious about this.

     For the purposes of discussion, it may be advisable to send answers to
net.micro.ti.

				Thanx,

				Kchula-Rrit
				!menlo70!nsc!nessus
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Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!mgnetp!ihnp4!nsc!nessus

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1.chuqui 4/7/84; site nsc.UUCP
Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!mgnetp!ihnp4!nsc!nessus
From: nessus@nsc.UUCP (Kchula-Rrit)
Newsgroups: net.micro.ti
Subject: TI 99/4A homebrew expansion RAM problem
Message-ID: <1148@nsc.UUCP>
Date: Thu, 5-Jul-84 21:41:10 EDT
Article-I.D.: nsc.1148
Posted: Thu Jul  5 21:41:10 1984
Date-Received: Sat, 7-Jul-84 01:23:03 EDT
Organization: National Semiconductor, Sunnyvale
Lines: 39