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From: nessus@nsc.UUCP
Newsgroups: net.micro
Subject: TI99/4A Assistance
Message-ID: <443@nsc.uucp>
Date: Tue, 11-Oct-83 14:19:19 EDT
Article-I.D.: nsc.443
Posted: Tue Oct 11 14:19:19 1983
Date-Received: Thu, 13-Oct-83 10:59:22 EDT
Organization: National Semiconductor, Sunnyvale
Lines: 25


     Does anyone out there know how the TI99/4A organizes its VDP RAM?  When I
run a rather large program, the first time I try to access the screen using a
user-defined display character the computer gives me a "MEMORY FULL" error
message.  The sequence of operations is this:

	...	...
	1000	CALL CHAR(112"[character definition code]")
	...	...
	2000	CALL HCHAR(10,8,112)
	[at this point the computer goes back to monitor/interpreter(?) and
	says:
	MEMORY FULL AT 2000

     I would like to know what causes this to happen.  The program is smaller
than it was before, yet the computer says "MEMORY FULL".  

     Also, I need some info on how the 9918A Video chip operates.  If anyone can
mail me info on how to access the chip, how to use it, and so on, it would be
appreciated.

					Kchula-Rrit

				menlo70!nsc!nessus