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Path: utzoo!linus!decvax!harpo!eagle!pyuxnn!sda
From: sda@pyuxnn.UUCP
Newsgroups: net.micro
Subject: TRS-80_Maskable_interrupts
Message-ID: <113@pyuxnn.UUCP>
Date: Mon, 15-Aug-83 13:46:01 EDT
Article-I.D.: pyuxnn.113
Posted: Mon Aug 15 13:46:01 1983
Date-Received: Mon, 15-Aug-83 16:58:21 EDT
Organization: Bell Labs, Piscataway
Lines: 10

My news is more a question than a news item. I have been working with
a TRS-80 Model III micro trying to mask out certain interrupts thru the
hardware. According to documentation available, a reset bit in port E0
will deselect a certain interrupt. I have chosen to inhibit the 
RS-232 xmit buffer empty interrupt. The program I am writing will keep
track of all system interrupts and still sees this type of interrput 
with it deselected. This is supposed to be turned off by clearing bit
4 in port E0. Clearly it is not.  Any information on this type of
problem ??