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From: marty1@houem.UUCP (M.BRILLIANT)
Newsgroups: net.micro.trs-80
Subject: Re: Again: What makes the Model 4 work?
Message-ID: <417@houem.UUCP>
Date: Thu, 21-Nov-85 10:31:59 EST
Article-I.D.: houem.417
Posted: Thu Nov 21 10:31:59 1985
Date-Received: Sat, 23-Nov-85 01:59:50 EST
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 34

Thank you, Uh Clem (Frank Durda), and you too, SOB (Stan Barber), for
the Model 4 port info.  Checking it out in BASIC was fun; implementing
it in ASM will be boring but useful.  I got everything but sound.

"OUT 132,4" puts up an 80x24 screen (at reduced brightness), with
garbage in the bottom half and the lines out of alignment.  "OUT
132,132" writes on the bottom half (but the last line is out of range
of the screen).  All I need (after installing an RS-232 interface) is a
few obvious but messy fixes in my terminal program.

"OUT 132,8" gets back to 64x16 with reverse video capability. After
"PRINT CHR$(21)" or a POKE to 16420 (to turn off space compression),
setting bit 7 gives ASCII characters in reverse video.  Now the same
characters that control underline mode on the printer (DMP-100) can be
used for "standout mode" on the terminal.  And a reverse-video cursor
might be better than that blinkin' blinking cursor.

Predictably, changing bit 0 or 1 in an OUT to 132 disables the machine
until RESET is pushed, since the ROM goes away.

Is there a noise-maker in the Model 4?  I tried "OUT 144,everything"
following Stan's suggestion that "90H allows you to sound the sound
board" but got no sound.  Am I missing something?  I'd like to have
an audible bell instead of the visible flash I now have.

None of this is in the Model III/4 Cassette (whatever-title) Operation
and BASIC Manual.  The POKE and OUT for double-speed are in there, but
RAM locations and ports are not mentioned for things you control by
sending characters to the screen.

		M. B. Brilliant		houem!marty1
		39 McCampbell Road
		Holmdel, NJ 07733	(201)-946-8147
		AT&T-BL Holmdel, NJ	(201)-949-1858