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From: chris@zorin.UUCP (Christopher Nielsen)
Newsgroups: comp.lang.c,comp.sys.tandy,comp.software-eng,comp.sources.wanted
Subject: Universal Assembler?
Keywords: grammer, asy, opcodes
Message-ID: <195@zorin.UUCP>
Date: 6 Oct 89 07:54:19 GMT
Distribution: na
Organization: Zorin Data Systems, Inc., Santa Monica, CA
Lines: 50

Looking for a simple Lex/Yacc assembler I can adapt to 8085/8080 code.


Hello...

Well, I'm playing with my home brew car alarm again... This a TRS-80 
model 100, I've interfaced to shock sensor, siren, and dashboard LED display.
(more background below...)

Now I have a software request... I'm looking for some sort of simple 
assembler that I can use to develop software on the unix system, and then
load it into the model 100. It uses an 8085 (8080 op-code compatible).
I just need something simple I can adapt. I'm thinking of writing it in C,
But I thought one of you Lex/Yacc hacks out there may have something even
more appropriate. It doesn't have to be 8080 asembler, I guess I can adapt
any op-code set..

Radio Shack does sell an assembler for the model 100, for under $30. However, 
I am certainly not in the mood to mess with a cassette recorder to load it!
Plus, since the machine is now part of the Cherokee, It's not exactly
convienient to do software development on it...

The reason I want to start getting into assembler for 8080 is that I want
to make a digital dash board... in the form of the model 100's screen
(8 lines x 40 chars) positioned over existing dash guages (leaving them 
functioning, and undisturbed). Basic is too slow. I'm using Basic for the 
current alarm program. I want to put a opto-interrupter on the speedometer
cable, and have one of the counters count pulses, and figure out the speed.
Also, voltage to frequence converter, to convert voltages going to oil,
batt, pressure indicators, and count pulses there with the same circuits.

Sound like fun? If I were only brave enough to pull the LCD display apart,
and pull off that silver backing, and replace it with an EL panel...
It looks like the silver reflector is glued to the back. Don't know.
Radio Shack repair center guy said it's real tricky to align the LCD
element with the elsometric connectors, and I don't want to chance it...
A replacement LCD display (incl. driver board) is $200. I'll use a row of 
small incandescent lamps, or perhaps edge-light the LCD. need to experiment...

Comments? Please Email, as I don't read all the groups I'm posting to...


Christopher A. Nielsen
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           ////      P.O. Box 5669 Santa Monica, CA 90405-0669  
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