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From: rstevew@armory.com (Richard Steven Walz)
Subject: Re: help with 8085
Organization: The Armory
Date: Thu, 29 Dec 1994 14:28:35 GMT
Message-ID: <D1KtJo.7Ev@armory.com>
References: <kas219.36.2EFB9822@psu.edu> <JG67A0K.mgc2@delphi.com>
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In article <JG67A0K.mgc2@delphi.com>,
Marc Christensen  <mgc2@delphi.com> wrote:
>keith soldavin <kas219@psu.edu> writes:
> 
>>I have been trying to develop a simple robot that will simply navigate my 
>>house and not break anything but I have benn having several problems.  First, 
>>I am having problems developing a simple ultrasonic raging system but I 
>>haven't had any luck.  Does anyone know of a simple system with a range betwen 
>>6" to about 20'?  I also need to know how it is possible to connect an Intel 
>>8085 microcontroler to an EPROM memory chip.  I have tried following the 
>>limited diagrams in the Intel manual but I haven't had any luck.  My main 
>>problem with the interface is how to latch the address for the memory chip.  
>>If someone could send me a specific wiring diagram or the location to find one 
> 
> 
> 
>>I would be grateful.  Write to me at KAS219@psu.edu or just respond on this 
>>system.  Thanks in advance!
>>
>>
>>    Keith Soldavin
>>    KAS219@psu.edu
> 
>I looked at the 8085 once and decided against it because I could get
>8051 parts cheaper that were more integrated. if you are set
>on the 8085 anyway you may want to call all-electronics , I don't have
>a number for them but someone else may be able to help with that.
>they have/had a telephone device of some sort that was run by an 8085.
>this is from memory so it may be a little off but...
>it was a white case built to mount on the wall and was about 4"x5" square.
>it had an 8085 cpu
>an 8050? chip that has a timer and ram and the latches to the memory lines.
>2K? bytes static ram chip.
>eprom socket, empty.
>power supply to take AC in from a wall wart, wart removed.
>touch tone decoder
>about 5 relays one that was about 4 double throw contacts.
>everything was built on the board and should probly work with an eprom added.
>it may be worth your time to reverse engineer the board enough to find out
>how to run the relays and decoder chip.
>They cost about $3.50 if I recall.
>there is a header on the board that goes to all the pins on the CPU that
>should allow you to add anything you may need that it not on the board.
>BTW. the ram on the board also seems to be battery backed with an included
>9V battery.
> 
>Marc Christensen
-------------------------------
Marc, I really don't know why you're steering him right into the same
problem he seems to be having: BOTH the 8085A and the 8051 have a time-
multiplexed address bus using an ALE line!!! THAT's what he's ASKING about!
One typically uses the 74LS373 (8051) and the other the 74LS374 (8085A),
(note: the 8085 was buggy, so they don't really exist now, but we still
just call all of them 8085's). I agree that the 8051 is a microcontroller,
and better for that for some things, but if the guy knows the hell out of
8085 code, then why screw him up having him learn an very different
instruction set all of a sudden!!!?? The interface problem is virtually
identical for extended I/O!!!
-Steve Walz  rstevew@armory.com

