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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/42898/re-connection-of-8031-27c512-and-82c55</link><description> 
Hi, 

 
In one of my project i connected 8031, 27c256 and 8255.Here the
A15 line is given common to Chip enable of EPROM and also connected
to G1-pin of address decoder via a NAND gate. 

 
So if the A15 is low eprom is selcted and if high 82c55 is</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/141653?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 08:49:25 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:f53d9bc2-152d-40ce-a8c7-9f2366c85723</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;my mail id is: shankar@triotech.com.sg&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
The whole purpose of a forum is that everybody learns, e-mail
correspondances are worthless for the community as a whole.&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/138268?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 08:48:09 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:654c2f11-5558-4bb9-bf3d-d350310d65e4</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;I am in need of how to access the 8031 with 27C512 (64KB
EPROM)&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
&lt;i&gt;The main problem is the chip select.&lt;/i&gt;&lt;br /&gt;
Irrelevant&lt;/p&gt;

&lt;p&gt;
&lt;i&gt;I am in need of how to access the 8031 with 6264(8KB RAM), and
82c55.&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
&lt;i&gt;The main problem is the chip select.&lt;/i&gt;&lt;br /&gt;
No, &amp;quot;The main problem is&amp;quot; you using the antique 8255, but if you
persist wit5h this stupidity, use A15&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/134814?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 08:15:26 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:8357a5d4-7bd7-4a7f-89ce-00d714494858</guid><dc:creator>Gowri Shankar</dc:creator><description>&lt;p&gt;&lt;p&gt;
I am in need of how to access the 8031 with 27C512 (64KB EPROM),
6264(8KB RAM), and 82c55.&lt;/p&gt;

&lt;p&gt;
The main problem is the chip select.&lt;/p&gt;

&lt;p&gt;
my mail id is: shankar@triotech.com.sg&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/134810?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 08:04:53 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:b1ca2023-5374-48f6-9a57-3121e5d4584c</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;8031, 27c256 and 8255.Here the&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
There are electronics stores around, why did you buy components in
an antique store?&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/123404?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 08:03:45 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:85b8294c-12dd-4603-b6d8-e5d42c5d5862</guid><dc:creator>erik  malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
if possiblecan &lt;i&gt;micro&lt;/i&gt; give &lt;i&gt;microresistor&lt;/i&gt; mail id so
that i can send the circuit and tell me how to solve?&lt;/p&gt;

&lt;p&gt;
I decoded the abbreviations and it still makes no sense&lt;/p&gt;

&lt;p&gt;
Erik&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/112323?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:43:55 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:0a4a9400-e4f4-4e8a-89d4-49b34ef9ba3d</guid><dc:creator>Gowri Shankar</dc:creator><description>&lt;p&gt;&lt;p&gt;
if possiblecan u give ur mail id so that i can send the circuit
and tell me how to solve?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/98425?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:43:15 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:b842a0d7-6653-4856-a419-b80c518e9e3f</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;&amp;quot;previously i used the A15 to select the EPROM and the 8255
using my program. Now the A15 is used and i cannot access
8255&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
Did you read the &lt;b&gt;Hint&lt;/b&gt; from Thomas Zepf?&lt;/p&gt;

&lt;p&gt;
Do you have anything else mapped into XDATA space?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/98430?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:40:37 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:99fd7333-81bc-412a-98f9-504e2d258b19</guid><dc:creator>Andy Neil</dc:creator><description>&lt;p&gt;&lt;p&gt;
You can&amp;#39;t attach files on this forum.&lt;/p&gt;

&lt;p&gt;
You will have to post it somewhere accessible, and give a link to
it&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/74360?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:21:02 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:c69c1df1-b6b7-4d24-adb6-df83408cb277</guid><dc:creator>Gowri Shankar</dc:creator><description>&lt;p&gt;&lt;p&gt;
If want i can send the circuit but how attach the pdf file to this
forum?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/74361?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:17:35 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:44f84100-dc18-4b91-bf73-45e02dd9043e</guid><dc:creator>Gowri Shankar</dc:creator><description>&lt;p&gt;&lt;p&gt;
Now the problem comes in the selection of chip.&lt;/p&gt;

&lt;p&gt;
Bcos previously i used the A15 to select the EPROM and the 8255
using my program.&lt;/p&gt;

&lt;p&gt;
Now the A15 is used and i cannot access 8255.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Re: Connection of 8031 , 27c512 and 82c55</title><link>https://community.arm.com/thread/46803?ContentTypeID=1</link><pubDate>Thu, 14 Sep 2006 03:01:04 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:b8d75222-de4f-4ada-a0b7-fc8cd166693b</guid><dc:creator>Thomas Zepf</dc:creator><description>&lt;p&gt;&lt;p&gt;
exactly the same way as before because normally the eprom lives in
code space and the pio in XDATA space.&lt;br /&gt;
HINT: the EPROM should be accessed via PSEN the PIO via /RD and
/WR.&lt;/p&gt;

&lt;p&gt;
BTW: all of your devices are obsolete.&lt;/p&gt;

&lt;p&gt;
Thomas&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>