[N8VEM: 19896] Troubleshooting UNA boot rom on Mark IV

Discussion:

Kip Koon

2015-07-25 11:53:18 UTC

Hi Guys,

I'm programed the UNA boot rom into the 512KB flash chip, but when I power
up the board, I get only 4 flashes of the yellow led. I'm told there should
be 10. Before this, I had ran the test rom image and all tests passed until
it got to the serial tests. The board displayed the ASCII $7F character
over and over. I never saw any regular ASCII text. Any ideas? Thanks in
advance.

Kip Koon

<mailto:***@sc.rr.com> ***@sc.rr.com

<http://www.cocopedia.com/wiki/index.php/Kip_Koon>
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John Coffman

2015-07-25 12:48:18 UTC

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Are you booting at 9600 bps to start?  Are you waiting long enough
while UNA determines the crystal frequency?  10 seconds, minimum. 
This happens only on the first cold boot, or a cold startup
requested from Setup. 
 
You should get the test ROM working first.  However, the baud rate
will depend on your crystal.  See the instructions. 
 
If the test ROM does not pass all tests, then UNA is unlikely to
come up. 
 
--John 
 
 
 
 
On 07/25/2015 04:53 AM, Kip Koon wrote:
<blockquote cite="mid:000601d0c6d0$7fffc470$7fff4d50$@sc.rr.com"
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Hi Guys,<o:p></o:p>
I’m programed the UNA boot rom into the
512KB flash chip, but when I power up the board, I get only 4
flashes of the yellow led.  I’m told there should be 10. 
Before this, I had ran the test rom image and all tests passed
until it got to the serial tests.  The board displayed the
ASCII $7F character over and over.  I never saw any regular
ASCII text.  Any ideas?  Thanks in advance.  <o:p></o:p>
<o:p> </o:p>
Kip Koon<o:p></o:p>
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Kip Koon

2015-07-26 00:09:32 UTC

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Hi John,

At first I used 115200 baud 8n1 rts/cts, then I tried 9600 baud 8n1 rts/cts. Do I need 8n2. Yes, I probably need to reread the instructions. Quite honestly I did this from memory. Maybe I need to check MY memory. :) Iâm using a crystal frequency of 18.432MHZ for both the test and UNA. Maybe I need a different Oscillator for testing?

Kip Koon

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From: ***@googlegroups.com [mailto:***@googlegroups.com] On Behalf Of John Coffman
Sent: Saturday, July 25, 2015 8:48 AM
To: ***@googlegroups.com
Subject: Re: [N8VEM: 19897] Troubleshooting UNA boot rom on Mark IV

Are you booting at 9600 bps to start? Are you waiting long enough while UNA determines the crystal frequency? 10 seconds, minimum. This happens only on the first cold boot, or a cold startup requested from Setup.

You should get the test ROM working first. However, the baud rate will depend on your crystal. See the instructions.

If the test ROM does not pass all tests, then UNA is unlikely to come up.

--John

On 07/25/2015 04:53 AM, Kip Koon wrote:

Hi Guys,

Iâm programed the UNA boot rom into the 512KB flash chip, but when I power up the board, I get only 4 flashes of the yellow led. Iâm told there should be 10. Before this, I had ran the test rom image and all tests passed until it got to the serial tests. The board displayed the ASCII $7F character over and over. I never saw any regular ASCII text. Any ideas? Thanks in advance.

Kip Koon

***@sc.rr.com

http://www.cocopedia.com/wiki/index.php/Kip_Koon
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John Coffman

2015-07-26 05:39:36 UTC

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There is a 0README.TXT file of instructions for the TEST ROM.  It is
in the distributed ZIP.  
 
18.432Mhz is the oscillator everyone is using.  The most basic UNA
instruction is:  the un-configured system comes up at 9600 baud.  If
you want to use any higher or lower standard rate, specify it in
Setup.  But do the test ROM first. 
 
--John 
 
 
 
 
On 07/25/2015 05:09 PM, Kip Koon wrote:
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Hi
John,<o:p></o:p>
At
first I used 115200 baud 8n1 rts/cts, then I tried 9600 baud
8n1 rts/cts.Â  Do I need 8n2.Â  Yes, I probably need to
reread the instructions.Â  Quite honestly I did this from
memory.Â  Maybe I need to check MY memory.Â  :)Â  Iâ€™m
using a crystal frequency of 18.432MHZ for both the test and
UNA.Â  Maybe I need a different Oscillator for testing?Â  <o:p></o:p>
<o:p> </o:p>
<div>
Kip Koon<o:p></o:p>
<a moz-do-not-send="true"
href="mailto:***@sc.rr.com">***@sc.rr.com</a><o:p></o:p>
<a moz-do-not-send="true"
href="http://www.cocopedia.com/wiki/index.php/Kip_Koon">http://www.cocopedia.com/wiki/index.php/Kip_Koon</a><o:p></o:p>
<o:p> </o:p>
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<o:p> </o:p>
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From: <a class="moz-txt-link-abbreviated" href="mailto:***@googlegroups.com">***@googlegroups.com</a>
[<a class="moz-txt-link-freetext" href="mailto:***@googlegroups.com">mailto:***@googlegroups.com</a>] On Behalf Of John
Coffman 
Sent: Saturday, July 25, 2015 8:48 AM 
To: <a class="moz-txt-link-abbreviated" href="mailto:***@googlegroups.com">***@googlegroups.com</a> 
Subject: Re: [N8VEM: 19897] Troubleshooting UNA
boot rom on Mark IV<o:p></o:p>
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<o:p> </o:p>
Are you booting at 9600 bps to start?  Are
you waiting long enough while UNA determines the crystal
frequency?  10 seconds, minimum.  This happens only on the
first cold boot, or a cold startup requested from Setup. 
 
You should get the test ROM working first.  However, the baud
rate will depend on your crystal.  See the instructions. 
 
If the test ROM does not pass all tests, then UNA is unlikely
to come up. 
 
--John 
 
 
 
 
On 07/25/2015 04:53 AM, Kip Koon wrote: <o:p></o:p>
Hi Guys,<o:p></o:p>
Iâ€™m programed the UNA boot rom into the
512KB flash chip, but when I power up the board, I get only 4
flashes of the yellow led.  Iâ€™m told there should be 10. 
Before this, I had ran the test rom image and all tests passed
until it got to the serial tests.  The board displayed the
ASCII $7F character over and over.  I never saw any regular
ASCII text.  Any ideas?  Thanks in advance.  <o:p></o:p>
 <o:p></o:p>
Kip Koon<o:p></o:p>
<a
moz-do-not-send="true" href="mailto:***@sc.rr.com">***@sc.rr.com</a><o:p></o:p>
<a
moz-do-not-send="true"
href="http://www.cocopedia.com/wiki/index.php/Kip_Koon">http://www.cocopedia.com/wiki/index.php/Kip_Koon</a><o:p></o:p>
 <o:p></o:p>
 <o:p></o:p>
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