Re: PET 2001 fix Part 3 - RAM/ROM board etc.

From: Philip Lord <random6000_at_mac.com>
Date: Mon, 16 May 2011 11:00:40 +0900
Message-id: <297B1B3D-7A12-4709-88FD-220FFEA55C44@mac.com>
One thing that Ruud's program confirms is that the left most column 1 and 2 are repeating:
See video at the bottom of the page here:

http://web.me.com/lord_philip/other_computers/20012.html

Phil

On May 16, 2011, at 10:30 AM, Philip Lord wrote:

> Thanks Ruud,
> I tried out your image in a 2532 at H4.
> 
> It displays a set of all the characters, then displays the inverse set, and repeats. I'm assuming this is correct?
> 
> I still have the pixel flicker, and character distortion. I will hopefully be able to get a 74LS165 today, and swap it out sometime soon.
> 
> Thanks again
> 
> Phil
> 
> 
> 
> On May 16, 2011, at 5:42 AM, Ruud@Baltissen.org wrote:
> 
>> Hallo Philip,
>> 
>> 
>>> Any chance you could email me a .bin file of that which I can burn
>>> to a EPROM.
>> 
>> 
>> .ba $F000
>> Reset
>> 		sei
>> 		cld
>> 		
>> ;**  Fill screen with values 0..$FF
>> 		ldx	#0
>> L0
>> 		txa
>> 		sta	$8000,X
>> 		sta	$8100,X
>> 		sta	$8200,X
>> 		sta	$8300,X
>> 		inx
>> 		bne	L0		
>> L1
>> 		beq	L1
>> 
>> 
>> IRQ
>> NMI
>> 		rti
>> 
>> .ba $FFFA
>> .wo NMI
>> .wo Reset
>> .wo IRQ
>> .en
>> 
>> BIN is attached.
>> 
>> 
>>> After burning some BASIC 2 EPROMs, it seems I'm now getting a reset as the
>>> screen fills with garbage than after about 1/2 a second goes completely
>>> blank...I think this is progress.
>> 
>> The blanking is done by the CPU so this is indeed a progress.
>> 
>> 
>> --
>>   ___
>>  / __|__
>> / /  |_/     Groetjes, Ruud Baltissen
>> \ \__|_\
>>  \___|       http://Ruud.C64.org
>> 
>> 
>> 
>> 
>> 
>> 
>> The following section of this message contains a file attachment
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>>  ---- File information -----------
>>    File:  KERNAL2.BIN
>>    Date:  15 May 2011, 22:37
>>    Size:  4096 bytes.
>>    Type:  Unknown
>> <KERNAL2.BIN>
> 
> 
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Received on 2011-05-16 03:00:17

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