Help cure JIM's sick Apple II MLB.

[bieling@terra.es]

Hi Jim,

I'm posting this in
<http://groups.google.com/group/comp.sys.apple2>

Because there there are some clever people with deep apple2 knowlegde
who may be of great help.

So keep watching csa2 as the fix will surely pop up there ... !

Regards,
Jorge.

> JIM,
>
> Try typing GR  (RETURN) and see if the top of the screen clears to black.
> Then try typing HGR  (RETURN) and see if the top of the screen clears to black.
> If it does, type this too:
>
> HCOLOR=3 (RETURN)
> HPLOT 0,0 TO 279,159 (RETURN)
>
> A white line should be drawn across the screen.
>
> Let me know what you get.
>
> Regards,
> Jorge.
>
>> Thank you!
>>
>> This problem has a similar sympton as one I saw where you posted. The
>> "Vertical bars"  but no characters.
>>
>> Last week I finally aquired an original Apple II. I have had a II+ for some
>> time, but just
>> never found an origiinal II for the right price. But this one has a problem
>> that I'm hoping
>> someone can help me with.
>>
>> · The computer turns on with a normal beep.
>> · The monitor lights up, but with a set of maybe 5 pixel wide bars a
>> pixel or so two apart vertically up the screen. In the lower left there
>> is a blinking "cursor", which is actually a block of pixels the size
>> of a character in the second bar, that blinks like a cursor.
>> · The "cursor responds to keyboard input by moving to the right just
>> like it should, but no text.
>> The reset button functions normally, with a beep and a "return" of
>> the cursor on screen.
>> · "Control + G" rings the bell
>> · Typing "Load + Return" cycles through about 10 lines and goes back
>> to the blinking "cursor"
>>
>> Over the weekend, I switched out every chip that is socketed from the
>> Apple II+ to the apple II one section or row at a time. I did RAM,
>> ROMS, processor, everything. (that was a tedious job!)
>> Each and every time there was no change in the symptoms. Also, I
>> tried the II+ power supply and keyboard. I checked the bottom of the
>> board for anything strange, but didn't see anything that looks out of
>> wack.
>>
>> It almost seems like a fault in the location that takes the
>> processor output and keyboard input and converts it or decodes it to
>> ASCII characters for display on the video. If there is such a place,
>> I'm just guessing, I'm not good at the component level.
>>
>> At this point, would you start to replace solid-state components,
>> like resistors, capacitors and transistors? I'm not sure there is
>> anything else left! Unless it is one of the couple of smaller chips
>> (one near the video out, for example) that are soldered on the II+,
>> but not on the II, and I couldn't switch.
>>
>> Any and all help would be greatly appreciated!
>>
>> Thanks,
>> Jim
>>
>> On Sep 11, 2006, at 11:17 AM, Jorge Chamorro Bieling wrote:
>>
>>>> Hi,
>>>>
>>>> I noticed that you gave a very informed answer to a troubleshooting
>>>> problem and was wondering if I might ask you about a problem I am
>>>> having with an Apple II?
>>>>
>>>> Thanks,
>>>> Jim
>>>>
>>>>
>>>
>>> Yes.. What is it ?
>>> 
>>> Regards,
>>> Jorge
>>> 
>>> 
>>> 
>> 
>> 
>