Re: Restoring Apple II. 6502 types?

["Vince Briel" <vbrielnospamme@comcast.net>]

> I have another question. I think there may have been an
> electrical connection made between 2 of the pins on the old
> 6502 I'm replacing, because of corrosion. What are the odds
> that some of my ROM chips are fried because of it? The last

It's possible, what 2 pins shorted?

> time I turned the ][ on the screen filled completely with
> some kind symbol (@ marks?). I'm not going to turn it on
> again until I replace the 6502. When I first turned it on
> there was what I think was a machine language prompt (*).

This is normal for a straight Apple II. If you press contrl reset it should
reset back to a ''*" prompt. Control B puts you in basic.

> There was a language card installed. I couldn't get the
> keyboard to type anything. I turned it off and turned it on
> again and had the same Apple ][ at the top, the * prompt,
> and some garbage on the screen. The third time I booted I
> got the screen filled with those marks.

I've seen keyboards so dirty that they don't type anything, check the cable
connection from keyboard to mainboard. Does the power light come on?

>
> Of the three 6502 pins that were bad, two were so corroded
> that they were just not there anymore. It looked like rust.
> The socket looks like it just needs some cleaning.

Removing and reinserting the IC's will clean the sockets for you. Remember
static can cause damage. Touch the power supply case to make sure you are
grounded the same as the system before touching anything.

Keep in touch.

Vince


--
Replica I
The Apple I clone

http://www.applefritter.com/apple1/members/replica1/index.htm