Apple ][e keys not registering

7 posts / 0 new
Last post
Offline
Last seen: 3 weeks 12 hours ago
Joined: Mar 13 2008 - 20:57
Posts: 8
Apple ][e keys not registering

  I have been working on one of the original ][e computers (white keys).

There are several keys that just will not register no matter what I have done.

Here is a list of what I have done.

   I have replaced all the ][e enhancment chips - which someone else put in, with the original chips.

   Replaced keyboard rom

   Replaced memory with new

    Replaced keyboard with known good keyboard

    Re-flowed solder on the back of keyboard connector and checked for cold solder and traces

    Cleaned keyboard connector pins

Still have the same characters not responding.

Is there something I am missing?

 

    

 

 

Offline
Last seen: 1 week 2 days ago
Joined: Apr 26 2016 - 08:36
Posts: 182
Which keys don't register?

Which keys don't register?

 

Did you check the socket of the keyboard encoder chip?

 

Offline
Last seen: 3 weeks 12 hours ago
Joined: Mar 13 2008 - 20:57
Posts: 8
Apple ][e keys not responding

 The keys that do not respond on either keyboard are the same:

  5 6 DEL T V \ G J R E T N M UPARROW ~

The socket for the keyboard rom has been cleaned and looks good

I tried another keyboard rom and it did not solve the issue either.

Thanks for any assistance in this issue.

Offline
Last seen: 11 hours 56 min ago
Joined: Jun 25 2020 - 17:00
Posts: 21
orlandoave wrote: The keys
orlandoave wrote:

 The keys that do not respond on either keyboard are the same:

  5 6 DEL T V \ G J R E T N M UPARROW ~

The socket for the keyboard rom has been cleaned and looks good

I tried another keyboard rom and it did not solve the issue either.

Thanks for any assistance in this issue.

 

I see a 8 byte pattern where bits 0 and 1 are missing that are needed for many, but not all, of those characters.

Offline
Last seen: 3 weeks 12 hours ago
Joined: Mar 13 2008 - 20:57
Posts: 8
There must be some chip or

There must be some chip or component causing the issue.  Something the kernal does not pickup.

Offline
Last seen: 17 hours 50 min ago
Joined: Jun 18 2010 - 13:54
Posts: 404
All of the bad keys connect

All of the bad keys connect to the Y5 and Y6 inputs of the Keyboard Encoder. When you said that you tried a different keyboard, did you mean that you plugged in another keyboard to the motherboard socket?

Offline
Last seen: 11 hours 56 min ago
Joined: Jun 25 2020 - 17:00
Posts: 21
It may be more wide spread than that...
jeffmazur wrote:

All of the bad keys connect to the Y5 and Y6 inputs of the Keyboard Encoder. When you said that you tried a different keyboard, did you mean that you plugged in another keyboard to the motherboard socket?

 

Here is a keyboard Yn, Xn matrix for the IIe keyboard and keypad.  Y7  & Y6 related keys are indicated 7 times for the keys mentioned that do not respond, Y3 - 3 times, Y4 - 2 times.  X1 - 4 times,  X3 - 3 times,  X2 - 2 times, with other combinations less.

 

Log in or register to post comments