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Hi, friends,

I'm ready to make your Mockingboard 4c

What is Mockingboard 4c?

Thank you Mr. Rob Ivy for this great video.

Dear Friends,

This is 2nd commercial version of Mockingboard 4c.

First version was sold out so, I needed to prepare more PCB for Mockingboard 4c.

I little adjust the sound input level and sound doesn't off to avoid OFF popping sound.

And CPU little relocated to upper for easy soldering for me.

Sound little improved and easier to solder by me.

I'm testing compatibility and works 100% as Mockingboard C.

Please wait some weeks for next batch of Mockingboard 4c.

Thank you

Ian Kim

Dear friends,

I developed the SD Music card to enhance old mockingboard of APPLE II.

In fact, I love this approach and sound quality.

In that version,

I replaced all electrolytic capacitors to tantalum capacitors for better sound quality and life.

And used RC filter on output AMP and some more improved.

But, It has compatibility issue following part's LOT#. It means that some chips works on some model with some software running.

In fact, After made this board, I've tested it on my APPLE //e and ][+ with SKYFOX and Ultima 4,5 before to ship. All fine then I sent it.

It works fine on APPLE //e even IIGS with Mockingboard patch.

But, I found it didn't work some software and some of APPLE ][+ model.

I really having hard time to find this cause...

It is happen because of the 6522 timing doesn't match well on APPLE II with 6502 CPU.

With some more research, I could find good way to overcome this issue and quickly applied on new PCB for SD Music card.

Sample card ordered and waiting for this.

On the CPLD testing, It works perfect on my APPLE //e and ][+ with all softwares.

and will test some of APPLE ][+ clones..

Please wait for some weeks for new board.

I will post when I have new board with testing results.

** NOTICE **

If you are not happy with your old version of SD Music card due to compatible issue, I will replace your card to new one. 

Please ask me the address and send your card with sure way.

When I received it, I will send new board for you. 

* I will test all arrived board, 

it if it failed to work with some another reason, It will be charged some costs,

Good working conditioned board will be replaced without return shipping charge.

Thank you very much;

Ian Kim

1st Mockingboard 4c all sold out and preparing another revision.

In this version have minor upgrade, Enhanced sound quality.

1st Mockingboard 4c sound little like over driven sound so, I tuned it under proper level, It's little better.

And the CPU socket was relocated to upper for easy soldering. I had hard to solder this area...

It is testing board.

There is no Mute pin but, I will keep the Mute pin even rare used by user.

Ordered another sample PCB for testing..

Thanks for waiting. It will coming soon for you.

I'm seldom playing game with joystick.

I have one and it s just modified from PC one to APPLE ][+.

One of friend asked me to develop analogue joystick.

And I aware a lots of members are having problem with their old joystick..

hence, I searched and found good concept even lower variable resistor could be used for joystick.

I just reminded the NE555 concept..

I will work even lower resistance..

Will use these days components for easy maintenance.

I ordered some PCB and waiting for it.

Let's see if it works properly or have any issue.

** PCB Arrived and assembled **