Memory Chip test issue

[Jack]

hi guys, when  I  tested Memory Chip, there is a message 'echo "Click the Keyboard icon and hold down the 'K' key (uppercase) until you see the next message (it should appear shortly after that) ...' was shown on the bottom of the hardware simulator and then stopped, but I can't find out the Keyboard icon,  is there anything wrong?  
  thanks
 

[cadet1620]

Select Screen from the View dropdown list and there should be a button with the keyboard icon between the screen area and the lower panel showing RAM16K.

--Mark

[Jack]

I have done as you said,  pls help review the print screen,  thanks

[cadet1620]

Please mail me your Memory.hdl so I can see if it has the same problems on my system.  (Use More|Reply to Author to send mail.)  Also I might be able to tell what's happening.  The hardware simulator is not very robust when you use too many of the built-in chips with user interfaces, or use them in unexpected ways.

--Mark

[cadet1620]

Jack's problem was that he had implemented the keyboard using a Register chip instead of a Keyboard chip. Since there was no Keyboard chip in the HDL, the hardware simulator did not show the keyboard UI.

The Keyboard chip is documented in Figure 5.5.

--Mark