Re: Apple //e Upgrade Failed?

["Bill Garber" <willy46pa@comcast.net>]

"Bryan Parkoff" <none@nospam.net> wrote in message 
news:1H4Nf.61744$PL5.37784@newssvr11.news.prodigy.com...
>    I have unenhanced Apple //e.  The model is A2S2064.  The serial number 
> is 1A2S2-D44 0HDK A2S2064.  I replaced from original video ROM chip to new 
> one which it includes MouseText, but it is still in unenhanced Apple //e. 
> It is working fine.
>    I tried to swap from 6502 CPU to 65C02 CPU while CD-EF ROM chips are 
> still unenhanced Apple //e, but it failed to work.  The screen is black 
> nothing.  Also, I tried another 65C02 CPU from Zip Chip to be installed. 
> It did not work and the screen is still black.  It works fine on Apple 
> II+.
>    Do you have a clue what it is causing?  If I get it working correctly, 
> I will swap CD-EF ROM later to be enhanced Apple //e.
>
> Bryan Parkoff


You said you swapped out the Video ROM, and if so, and
the screen is black, then there is either no contact at
some point with the video ROM socket, or nothing is on
the chip. Try putting back the original video ROM and
any CPU and see if it works, and if it does, then there
is a problem with your replacement video ROM.

Bill Garber