Re: Apple //e Upgrade Failed?

["Bryan Parkoff" <none@nospam.net>]

"Bill Garber" <willy46pa@comcast.net> wrote in message 
jfOdnVSKffmSKpjZnZ2dnUVZ_sidnZ2d@comcast.com">news:jfOdnVSKffmSKpjZnZ2dnUVZ_sidnZ2d@comcast.com...
>
> "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
>
>
Bill,

    No, I stated earlier.  Video ROM chip with MouseText, 6502 CPU, and 
unenhanced Apple //e's CD-EF ROM chips are working fine.  I do not encounter 
any problems with video ROM chip.  The problem is that it has to deal with 
65C02 CPU.  I will try to swap CD-EF ROM chips to be enhanced Apple //e 
while 6502 CPU remains.  If it is working fine, it may be a problem with 
65C02 CPU.

Bryan Parkoff