Re: Can't read my Apple IIe EF ROM

[oaaland@aol.com (O Aaland)]

>From: vfranco@ix.netcom.com
>Date: Tue, Dec 2, 1997 5:13 PM EDT

>I'm having trouble reading my Apple IIe EF ROM with an
>EEPROM prorgrammer.

>Reading off the EF ROM, I see the following on the ceramic
>package:

>CN75001N
>342-0134-A
>(C)APPLE1982
>SKK8438 AW

>What the heck is this thing?  A Synertek ROM of some sort?

>My Apple IIe Reference Manual, Chapter 7 (Hardware) says
>that the CD and EF ROMs are 2364 ROMs.  The CD ROM actually
>appears to be an NEC 2764 (reading off the ceramic again),
>and I am able to read that just fine with the programmer.

>The schematic says that CD and EF are 2365/2764 devices, so
>I'm not sure what the truth is here.

>A little more info: My IIe motherboard has a rev # of 820-0064-B.
>It is not an enhanced IIe.

>Can anyone tell me how I can read my EF ROM with a EEPROM programmer?
>Any help (posts or e-mail to vfranco@ix.netcom.com) would be much
>appreciated.  Thanks in advance!


I have found with my EEPROM programmer if I set it to read a 27/128
instead of 27/64 the PROM contents appear in the upper 64k of the buffer.
I then move the 64k memory to the begining of the buffer and then I am 
able to write it back to a 27/64 without any problems.

Owen