Hi I am fairly sure these questions have been asked before, but I am unable to find the correct thread.
I am trying to find the parts for an empty (totally stripped Apple IIe motherboard). I have questions about to chips. I am reading the Apple IIe Repair Guide by Double Density on A2OL, in the inventory list they mention IC MC741 (OpAmp) in location A11, is this the correct chip, or can it be replaced my an LM741? I know I will most likely not ever need it, as it is the amplifier for the cassette player, still I like the board complete.
The second question I have is the KB ROM in D12, it does not seem to be an Apple ROM (like the HAL, IOU and MMU), but I have not been able to locate any, anyone have a better description of the IC, or any hints where I can find one?
IC question
June 25, 2018 - 8:56pm
#1
IC question
The awnser is not that easy...
about the 741... thats an OP-Amp and its not dependent to the manufacturer...
the KB ROM is not that easy:
it depends first if the IIe is enhanced or not ( with Mousesymbols or without )
read :
http://www.appleii-box.de/D06b_resurectionIIe.htm
to find out if your IIe is enhanced or not and what kind of language version...
read :
http://www.appleii-box.de/H000_Chipsets.htm
to find out if chipset is correct
and at:
http://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Computers/Apple%20II/Apple%20IIe/ROM%20Images/
you may find the correct image for programming the eprom.
Glad the 741 was just a typo, and that was an OP-amp. The card has not arrived in mail yet, so I have to see it before I can try to figure out language version etc. Thank you so much for the help and the links!