Re: Re: converting a Yamaha CX-11 from MSX1 to MSX2

"Alexandre Souza [email protected] [YamahaDX]" <[email protected]>
Newsgroups gmane.music.equipment.yamaha-dx
Message-ID <CANdZFKQenCQcNGv4nve01DefTZdTtcupT3T5EXdA9W-A_yEYdQ@mail.gmail.com> 
That eprom chip is a curious thing. This is a ceramic subsstrate with a
pair of 27128 PLCC EPROMs and a 74ls04 inverter hex chip. It efectively
simulates a 27256 chip. Nothing else. Why it was used in place of a 27256 I
cannot understand...


2018-07-25 13:36 GMT-03:00 [email protected] [YamahaDX] <
[email protected]>:

>
>
> That's very impressive!
>
> I'm curious about what is going on with the EPROM chip. Is it a hybrid of
> some sort?
>
> https://3.bp.blogspot.com/-gl4_lH_BLRI/W1WXpT84wLI/AAAAAAAAW-c/t2-_
> jrsm0Jg3I5cQXEmCH27csAQswW-swCLcBGAs/s1600/motherboard.jpg
> 
>
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