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Re: wanted: Apple II plus Language Card or RAMCARD schematic
- Subject: Re: wanted: Apple II plus Language Card or RAMCARD schematic
- From: "David Wilson" <mcs6502@gmail.com>
- Date: 26 Jan 2006 04:42:30 -0800
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> "lites" <stonekr2000@yahoo.com> wrote in message
> news:1138272476.977832.291340@g44g2000cwa.googlegroups.com...
> > Hello. I'll plan to make 16KB ram card board by using programmable
> > logic devices, but I need the schematic of the CARD.
> >
> > The ram card is consist of 16Kbit DRAMs and some logic gate ICs.
> >
> > Could anyone give the schematic of the card or describe the diagram?
> > Please, help me.
The schematic can be found on page 5-27 of "Understanding the Apple II"
by Jim Sather (ISBN 0-912985-01-1) - if you cannot source this I should
be able to scan it or take a picture of it. It is a bit difficult to
describe (and not directly usable unless you intend to use 4116 RAM
chips). It would be much simpler to use a 62256 static RAM chip and a
PLD - you avoid the need for the cable to the motherboard RAM array.