New GS/new accelerator

[bobryan9@my-deja.com]

Facts:
Apple IIs have a 1 Mhz bus.
1 Mhz video

Apple II accelerator (TWGS)
can run at 16 Mhz if you're lucky
boosting speed from 2.8 to 7Mhz seems like a big increase when you run
programs
boosting speed from 7Mhz to 15Mhz seems like a very small increase when
you run programs

Apple II accelerators can have a 100Mhz processor, and still be hardly
faster than a 15Mhz accelerator, because of the bottleneck of the 1Mhz
bus and 1 Mhz video.

You want an Apple II accelerator.  I do too.  I want my Apple IIgs to
go fast.

You will not get an Apple II accelerator that will go very much faster
than 15Mhz that will plug directly into the Apple II and output video
through the video or RGB connectors on the back of the computer.  It
just won't work.

You want to use all of your old hardware.  Ramfast, Apple SCSI, Super
drive, etc.  Understandable.

Completely redesign the motherboard or use a PC motherboard like
someone suggested here!

Redesign:  Start from scratch.  Put slot connectors that will directly
accept apple II cards.  Probably take a long time, and it will be
expensive to produce.

Use an existing motherboard: Already built.  Just interface a 65816
(65832?  65864?) to the processor socket.  Create a 65816 video
driver.  Build either adaptors (plug adaptor into PCI/ISA socket, plug
apple II card into adaptor), or make a PCI/ISA card that has a cable
that runs to a card you built for the GS.  It could be just a straight
through cable/card combination.  Just connect the Data lines.  You
might want a buffer.

Advantages:  Use all your own Apple II cards.  Use high resolution
video capture and other types of PC interface boards.  High speed disk,
memory, video access.

My .02 dollars.  Haveaniceday.

Bob


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