Re: IIgs Cassette Interface

[mspangler <mspangler@gemsi.com>]

On Jul 24, 3:45 pm, "sfahey" <sfa...@a2central.com.remove-yxz-this>
wrote:
>   To: bnfmsgeek
>   Re: IIgs Cassette Interface
>   By: bnfmsgeek to comp.sys.apple2 on Tue Jul 24 2007 09:48 p
> m
>
>  > Does anyone know if you can get a cassette interface for the IIgs? I
>  > am getting an IIgs soon and I'm trying to figure out how I'm going get
>  > disk images from the internet to the 5 1/4 floppies through ADTPro. I
>  > don't have access to an older Macintosh (or newer, for that matter),
>  > or PC with a serial port, and I don't want to spend a boatload of
>  > money.
>
> Sorry - the GS doesn't have one. You're probably going to be best off buying an
> CFFA card ($105) and using CiderPress (free) for Windows.
>
> An older Mac would be cheaper, but at the same time, may be harder to get on
> the Internet.
>
> Or, you could just add a serial port to your PC... if it's a laptop, you
> probably have USB or PCMCIA ... just get a conversion device.
>
> Then you can use ADTPro.
>
> Sean Fahey
>
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> A2Central.com - Your total source for Apple II computing.


But if you are determined to suffer, you could reproduce the cassette
input on a circuit card using a 741 op amp, a capacitor, and a couple
of resistors. Wire the 741 output to the game port (pin 9?) to get the
bit to C060, and you are ready to go. Oh, you'll have to use the
monitor to input the cassette read code into RAM, and then jump to
it.

Schematics and assembly code should be on the web somewhere. Look for
the RedBook. Or Understanding the Apple II for the hardware, and any
rom image for the code.

Using a a USB to serial converter should be much simpler, but
duplicating a cassette input port is possible.