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From: rbourass@udenva.UUCP
Newsgroups: comp.sys.m6809
Subject: RS232 PAK HELP!!!
Message-ID: <2784@udenva.UUCP>
Date: Sat, 24-Jan-87 13:26:11 EST
Article-I.D.: udenva.2784
Posted: Sat Jan 24 13:26:11 1987
Date-Received: Sun, 25-Jan-87 14:37:02 EST
Organization: U of Denver
Lines: 56


I want to thank every one who responded to 
my plea for help with the RS232 Pak. Through
your comments I have the PAK and DRIVE working
together on my Y-CABLE with PIN 8 connected.
I am curious as to why Rainbow suggested
otherwise...

 
	By slightly modifying the RS232 PAK
	it can be adapted to work with a
	Y cable and disk drive.

	Removing the ROM chip (U3) eliminates
	the memory conflict between Disk BASIC
	and the Pak ROM. ***Cutting the wire
	jumper connecting pads E1 and E2 
	separates the IRQ of the ACAI from
	positions 4 and 8 of the cartridge
	connector***.

	***If the jumper is not cut, any data
	input causes the IRQ to become active
	which triggers the non-maskable 
	interrupt and the cartridge inter-
	rupt detection input of the computer.
	When the CART Pin is active, the
	computer resets.  If you have the 
	disk controller connected, the
	computer shows the opening credits***.


I am sure the entire problem could be my interpreting
of this article, but I would really appreciate it if
someone well versed in the hardware area could explain
this to me and tell me if there are any other modifications
I should make to insure that I have no problems.
I just can't afford the multipak, even at its sale price.
I also believe there are probably some other people
interested in the RS232 PAK that are too shy to speak up,
so it might be a good idea to post the explanation on the
net rather than just sending it to me. Either way will be 
greatly appreciated.

Thanks again,
Rich


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