Re: CP/M card question

[ehuttich@uboot.com (Wolfgang)]

Patrick Schaefer <PSchaefer@epost.de> wrote in message news:<3BCB1CDB.C580E0F2@epost.de>...
> Wolfgang schrieb:
> 
> > I received a Cirtech CP/M IIe Card (picture at
> > http://www.gtfch.org/tmp/cpmcard.jpeg ) as a gift, including the
> > manual.
> 
> Are you sure it is for a IIe? Usually these cards were designed for the
> IIc (the laptop). Apple IIe have slots, this is the easier way to access
> the bus signals.
> 

Yes, I'm shure. Because this card was running in a //e and on manual
page 1 is written "CP/M PUS SYSTEM F�R DEN APPLE //e".
But you are right, the was another card for the Apple //c and a slot
card for the //gs.  All manufactured by Cirtech.

> I have drawn a schematic diagram of the card revision with only one
> cable. This cable picks up the 7M signal, it is fed into pin 5 of IC2b
> (a 74LS02 - you cannot see this because these guys have removed the
> printings from the ICs). 
> 
> Where is the second cable connected to? Or is it just a ground line for
> improved EMC performance?
> 
The cable is connected to pin 4 and pin 6 of the chip. The chip (16
pin) is labeled: Texas Instruments, PORT???? 8441B, SN ??????. Sorry,
but the printing was removed, a bad habit of the company in those
days.

Wolfgang