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Re: Audio cassette interface
Hi all together,
I found in my bookshelf an old Book from Rolf-Dieter Klein from
Germany, Ok, it´s not so "scintific", but has good practice features.
In this book is an CAS-Interface with 1200Baud up to 4800 Baud.
The problem is in Google to attach a file.
I´m sending this and with the replay I´m sending the file. I have no
other choice.
best regards
Wolfgang
On 7 Apr., 03:09, Mr Hector macias lara <hm...@yahoo.com> wrote:
> Hi,
>
> The title of the book is:
> Experiments in microprocessors and digital systems.
> Second edition.
> By Douglas V. Hall / Marybelle B. Hall
> ISBN 0-07-025553-9
>
>
> Note that this book is based on the 8080 and 8085.
> You must design the software for the experiments, but most of
> Them comes with a flowchart.
> It contains 34 experiments.
> I think the most interesting are:
>
> Microcomputer music
> Measuring reaction time with microcomputer
> Speech synthesis
> Interfacing an unencoded keyboard to a microcomputer
> Stepper motors
> Using a D/A converter
> Analog to digital converter
> Serial data input and output with software
> A microcontrolled 2708 eprom programmer
> Microcomputer temperature controller.
>
> Regards,
> Hector
>
>
> ________________________________
> From: Dan Werner <dwe...@dpcpipe.com>
> To: n8...@googlegroups.com
> Sent: Tue, April 6, 2010 3:00:34 PM
> Subject: Re: [N8VEM: 6605] Re: Audio cassette interface
>
> What book is that out of? Looks like very good information to me.
>
> Dan Werner
>
> Mr Hector macias lara <hm...@yahoo.com> wrote:
>
> Hi,
> I am attaching a word document with an experiment I found in one of my
> books.
> It’s about serial data input and output with software.
> Please let me now if this information is useful for the cassette interface
> project, if it is not,
> then I will not upload it to the google group to save space.
>
> Regards,
> Hector
>
> ________________________________
> From: brizza <nbri...@optusnet.com.au>
> To: N8VEM <n8...@googlegroups.com>
> Sent: Mon, April 5, 2010 11:38:14 PM
> Subject: [N8VEM: 6601] Re: Audio cassette interface
>
> Hi Wolfgang,
> Thanks. For now i think i'll stick to a simple design and perhaps work
> my way to this one. This is very interesting :-)
>
> All the Best,
> Nik.
>
> On Apr 6, 8:49 am, Wolfgang Kabatzke <dr.wolfga...@online.de>
> wrote:
>
>
>
> > Hi,
>
> > I found this article from BYTE and this decvice. As I remember I built
> > such interface 25 years ago. It worked with monitor software and CPM -
>
> > > PUN: and RDR:
>
> > Best regards
>
> > Wolfgang
>
> >http://www.swtpc.com/mholley/AC30/AC30_Index.htm
>
> > On 6 Apr., 00:19, brizza <nbri...@optusnet.com.au> wrote:
>
> > > Hi Max,
> > > Yes the baud rate needs to be 300 according to the Kansas City
> > > standard. I think if i can make a romimage that sets the console at
> > > 300 baud and use the VDU board for Keyboard and Monitor then the baud
> > > rate will not be an issue. I plan on making an ECB design with a
> > > seperate UART as Dan suggested earlier but the Z80 peripheral board
> > > may be an easier alternative.
> > > Thanks.
> > > Regards,
> > > Nik
>
> > > On Apr 6, 7:28 am, Max Scane <mjs...@gmail.com> wrote:
>
> > > > If the tape system is using the same hardware as the console then
> you could
> > > > replace PUN: and RDR: with CON: and pip will talk to the console
> interface
> > > > instead think.
>
> > > > I suspect that your tape interface will require a much slower baud
> rate (600
> > > > or 1200) than a normal console though. It might be easier to use a
> separate
> > > > serial interface (such as the Z80 Peripherals card) or a dedicated
> UART.
> > > > You could then add the PUN/RDR driver in CBIOS.
>
> > > > Max.
>
> > > > On Mon, Apr 5, 2010 at 5:46 PM, brizza <nbri...@optusnet.com.au>
> wrote:
> > > > > Hi Max,
> > > > > Thanks for that. The PIP commands will come in very handy! The
> system
> > > > > is attached to the same I/O line that operates the terminal device
> > > > > through the serial port. So the cassette system will appear to the
> > > > > computer as a keyboard when playing back and a display during
> > > > > recording. Not sure about CBIOS drivers. No mention of a punch
> device
> > > > > in the current CBIOS. I would need some help with that if anybody
> is
> > > > > willing?
> > > > > Also this system follows the Kansas City Standard for recording
> and
> > > > > sounds like a very basic interface. I'm hoping it will work out of
> the
> > > > > box :-)
>
> > > > > All the Best,
> > > > > Nik
>
> > > > > On Apr 4, 5:00 pm, Max Scane <mjs...@gmail.com> wrote:
> > > > > > Hi Nik,
>
> > > > > > CP/M was written with punch/reader type storage in mind. There
> is a BIOS
> > > > > > call (punch/reader) that allows you to write/read to these
> devices and
> > > > > these
> > > > > > cals are supported in PIP..
>
> > > > > > Once you have the appropriate drivers in the CBIOS you can use
> pip to
> > > > > > read/write to these devices:
>
> > > > > > eg. read from the reader until EOF is reached:
>
> > > > > > pip text.txt=RDR:
>
> > > > > > or write a file to the punch:
>
> > > > > > pip PUN:=text.txt
>
> > > > > > Nothing else is really needed.
>
> > > > > > Max
>
> > > > > > On Sun, Apr 4, 2010 at 11:00 PM, brizza
>
> <nbri...@optusnet.com.au>
>
>
>
> > > > > wrote:
> > > > > > > Hi,
> > > > > > > I came across an article from 1976 that explains how to build
> a tape
> > > > > > > memory system that uses an RS232 terminal port. I found it
> quite
> > > > > > > interesting and so wired up a prototype board and hope to be
> testing
> > > > > > > it soon with my N8VEM as soon as the chips arrive. Link to
> picture of
> > > > > > > the board minus the chips below. The system is similar to an
> ASR TTY
> > > > > > > paper tape storage system but uses an audio cassette recorder
> instead.
> > > > > > > So i'm hoping to use CP/M's commands to comunicate with the
> interface
> > > > > > > board. All the system really needs to work is software for low
> speed
> > > > > > > paper tape loading and punching, but so far i have'nt been
> able to
> > > > > > > find anything on the internet. Any ideas?
>
> >http://picasaweb.google.com/Brizza62/DropBox#5456258155591248466
>
> > > > > > > Cheers,
> > > > > > > Nik
>
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