But do you think it possible for you to scan the schematics?
Br Marko
----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Thursday, August 02, 2001 11:21 PM
Subject: Re: Epson HX-20
> > I got one old (is there any new =) ) Epson HX-20 and i wonder if there
is
> > some manual or some other information about how to program it in
assembler?
> > Is there any hardware information so that i could know on which
addresses
> > the periphal is on and how to access it?
>
> I have the hardware manual for the HX20, which includes schematics, etc.
> I should therefore be fairly easy to work out the memory map of the main
> processor (assuming it's not already in the manual).
>
> Problem is, there are 2 processors in there. One runs the user programs
> and does some I/O, the other does timing-criitcal I/O. And there's no
> information on the second processor in the manual. Well, OK, we know what
> it is, and how it's wired up, but this one runs from interal ROM, and
> there's no info on the ROM code or the protocol to talk to it . It
> communcates with the main processor via a serial link, which can also be
> switched so the main processor talks to the Serial (5 pin) socket on the
> back -- the one used for the TF20 disk, etc.
>
> There is supposed to be a software reference manual as well, but I don't
> have it ;-(
>
> -tony
>
Received on Fri Aug 03 2001 - 03:28:22 BST