3 Aug
2001
3 Aug
'01
3:28 a.m.
But do you think it possible for you to scan the schematics?
Br Marko
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)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