[E3-hacking] About connecting to the serial on the E3

[Nick Griffin]

I have connected the CP2102 and I am getting garbage text in Putty..

 ▒▒▒▒▒y▒▒7▒w5'=▒▒▒_{g▒S▒▒▒▒{-'7▒▒▒▒▒▒}5w5;1▒myu▒▒▒▒▒▒▒e{▒c}cw▒▒▒▒V▒▒▒▒▒ii▒VW▒▒▒6▒g-%▒▒▒▒▒▒▒▒▒/▒y!75u#7▒▒▒▒▒▒▒▒▒/▒▒▒▒▒_{g▒▒▒▒▒▒▒▒▒▒▒▒▒▒gY▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒y▒▒/▒5%▒%!7'5▒'!=75▒▒gw[▒S▒▒▒▒{-'7▒▒▒▒▒▒}5▒e!7▒9=#▒▒▒▒▒▒▒▒▒▒!▒▒▒▒▒▒▒▒▒▒▒eue▒▒▒▒▒▒▒▒▒▒▒▒▒3'=/▒▒▒▒▒▒▒▒▒▒▒▒_}[eY▒▒▒▒▒▒▒▒▒▒▒▒▒3'=/▒▒▒▒▒▒▒▒▒▒▒▒gw[▒▒▒▒▒▒▒▒▒▒▒▒▒3'=/▒▒▒▒▒▒▒▒▒▒▒▒gmcUO▒▒▒▒▒▒▒▒▒▒▒▒▒3'=/▒▒▒▒▒▒▒▒▒▒▒▒▒Q▒+
                                               ▒▒'5▒▒▒▒▒9/59)-#1▒gw[▒S▒▒=▒▒▒▒▒▒▒▒▒▒▒='-5▒▒▒▒'!=7▒▒▒▒▒▒▒▒▒▒▒9/59)-#1▒gmcUO▒S▒▒=▒▒▒▒▒▒▒▒▒▒▒='-5▒▒▒▒'!=7▒▒▒▒▒▒▒▒▒▒▒9/59)-#1▒eue▒S▒▒=▒▒▒▒▒▒▒▒▒▒▒='-5▒▒▒▒'!=7▒▒▒s▒▒▒▒▒▒▒9/59)-#1▒_}[eY▒S▒▒=▒▒▒▒▒▒▒▒▒▒▒='-5▒▒▒▒'!=7▒▒▒▒▒▒▒▒▒▒뗿e!7'5▒557▒▒▒▒=▒='-7▒▒▒gw[▒/-#)▒1'!;='▒#%;53!/5%▒-▒▒▒▒▒s!#7▒%!7▒▒gmcUO▒▒S▒▒▒=▒▒▒▒▒▒▒▒▒▒▒s!#7▒%!7▒▒_}[eY▒▒S▒▒▒=▒▒▒▒▒▒▒▒▒▒▒g-#▒9!%%=#7▒'-#▒!▒57-▒▒▒▒s!#7▒%!7▒▒gmcUO▒▒S▒▒▒=▒▒▒▒▒▒▒▒▒▒▒U▒!#7▒▒▒g-#▒=▒=%▒▒}#
                                             *▒-#1▒g-#▒▒▒▒▒
                                                           ▒:▒▒

                                                               ▒-#1▒/5▒)5'▒▒▒Vi▒▒5▒▒▒▒▒▒A%'▒▒▒=%▒75'=▒▒75▒▒'-#▒▒▒▒W-7▒;▒▒--!#▒▒▒▒▒=9/-#5▒▒}eY▒wugW}▒ae}_▒▒▒▒▒▒J!75%▒5#=;'5▒▒▒▒▒a#▒#!75▒▒▒!='=15▒▒▒▒▒▒▒▒!#5▒▒▒▒▒▒▒▒▒▒=15▒▒▒!#5▒▒▒▒▒▒▒=15▒▒▒!#5▒▒▒5▒9%3▒▒▒▒#▒▒-#-▒▒=9%3▒-#5▒▒9!#!'5▒
▒75▒737;▒▒=%A%%!7A;=5▒▒▒▒sss▒▒▒▒=%A%%!7A-
                                         5▒▒sss▒%5%▒▒▒e▒=%A%!7A5
▒'!!▒▒▒▒dً▒▒{!1!em_Y▒▒YMIH▒h▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒!#!'5▒▒9!'!7%%
▒9!#3-17▒▒V]▒▒▒▒▒[S[▒▒VM▒▒:▒▒-55▒▒▒▒9▒▒▒▒▒▒▒▒▒▒▒▒▒▒-/▒#!▒5'▒!-!#▒5#=;'57▒▒▒Q(▒▒▒뺿▒333;▒▒▒▒▒▒-▒▒▒▒▒▒-▒=▒ae}_▒U}[W▒▒▒Q(▒▒▒뺿▒5;▒▒▒▒▒▒▒▒-▒▒▒▒▒▒-▒=~Y%=Yey▒▒HIOT▒9▒▒[Wy▒!5▒5▒755957▒▒▒*▒▒▒▒u#=;'-#1▒[Wy▒▒▒▒S:▒%5▒y'!9)▒w▒▒▒▒▒▒R▒JZ▒▒▒▒'!▒555▒▒;=9/▒▒▒▒▒▒▒ݵe▒▒7-#--='-
                  57▒▒▒▒▒[}e▒7-)▒!3▒▒▒▒▒i▒-
                                           5▒▒▒▒▒▒;'!9)-
                                                        5▒▒W▒u▒#▒s{▒▒9▒▒▒▒▒▒▒[-715[#▒▒m#9▒▒▒V
             Jj▒▒

Spanner..

From: David Given<mailto:dg at cowlark.com>
Sent: ‎Thursday‎, ‎4‎ ‎April‎ ‎2019 ‎15‎:‎31
To: Discussion of the Amstrad E3 emailer hardware/software<mailto:e3-hacking at earth.li>

Yes, you're right, that's clearly nonsense.

Why would the E3 generate an inverted signal, anyway? If it's just the raw output from the processor (which I think it is) then it should be standard TTL levels, because it's supposed to be fed into something like a MAX232 for conversion to RS232 levels. Inverting it but leaving it at TTL seems very odd.

On Thu, 4 Apr 2019, 14:25 Sean Furey, <sean-lists-e3-hacking at furey.me.uk<mailto:sean-lists-e3-hacking at furey.me.uk>> wrote:
On Thu, Apr 04, 2019 at 12:18:56PM +0200, David Given wrote:
> Provided the E3 and the USB device ran off isolated supplies, you might be
> able to get away with connecting the 5V (or whatever) on the USB adapter to
> the GND on the jack. That would cause the logic levels to be interpreted
> inverted.

I'd have thought that would make the USB dev see the E3's 0V - 5V as 5V - 10V, and the E3 to see the USB's 0V - 5V as -5V - 0V.  Which doesn't sound like it helps - am I missing something?

Sean

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