Re: Plus/4 RS232 woes

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Thu, 6 Sep 2018 19:56:26 +0200 Message-ID: <2f7890d8-5c84-66c2-4450-3de7b28d0e87@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 09/06/2018 07:40 PM, Nils Eilers wrote:
> On Wed, 5 Sep 2018 16:39:44 +0200
> Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:
> 
>> The 6551 doesn't need capacitors or resistors. All you need is to
>> connect the crystal to the two XTAL pins and you're done.
> 
> The W65C51N datasheet shows a schematic at page 19 with a 30 pF capacitor from XTALI to GND and a 1 M-Ohm-resistor from XTALI to XTALO.

Well, that's the 65C51... I was talking about the 6551 and its datasheet 
doesn't mention anything of the sort.

And if you look at the schematics of the Plus/4, you'll see that there 
is only the crystal.

  Gerrit