Re: Re: Turbo232 UART Cart HDL

From: hwarin_at_neuf.fr Date: Sun, 15 Dec 2013 21:07:33 +0100 (CET) Message-ID: <1795267.489949.1387138053102.JavaMail.www@wsfrf1125>

Hi, Spiro

From the picture, this is a classical 1.8432Mhz crystal.

Regards - Hervé

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Message du : 15/12/2013 20:55
De : "Spiro Trikaliotis " <ml-cbmhackers@trikaliotis.net>
A : cbm-hackers@musoftware.de
Copie à : 
Sujet : Re: Turbo232 UART Cart HDL

 Hello Mike,

* On Fri, Dec 13, 2013 at 01:02:11PM -0800 Mike Naberezny wrote:

> I have a HART cartridge. I added a page for it:
> http://mikenaberezny.com/hardware/c64-128/hatronics-hart-rs-232/

Thank you for the info.

So, if I understand it correctly: The HART interface

- has a 8250 as UART
- maps the registers at $DE18-$DE1F (read) and $DF18-$DF1F (write)
- generates NMI whenever the 8250 generates an interrupt

Can you tell what crystal is used for the baud rate generator?

I think this should be enough info to rebuild the cartridge, if I do not
miss anything.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis
http://www.trikaliotis.net/

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