Re: Turbo232 UART Cart HDL

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Sun, 15 Dec 2013 21:08:18 +0100 Message-ID: <52AE0C32.4020001@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/15/2013 08:55 PM, Spiro Trikaliotis wrote:
> 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?

The picture shows it as the standard 1.8432 MHz. Which means the maximum 
baudrate would be 115200 Bps.

  Gerrit

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