[Open-graphics] A really good immediate use for OGD1: PCI bus analyzer

[Daniel Rozsnyó]

> 	You can configure it to have an internal UART?  Of course you can,
> it's an FPGA.  I should have thought of that.  So then it needs an adapter
> cable to bring the serial port signals from the accessory header out to a
> DE-9S connector.  However, they're at low logic levels, and may not work
> reliably with a terminal or user PC that expects RS-232 levels.  The obvious
> solution is a "tool" board, with an RS-232 hardware interface on it.  That's
> one chip and a litle discrete glue to provide suitable voltages and I/O
> overvoltage protection.  If this goes ahead, let me know, and I can probably
> whip up a circuit design and board layout instructions in short order.
> 

I did one myself for 5V TTL (to configure a LCD controller board). For
use with OGP you just replace the IC with its 3.3V variant (MAX3232).

http://diary.rozsnyo.com/2006/03/03/rs232ttl/

Daniel