Hi Mark,

Which FTDI drivers did you install? The VCP (Virtual COM port) or D2XX
(Direct DLL) versions? - I recommend the VCP ones to get started with.

Firstly uninstall whatever FTDI drivers are installed now, and restart
W98. Then, plug in your FT232 board.

What should happen (under W98) is that windows starts the 'New hardware
dialogue', you say, 'install from a specific location' and browse to
your copy of the VCP drivers, which then install OK because the driver
inf file entries for VID & PID matches the VID & PID held on the FT232
which default to VID=0401 and PID=6001.

If this process does not work, I'd be looking at the FT232 circuitry
surrounding USBDM / USBDP, and the 6Mhz clock.

Adding the external EEPROM allows you to program custom VID, PID and
Device ID strings, but is not actually required for a basis USB - >
RS232 converter.

BTW, the FT232BM part replaces the FT8U232AM part, and has quite a few
fixes, and is easier to use. I have designed boards using this 'BM'
part, and have been very impressed with it.

Regards, Peter Moreton


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Marcelo Puhl
Sent: 17 July 2003 05:00
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]:FTDI USB question

        Hi,

        I'm trying to use the FT8U232AM in a new project but can't
install
the drivers for it. Have downloaded the last FTDI drivers, but no luck.
        When I connect the USB cable to the device, W98 recognize it but
tells me I have an "unknown device". Tried manually updating the driver
but W98 finds nothing to upgrade...
        The hardware seems to be ok. I didn't install an EEPROM. Is it a
problem?

        Thanks for any help.
        Mark

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