Re: [Uisp-dev] usb-parallel port adapter unit with uisp in linux?

[Theodore A. Roth]

On Tue, 2 Nov 2004, Margarita Manterola wrote:

> On Mon, 01 Nov 2004 18:22:14 -0800, Matthew Wong <address@hidden> wrote:
> > For those with laptops that have no paralllel ports built in, has anyone
> > had success using a usb-parallel port adapter unit with uisp in linux?
>
> There are 3 working __serial__ cables, although I don't know if this
> is an option.  Do these laptops have serial port?

USB to serial adapters work in most cases. The cases that don't work are
the DASA and DAPA type programmer dongles. You loose control of the
individual pin levels when using USB adaptors (both serial and
parallel). There might be some USB-to-rs232 or parallel dongles that can
give you pin level control, but I haven't seen any (note: my USB
experience is very limited).

Another problem I've heard of with laptops is that the parallel ports
often have problems driving enough current to make the parallel port SPI
type dongles work correctly.

For laptops, using serial programmers that use real serial protocols
(over rs232 or via a USB-to-rs232 adaptor) are going to cause the least
headaches. The stk500 protocol programmers are good examples.

---
Ted Roth
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