> OK, thanks. FWIW here is the serial board we are using:
>
> http://www.moschip.com/html/MCS9845.html
>
> The hardware guy says "The mn9845cv, have in default 2 serial ports and
> one ISA bus, where we have connected the tl16c554, quad serial port."
>
> Hopefully Ingo's latency tracer can tell me what is holding off
> interrupts.
That may be an interrupt-sharing issue: quad port often use at most two irq lines and, FWIK, ISA irqs are edge-triggered, not level-triggered. Are you tring to use two MIDI ports at the same time?
Giampaolo
>
> Lee
>
>
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