The Sinclair QL Forum

Working now.... sometimes I think technology just screws with us for fun.

I found it!!!!!!

After hours of tearing my hair out over this one, I've finally found it.
Apparently as part of the PC spec UART (8250, 16450, etc) the user pin OUT2 is used as an interrupt enable. FFS!
I eventually traced it down to the line where I set up the MCR according to the chosen flow ...

It seems that IRQ 3 (dunno about 4) is completely unaffected by the external interrupt enable register, and the only way I can stop it jabbering is to read IIR and then RHR on the UART.

Hmmmmm, didn't work. I had to log in again today.

I can see the cookies and I can see their expiry date set to next year, but for some reason once the session has expired (overnight) I have to login again.

Ok, I've done that. I'll see what happens tomorrow.

Hello, this is a message for the keepers or the fora website.
Recently, it seems that I am having to log in every time I visit the site, regardless of whether the "Remember Me" box ish checked.

Ok, this is weird.

I'm trying to get interrupt driven serial IO working.
I currently have SER1 (COM1 0x3f8) being used as a polled debug port (no interrupts)

I am using SER2 (COM2 0x2f8 IRQ 3) for my test device.

Initially, I found that IRQ 3 jabbered incessantly regardless of the state of the ...

Another question: Interrupts again

I'm having a bit of difficulty with serial port interrupts in that once triggered, it just jabbers continuously and I can't seem to stop it. Unlike the frame interrupt and DAC interrupt, there doesn't appear to be any register to acknowledge ISA interrupts.
Is ...

Thank you

Thanks Derek, but I already have this information. This is about the master chip register and how it responds to the IRQs presented on the ISA bus.