Re: 4040

From: William Levak (wlevak_at_cyberspace.org)
Date: 2001-01-05 01:43:36

On Sat, 2 Dec 2000, John Phipps wrote:

> William,
> 
> Looking at the 4040 memory map, is the 6530's timer included in the I/O
> address range 0080-008F? Do you know if it's set up to generate any kind of
> regular interrupt to the 6504?

Yes, the timer is included in the I/O block.  I don't know if the 6530
timer is used for anything.  The interrupts are set by reading or writing
the timer at different addresses (see the 6530 data sheet).  Probably the
only way to find out is to disassemble the 6530 ROM.

The serial ports in the 6530 and 6522 are not used for reading and writing
to the heads.  This is done by a 74LS164 and 74LS165.


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