:Both the 8080 and 8085 supported vectored interrupts to a limited :extent. The 6800 and 6809 don't support vectored interrupts. The :Z-80, 68000 and 8086 all fully support vectored interrupts. But the :Z-80 and 68000 both need the designer to (exclusively) use the Z-80 or :68000 peripheral chips in order to take advantage of their vectored :interrupts. Using a separate interrupt controller means that you can :use bog-standard peripherals that just have INTR outputs. : :It's a pity that the modern PC is hamstrung by design decisions made :over 25 years ago. : :-- :Peter Jeremy The 68000 had a nice system, and you didn't have to use 68000 peripheral chips to take advantage of it. You could a auto-vector the IACK cycle for certain SPLs (the poor man's solution) or, even better, you could map RAM into the autovector space (basically ignore the FC lines) and then use a simple 8:3 (or other) selector to generate the vector for some or the SPLs for chips that could not generate one themselves. It's sad to know that a single 20 year + old $0.10 14 pin chip can outdo an APIC. -Matt Matthew Dillon <dillon_at_backplane.com>Received on Mon Apr 11 2005 - 13:27:48 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:31 UTC