8 Aug
2006
8 Aug
'06
4:50 p.m.
woodelf wrote:
Don wrote:
Pretty skimpy to try to work with just 8 bytes of RAM :>
(and F would be difficult to access).
The '7180 was a great part during it day as it had 512 bytes
of RAM, internal (and 16K of OTP). I would use them to
throw together dog-and-ponies for prospective clients.
You could even *leave* the prototype with them and not
fear that they were going to "dump the ROM"... ;>
Alternate registers are useful for interrupt
handlers -- *if*
you ensure that they can't be nested. You can cheat and
use AF in one IRQ and the other pairs (EXX) in another IRQ
(of course, assuming you only need AF in the one and don't
need A or F in the other! :> )
Well one use could be a dedicated controler --
IO ports,
ROM,CPU and OSC. The alternate set would provide the ram.