Re: coding the Z80 and 6510
                                       
   From: w_gayk@NOSPAMbielefeld.netsurf.de (Brix)
   Reply to: Brix
   Date: Tue, 3 Nov 1998 21:13:49 +0100
   Organization: [Customers of] IS Internet Services GmbH & Co, Hamburg
   References:
          <70r5ec$8jp$17@newsreader1.core.theplanet.net> 
          <3635b416.21822437@news.telepac.pt> 
          <MPG.10a2d97aba2f5242989722@news.uni-x.net> 
          <16476-agent.imc@comlab.ox.ac.uk> 
          <MPG.10a526788e4c1899989738@news.uni-x.net> 
          <1663.608T139T12920647@bunty.hoven>


> The LDIR command copies the byte in (HL) to (DE), increments HL and DE,
> decrements BC, and repeats until BC=0.

This opcode it quite useful it seems.. similar to the MOV command on 68000s?

> Of course, this is only a trivial example, and no doubt there are other
> situations where the tables are turned.
> The 6510 is certainly more
> efficient in terms of cycle usage, but this example suggests that the
> Z80's generally higher clock speeds more than compensate for it.

That is exactly what I'm telling all the time. Clockrates do not always matter.
What we see here, is that the Z80 and the 6510 are "about" the same when it com
es to
performance.
Of course there are situations like this when Z80 is faster and of course there
 are
situation that are different.
-Brix-