Re: [stella] An exercise in minimalism...

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Re: [stella] An exercise in minimalism...

Subject: Re: [stella] An exercise in minimalism...
From: "Andrew Davie" <adavie@xxxxxxxxxxxxxxxxx>
Date: Thu, 2 Sep 1999 14:32:54 +1000

I dug up my earlier posting regarding an efficient startup.
Here's my best...


    ; CLEARS ALL VARIABLES, STACK
    ; INIT STACK POINTER
    ; ALSO CLEARS TIA REGISTERS
    ; DOES THIS BY "WRAPPING" THE STACK - UNUSUAL

    LDX #0
    TXS
    PHA            ; BEST WAY TO GET SP=$FF, X=0

    TXA
CLEAR PHA
    DEX
    BNE CLEAR

    ; 9 BYTES TOTAL FOR CLEARING STACK, MEMORY
    ; STACK POINTER NOW $FF, A=X==0


Cheers
A


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Current Thread
Re: [stella] An exercise in minimalism..., (continued) Erik Mooney - Wed, 1 Sep 1999 23:54:13 -0400 (EDT) Andrew Davie - Thu, 2 Sep 1999 00:27:38 -0400 (EDT) Mark De Smet - Thu, 2 Sep 1999 01:08:07 -0400 (EDT) Eckhard Stolberg - Thu, 2 Sep 1999 09:24:41 -0400 (EDT) Andrew Davie - Thu, 2 Sep 1999 00:35:01 -0400 (EDT) <= Glenn Saunders - Sat, 4 Sep 1999 13:58:00 -0400 (EDT) Mark De Smet - Sat, 4 Sep 1999 17:52:59 -0400 (EDT) Glenn Saunders - Sat, 4 Sep 1999 18:53:30 -0400 (EDT)

Current Thread

Re: [stella] An exercise in minimalism..., (continued)
- Erik Mooney - Wed, 1 Sep 1999 23:54:13 -0400 (EDT)
  - Andrew Davie - Thu, 2 Sep 1999 00:27:38 -0400 (EDT)
    - Mark De Smet - Thu, 2 Sep 1999 01:08:07 -0400 (EDT)
    - Eckhard Stolberg - Thu, 2 Sep 1999 09:24:41 -0400 (EDT)
  - Andrew Davie - Thu, 2 Sep 1999 00:35:01 -0400 (EDT) <=
- Glenn Saunders - Sat, 4 Sep 1999 13:58:00 -0400 (EDT)
  - Mark De Smet - Sat, 4 Sep 1999 17:52:59 -0400 (EDT)
    - Glenn Saunders - Sat, 4 Sep 1999 18:53:30 -0400 (EDT)

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Re: [stella] An exercise in minimal, Eckhard Stolberg	Thread	Re: [stella] An exercise in minimal, Glenn Saunders
Re: [stella] An exercise in minimal, Andrew Davie	Date	Re: [stella] VB40032.DLL + Mactari , Chris Pepin
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