Re: California Games For The Apple IIc+

[Michael J. Mahon <mjmahon@aol.com>]

David Schmidt <schmidtd@my-deja.com> wrote:
> On 9/27/2012 8:22 AM, J. Vernet wrote:
>> Le 26/09/2012 15:48, David Schmidt a écrit :
>>> On 9/26/2012 9:32 AM, Tempest wrote:
>> 
>>> The IIc+ automatically starts in 4MHz mode; holding down escape during
>>> boot will start in 1MHz.  If you make an image of the disk, we can try
>>> it in an emulator, speed it up, and see...
> 
>> Is there a way to change the speed via POKE&PEEK on a //c+, or software,
>> like with a ZIPChip on IIe  ?
> 
> It works the same as a ZipChip, because that's what it really is.
> 
> 	lda #$5a
> 	sta $c05a
> 	sta $c05a
> 	sta $c05a
> 	sta $c05a	; Unlock ZipChip
> 
> 	lda #$00
> 	sta $c05a	; Disable ZipChip	
> 
> [do slow stuff]
> 
> 	lda #$00
> 	sta $c05b	; Enable ZipChip
> 
> 	lda #$a5
> 	sta $c05a	; Lock ZipChip

Or if you just want to slow down for 50 milliseconds, reference a 5.25"
disk slot by, for example, turning the drive motor off (always benign). 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon