Mega65 detection in C64 Mode

In some thread I found the information that POKE 0,65 puts the C64-Mode to 40 MHz.

What's the correct way to detect if we're in C64-Mode on a Mega65?

The line AD=56*64:IF PEEK(53272) AND 32 THEN GOTO 30 doesn't seem to work correctly under rom V920376 anymore

Thanks!

Nice, thanks!

Is there another speed setting beside the 40 MHz?

Quote from Snoopy

Probably one of the shortest way:

PRINT PEEK(44)

In C65 mode the result is 0

In a C64 or C64 mode the result is 8

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So, this also returns 8 in C64-Mode on a C65.

What would I do to find out that I'm actually running in C64-Mode on a C65?

Quote from GoDot

This is how I do it in TSB (which runs in Mega65's C64 mode). I think you can easily replace specific TSB commands by Mega or standard ones). The routine uses $d02f to determine which VIC is running.

Code

1. 100 m65check
2. 110 if v=0 then c$="running on a C64, no changes applied"
3. 120 if v=3 then c$="running on a C65 "
4. 130 if v=4 then c$="running on a Mega65 "
5. 140 print at(1,4)c$
7. 999 end
9. 4100 proc m65check
10. 4110 : v=0:v$="":x=peek($d000):y=peek($d100)
11. 4115 : poke$d02f,0:poke$d02f,0
12. 4120 : poke$d000,1:poke$d02f,165:poke$d02f,150
13. 4130 : poke$d100,0
14. 4140 : if peek($d000)=1 then v=3:v$="VIC III"
15. 4145 : poke$d02f,0:poke$d02f,0
16. 4150 : poke$d000,1:poke$d02f,71:poke$d02f,83
17. 4160 : poke$d100,0
18. 4170 : if peek($d000)=1 then v=4:v$="VIC IV"
19. 4180 : poke$d000,x:poke$d100,y
20. 4190 end proc

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Arndt

This totally works, thanks

For reference, I'll add the plain Basic V2 code here

Quote from SkulleateR

Quote from Goodwell

In some thread I found the information that POKE 0,65 puts the C64-Mode to 40 MHz.

Is there a way to get back to 1Mhz ?

POKE 0,64