On MSX tR changeing CPU expetially on BASIC is usually hard. Either you have to write complex BASIC programs or you need to load some sort of BASIC extension to get needed functionality. Now there is finally one command solution called EasyCPU!

Here is how you can use this program...

BASIC:

BLOAD"EASYCPU.COM",R,<CPUMODE>

DOS:

EASYCPU <CPUMODE>

<CPUMODE>:
0 = Z80
1 = R800 ROM
2 = R800 DRAM

As I'm lazy I release this software as source. Feel free to use it where ever you need it.

~NYYRIKKI

        OUTPUT EASYCPU.COM

	CP 0
	ADD A,THEEND
	ADD A,1
	ADD A,0

	ORG 1

	LD HL,#2D
	LD A,#80
	CALL #C
	EX AF,AF'
	DEC SP
	LD DE,#309
	DEC SP
	POP HL
	LD A,L
	SUB E
	LD C,A
	LD B,H
	DEC H
	JR NZ,SKIP
	LD A,(#82)
	XOR #30
SKIP:
	EX AF,AF'
	CP D
	JR NZ,NOTR
	EX AF,AF'
	CP D
	JR NC,ICPU
	OR #80
	DW #80F7,384
	RET
NOTR:
	LD HL,NOTRTXT
	JR PRINT
ICPU:
	LD HL,ICPUTXT
PRINT:
	ADD HL,BC
	EX DE,HL
	LD C,L
	JP #F37D

NOTRTXT:
	DEFB "This program is for MSX tR only.",#D,#A,"$"
ICPUTXT:
	DEFB "Illegal CPU mode.",#D,#A,"$"
THEEND:

what's with the BASIC man?
There's already a DOS prop to switch CPU...

Nice solution tho. thanx.

@ro: Trust the force man! It will work on BASIC as well...

Another nice one in the category "NYYRIKKI gems"...

Quote:

As I'm lazy I release this software as source. Feel free to use it where ever you need it.

Oh, so this is absolute 100% pure opensource xD

[nitpicking]
I'm not sure whether what NYYRIKKI is the preferred form for making changes to, if it is not it does not really qualify as open source.
[/nitpicking]

It seems that these questions pop up even when answer has no practical value to anyone. I think I have to learn to be more accurate. Ok, here we go: Take it, use it on your projects, modify it, change the name, claim that you made it. I don't care. Credits are always nice but not required. Clear?

The actual point I was trying to make was -> "Look, I got nice idea" and "Here you can see assembler and BASIC environment abused and used all wrong (again)"

I have made a binary version of EasyCPU available on The MSX Plaza for people who are too lazy to compile it themselves

Quote:

[nitpicking] I'm not sure whether what NYYRIKKI is the preferred form for making changes to, if it is not it does not really qualify as open source. [/nitpicking]

I'm not sure whether I actually understand the above sentence...