Posted By
MMS
on 2017-08-20
14:58:25
 |  Re: How to identify platform in BASIC (Plus/4, C64, C128, maybe VIC20)
Hi!
Thank you for the hints! I also think first about the Kernal, but I remember, that in Plus/4 from BASIC you always read the RAM,and NOT the ROM (even with PEEKs). I suppose the C128 is the same.
On the other hand, this hint gave me the idea: it is not the case when you check a C64, above $E000 I can see from BASIC some (kernal) ROMs with fixed value, I can check the values on the net.
(I am not sure about VIC-20, but it has rather low resolutions and other limitations, so I may skip that platform.)
-So if I write anything with POKE above $A000, and it is not the same, when I PEEK it, it should be C64.
-Next step: if I PEEK (215) on C128:
PEEK(215) - 0 = 40 column mode / 128 = 80 column mode, so probably not allow to change it.
On Plus/4 it is unused as per SVS map, or by Speech modul (so unused). Probably I can write and re-read it.
So if I write 64 to address 215, after then the PEEK(215) will show 64 if it is Plus/4, and 0 or 128, if C128.
Thanks!
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