>Do you not mean The QDOS/SMS Technical Guide...
No, I found it first in the ST guide Jochen Merz sent me some time ago, that's why the information was incomplete I guess. It's also shorted and the QDOS tech guide has no index! >Yes I read the manual and found the system variable, SYS_IFPU which returns >4 for a FPU <snip> >But there is no builtin function to find the base of the System Variables, I >use PDTK which I think you will agree is very good. For those who don't know what this is, the PDTK is a PD Toolkit, by Mark Swift. It is included with QDOS Classic and I think the original Amiga Emulator too. It is also available from the Mark Swift web pages. I see that Marcel has sent a list of current values for this system variable. Probably as good a way as any of finding the system variables across platforms in order to check this system variable seems to be: t$ = VER$ sv = 163840 : REMark fixed address on old QL IF t$ = 'JSL1' OR t$ = 'HBA' THEN sv = VER$(-2) : REMark on Minerva or SBASIC END IF but this does not of course work on some of the emulators which can move system variables but does not support VER$(-2) There are of course plenty of free extensions for BASIC programmers who want to access this on all platforms, e.g. the DIY Toolkit SYSVARS extension. Marcel: is it OK for me to use your list to document this via QL Toady? -- Dilwyn Jones [EMAIL PROTECTED] http://www.soft.net.uk/dj/index.html