Split640 or Split512 Determines how much RAM is left over for 'Rom2RAM' and 'Split Memory Block' (SMB) and also how much 'conventional' memory is available. Some memory cards can 'backfill' the 'conventional' memory area, so Split512 doesn't *absolutely* mean that there is only 512KB of 'conventional' RAM. Not a brilliant idea to do it that way though.

Example:

Split640	Rom2RAM in an 8MB machine gives:
000000-09FFFF	1st 640K of 1st MB
0A0000-0E0000	VGA MGA CGA and adapter space
0E0000-0FFFFF	'Shadowed' system BIOS in 1st 128K of 'SMB'
100000-7FFFFF	2nd through 8th MB of memory
800000-83FFFF	last 256K of 'SMB' (may be 'lost' if >16MB in m/c)

SlotType[n] = x y z

[n]	1 to NumSlots	Number of slot
x	32/24	32 or 16-bit slot addressability
y	0/1	Video extension slot no or yes
z	0/1	Matched memory extension (?) no/yes

DisketteDrive[n] = list
n = Number of 'drive select' signals on cable minus 1.
   (don't you wish they'd be consistent?)
list

0	not installed
1	360K / 5.25"
2	1.2M / 5.25"
3	720K / 3.5"
4	1.44M / 3.5"
6	2.88M / 3.5"
8	reserved or tape

Thanks to Peter for the following section-
   5 was -originally- intended to be used with 2.88MB / 3.5" with 36 sectors á 512 bytes and 1 mbps/s data rate. The IBM 2.88MB uses 18 sectors á 1.024 bytes at 1mbps data rate ... 
   Also not implemented but theoretically possible is the 2.4MB / 5.25" format as used for IBM minis and control-units. Didn't made it due to the better handling of 3.5" disks.
   The 9595 shows 1,2,4,6 in the planar-list ... and this is what "Set
configuration" shows, when you cruise through the settings for FDD(1) and (2) - plus "0" for "Not Installed". FDD(0) knows only 0,4,6 ... !
 

N.B. I have changed this for 5.25" drive support on my Mod. 80 (i.e. added '1' to Drive[1] list) before now. Also, you can figure this out by looking at what is listed in 'Change Config' as you press F5/F6 repeatedly