Timer counters now 64-bit;

Cleaned up floppy code a lot and reverted to single poller;
Fixed segment present bit and limit checking at read/write within segment;
The ASUS boards now have memregs too;
RTC code improved based on suggestion by Sarah Walker;
Fixed SVGA odd/even emulation and added chain odd/even support;
Removed non-existent CPU's.

src/vid_mda.c

@@ -18,7 +18,7 @@ typedef struct mda_t
         uint8_t ctrl, stat;
         
         int dispontime, dispofftime;
-        int vidtime;
+        int64_t vidtime;
         
         int firstline, lastline;