Many fixes and improvements to the BIOS Extension ROM. (#33)

* Revert "Uploaded_2_9_2025"

This reverts commit ec79bbdbc9.

* Fixing DEBUG_IO builds.

* Make the IO port base a define.

* Fix CPU test to properly handle 808x vs V20.

* Improve timeout management logic.

* Improve SD Card initialization logic.

* Implement INT18h bootstrapping.

* Implementing a different test for processor type.

* Allow use with another fixed drive (eg: ESDI drive).

* Allow swapping driver ID between the BIOS disk and XTMax.

* Fix address of the ROM segment.

* Fixing missing STI at the top of the handler.

* Major rework of IO to use MOVSW.

* More code reorg and auto-detecting second drive.

* Update XTSD to use MOVSW.

* Add diagnostics program.

* Workaround for MS-DOS strange handling of interrupts.

* Use a lookup table for the memory map.

* Make the BootROM relocatable.

* Some more refactor of the Teensy code.

XTMax/Drivers/SDPP/DRIVER.C

@@ -365,14 +365,8 @@ PUBLIC void Initialize (rh_init_t far *rh)
   WORD brkadr, reboot[2];  int status, i;
 
   /* The version number is sneakily stored in the device header! */
-  cdprintf("SD Card driver V%c.%c for XTMax (%s)\n     based on SD pport device driver (C) 2014 by Dan Marks\n     based on TU58 by Robert Armstrong\n",
-    header.name[6], header.name[7],
-#ifdef USE186
-    "80186+"
-#else
-    "8086"
-#endif
-    );
+  cdprintf("SD Card driver V%c.%c for XTMax\n     based on SD pport device driver (C) 2014 by Dan Marks\n     based on TU58 by Robert Armstrong\n",
+    header.name[6], header.name[7]);
 
   /* Parse the options from the CONFIG.SYS file, if any... */
   if (!parse_options((char far *) rh->bpbtbl)) {