This web site is not some kind of 'official' documentation hub for the XT-IDE card.
It is simply the result of someone who decided to add to the documentation that exists elsewhere.
VCF XT-IDE - The History of Hi-Speed Mode (a.k.a. the 'Chuck mod')
Feb 2011
Early in the life of the XT-IDE card (still at revision 'Rev 1'), Chuck(G) of the Vintage Computer Forums proposed a change to improve performance.
The change had both hardware and software components:
Hardware: Swap the A0 and A3 address lines going to the IDE device. See here. Software: Alter the XT-IDE card's BIOS to compensate for the address line swap.
At the time, this change was commonly referred to as the 'Chuck mod'.
Some people modified their 'XT-IDE Rev 1' card, plus made the appropriate hack to the BIOS on the XT-IDE card. At the time (2011), the BIOS that was hacked would have either been the 'Hargle BIOS' (predates the XUB), or a v1.x.x version of the XUB.
Feb/Mar 2012
Hacking of hardware and software no longer required.
New hardware
'Rev 2' revision of the XT-IDE card released. Incorporates the 'Chuck mod', later called 'hi-speed' mode. In fact, there is a set of jumpers that allow the user the choice of running the card in hi-speed mode, or running in 'compatibility' mode (compatible with the XT-IDE Rev 1 card).
New software
Version '2.0.0 beta 1' of the XTIDE Universal BIOS (a.k.a. XUB) released. Via the 'controller type' configuration option, it caters for both the Rev 1 and Rev 2 cards:
* For Rev 1 cards, the controller type in the XUB is set to '8-bit dual port (XTIDE)'
* For Rev 2 cards jumpered for compatibility mode, the controller type in the XUB is set to '8-bit dual port (XTIDE)'
* For Rev 2 cards jumpered for hi-speed mode, the controller type in the XUB is set to 'XTIDE mod (A0<->A3)'
Sep 2012
Version '2.0.0 beta 2' of the XTIDE Universal BIOS (a.k.a. XUB) released.
In beta 2, the controller types were renamed:
* For Rev 1 cards, the controller type in the XUB is set to 'XTIDE rev 1'
* For Rev 2 cards jumpered for compatibility mode, the controller type in the XUB is set to 'XTIDE rev 1'
* For Rev 2 cards jumpered for hi-speed mode, the controller type in the XUB is set to 'XTIDE rev 2 or modded rev 1'
XT-IDE Derivations
Over the intervening years, there have been many derivations/variations of the XT-IDE card (see here).
The vast majority of those do not have a set of hi-speed/compatibility jumpers. That is because those cards are hardwired to hi-speed mode. You set the controller type in the XUB to match your card (e.g. set 'XT-CF PIO8'), and the XUB knows from that, that the card operates in hi-speed mode.