XT-IDE Rev 3
This is the third revision of the XT-IDE card produced by the Vintage Computer Forums (VCF), not the first nor second revisions.
Photo / Identification
A photo of an XT-IDE Rev 3 card is here.
Printed on the card is "XT-IDE rev 03".
MAY/JUN2016: Printed Circuit Board (PCB) developed by glitch.
• The development thread is here.
• Project files are at here.
Changes from Rev 2
• Different switch/jumper settings.
• Although IDE operating mode ('Compatibility'/'Hi-speed') is retained, the jumper settings for it are opposite to those on Rev 2.
• Removed: Optional serial port.
• Removed: Optional Molex power connector.
Hi-Speed mode versus Compatibility mode
Just like with the XT-IDE Rev 2 card, it is expected (only for performance reasons) that the Rev 3 card be jumpered for hi-speed mode, and using a 2.x.x version of the XTIDE Universal BIOS (per option #1 in the table below).
Compatiblity mode changes the IDE interface to how it is on an XT-IDE Rev 1 card. You will need to jumper your Rev 3 card for this mode if you choose to use a 1.x.x version of the XTIDE Universal BIOS.
The three options for the Rev 3 card are show in the following table:
Some technical information on this subject is at here.
A diagram for the IDE functionality is at here
A diagram for the ROM functionality is at here
If you change the base I/O address of the IDE interface, then you will need to reconfigure the associated option of the XTIDE Universal BIOS within the EEPROM (so that the BIOS knows which I/O addresses to use).
Circuit diagram (PDF version of KiCad file 'XT-IDE.sch') (diagram dated 14MAY2016)