Difference between revisions of "XT-CF-Lite V4"

Revision as of 10:08, 9 October 2021

This is a place holder page for the XT-CF-Lite V4 card.

Assembly

If purchasing the non-fully assembled version then you will need to solder on a surface mount style CF connector. Solder paste has flux mixed in and over time it degrades. To ensure a good quality solder job please use paste that is fairly new (< few months old) else solder will form bridges.

Solder on the connector first. Once its soldered on check for shorts before proceeding with installing the rest of the components

DIP Switch Settings

Make sure to disable IDE controllers in your motherboard BIOS if using this card with motherboards with built in IDE controller.

If using this with the Floppy controller ensure the address of the floppy controller is higher than this cards address.

SW1 - I/O Address Selection
 SW1.1	 SW1.2	 SW1.3	 I/O Address
 ON	 ON	 ON	 0x300
 ON	 ON	 OFF	 0x320
 ON	 OFF	 ON	 0x340
 ON	 OFF	 OFF	 0x360
 OFF	 ON	 ON	 0x380
 OFF	 ON	 OFF	 0x3A0
 OFF	 OFF	 ON	 0x3C0
 OFF	 OFF	 OFF	 0x3E0

SW1.4 - Not Used
SW2.1 - EEPROM Enable
 OFF	 EEPROM disabled
 ON	 EEPROM enabled
SW2.2 - EEPROM Write Enable
 OFF	 EEPROM write disabled
 ON	 EEPROM write enabled

SW2.3 - SW2.7 - EEPROM Address Selection

 SW2.3	 SW2.4	 SW2.5	 SW2.6	 SW2.7	 EEPROM Address
 ON	 ON	 ON	 ON	 ON	 0xC0000
 ON	 ON	 ON	 ON	 OFF	 0xC2000
 ON	 ON	 ON	 OFF	 ON	 0xC4000
 ON	 ON	 ON	 OFF	 OFF	 0xC6000
 ON	 ON	 OFF	 ON	 ON	 0xC8000
 ON	 ON	 OFF	 ON	 OFF	 0xCA000
 ON	 ON	 OFF	 OFF	 ON	 0xCC000
 ON	 ON	 OFF	 OFF	 OFF	 0xCE000
 ON	 OFF	 ON	 ON	 ON	 0xD0000
 ON	 OFF	 ON	 ON	 OFF	 0xD2000
 ON	 OFF	 ON	 OFF	 ON	 0xD4000
 ON	 OFF	 ON	 OFF	 OFF	 0xD6000
 ON	 OFF	 OFF	 ON	 ON	 0xD8000
 ON	 OFF	 OFF	 ON	 OFF	 0xDA000
 ON	 OFF	 OFF	 OFF	 ON	 0xDC000
 ON	 OFF	 OFF	 OFF	 OFF	 0xDE000
 OFF	 ON	 ON	 ON	 ON	 0xE0000
 OFF	 ON	 ON	 ON	 OFF	 0xE2000
 OFF	 ON	 ON	 OFF	 ON	 0xE4000
 OFF	 ON	 ON	 OFF	 OFF	 0xE6000
 OFF	 ON	 OFF	 ON	 ON	 0xE8000
 OFF	 ON	 OFF	 ON	 OFF	 0xEA000
 OFF	 ON	 OFF	 OFF	 ON	 0xEC000
 OFF	 ON	 OFF	 OFF	 OFF	 0xEE000
 OFF	 OFF	 ON	 ON	 ON	 0xF0000
 OFF	 OFF	 ON	 ON	 OFF	 0xF2000
 OFF	 OFF	 ON	 OFF	 ON	 0xF4000

Additional Notes

Make sure that selected I/O and EEPROM addresses do not conflict with other devices
Addresses 0xC0000 - 0xC6000 will conflict with EGA/VGA BIOS extension
Addresses 0xC8000 - 0xCA000 might conflict with XT Hard Disk BIOS extension
Addresses 0xE0000 and up might conflict with system BIOS on newer motherboards
It is recommended to disable EEPROM write once XT IDE BIOS extension is programmed and configured

Boot Screen

Boot Screen should look like this: -=XTIDE Universal BIOS (XT)=- @ Cxxxh If not seen on boot, then there is an address conflict.

First Time Use

It is recommended to boot the computer and install DOS 6.22. This will format your drive and install the DOS system which has tools you can use to manage your system. The DOS will install however you will still have problems booting since DOS does not issue the fdisk /mbr you have to do this manually.

Once you are booting from the CF card you can run fdisk again to create an extended partition and create a drive D:

Format drive D in order to use the second half of the 4GB CF card by issuing the "format /s d:" command.

Tips

This board has a CF card adapter component which requires SMD soldering. Solder this on first. Its important to not use expired solder paste. If its older than 2 months throw it out. Solder paste has flux in it and if its old the flux looses its capability resulting in solder bridging.
Make absolutely sure that there is no solder bridging on the CF card adapter. Check with a multi-meter for shorts.
4GB card is the maximum recommended card for this adapter. It offers the maximum space allowed on the FAT16 (2GB) and IDE standard (2 Drives) however DOS takes a long time calculating the available space. You can still purchase the 4GB card and partition it in Linux to a smaller value depending on the actual space you need.

Quality Check

Depending on your skill level, soldering on the connector is the most challenging part of the build. It should be the first thing you solder and test.

Testing the solder connections on the CF-50 connector is tedious but critical at this point. A bad solder joint can at best cause your card not to work and at worst fry your computer.

You will need a multi-meter with an audible connectivity test function. If the test fails you can use a solder wick to fix the bridges or if that doesn't work then use a hot air gun to de-solder and start over. Just don't get 2nd degree burns while doing it. Don't ask!

If all else fails I have standalone PCBs and CF-50 connectors for very low cost in my eBay store if you are just looking to start fresh.

Procedure

Check for short across the C8 capacitor.
Test the letters. There should be NO connectivity between the points listed with letters. If there is connectivity then there is a solder bridge on the 2 pins that share the letter. Use a solder wick to fix this situation.
Next we test connectivity starting from pin 1 working your way up to 50. Some pins are not connected (NC) so you can skip over those example 24-31. Very gently touch the pin of the connector with one end of the probe and the other probe to the numbered point on the board. Point 34, 35 are VIAs and not pins. They may be painted over so look out for that.

Use the following image to quality check the soldering job. Click on the image then next page click again to enlarge.

Address settings

My personal experience its best to initially setup your card with the following DIP Switch settings. If you choose to use this with a floppy controller it will allow you to have the floppy controller at ROM address 0x8000 which is lower than this controller's address. If you are using the Xi8088 Processor board then make sure SW2.2 is OFF otherwise it will conflict with this card.

IO Base Address: 0x300 this means SW1.1-4 All ON

SW2.1-2 = 11

ROM Address: 0xCA000 SW2.3-7: 11010

Check the back of the card for different address settings if the above doesn't suit you needs.

Boot up

Pentium 3 system with AWARD BIOS

During the bootup if your card doesn't have any conflicts then you will see the XT-IDE menu. This will allow you to enter commands to control how your system boots.

Type: "A A" to boot from the A drive. This will be required if you want to install DOS for the first time from the A drive. Once DOS is installed you *MAY* need to again boot from the A: drive and issue the fdisk /mbr command to install the MBR to the C drive as the DOS 6.22 setup does not do this by default.

Post build

It is recommended to boot the computer and install DOS 6.22. This will format your drive and install the DOS system which has tools you can use to manage your system.
Once you are booting from the CF card you can run fdisk again to create a extended partition and create a drive D:
Format drive D in order to use the second half of the 4GB CF card by issuing the "format /s d:" command.

Troubleshooting

Hard drive does not boot - try fdisk /mbr
Cannot load COMMAND, system halted - Make sure that there is a line in AUTOEXEC.BAT that reads "COMSPEC=X:\PATH" where "X:\PATH" is wherever COMMAND.COM resides. Edit the PATH command in your AUTOEXEC.BAT file, if you are trying to run a command in another directory that should be accessible from anywhere.
System gets very unstable and/or the data on the Compact Flash drive gets corrupted. There may be many reasons for this. During my testing I noticed that the card is very prone to noise on the bus. Please ensure that card is located as close as possible to the processor board. Other reason is that the Compact Flash card may not be fully compatible with the board. Replace the CF card with another one and try again.