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XT-CF-Lite V4

Description

XT-CF-Lite V4 is a remake of James Pearce's XT-CF-Lite card, which in its turn is a simplified version of his CPLD based XT-CF card, and shares some ideas with XT-IDE card. This card allows connecting a Compact Flash (CF) card to computers with ISA bus and using it as a mass storage device. The card also supports BIOS extension ROM.
The main difference from the original XF-CF-Lite is using through hole components except of CF connector. Other differences are:
  • 8 KiB EEPROM (28C64) or 8 KiB EPROM (27C64) instead of a flash ROM.
  • Slightly different activity LED circuit (saves one IC).

Picture


DIP Switches Settings

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

 SW2.1 EEPROM Enable
 OFF EEPROM disabled
 ON EEPROM enabled

SW2.2 - EEPROM Write Enable

 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

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

SW2.8 - Not used

Bill of Materials (BOM)

 Component Type
 Reference
 Description Quantity Possible Sources and Notes
 PCB  XT-CF-Lite V4 PCB
 1 Order from Sergey or make your own
 Capacitor
 C1 - C6 0.1 uF ceramic, 5.08 mm lead spacing  6 Mouser 810-FK28X7R1H104K
 Capacitor C7 - C8
 10 uF ceramic, 5.08 mm lead spacing  2
 Mouser 810-FK24X5R1C106K
 Note: Can be replaced with tantalum or electrolytic capacitors
 LED D1 3 mm (T-1) LED indicator
 1 Mouser 604-WP3A8GD
 Connector P1 Compact Flash Card connector
 1 Mouser 517-N7E50-Q516RB-40
 Connector P2 2x1 pin header  1 Mouser 649-78229-102HLF
 Resistor R1 330 Ohm, 1/4 W 1 Mouser 291-330-RC
 Resistor R2 470 Ohm, 1/4 W
 1 Mouser 291-470-RC
 Resistor R3 1 kOhm, 1/4 W
 1 Mouser 291-1K-RC
 Resistor R4 5.6 kOhm, 1/4 W
 1 Mouser 291-5.6K-RC
 Resistor R5 10 kOhm, 1/4 W
 0 Note: Do not install
 Resistor Array
 RR1
 10 kOhm, 6 pin, bussed resistor array 1 Mouser 264-10K-RC
 Resistor Array
 RR2 10 kOhm, 10 pin, bussed resistor array 1 Mouser 266-10K-RC
 Switch
 SW1 4 positions DIP switch  1 Mouser 506-54356402
 Switch SW2 8 positions DIP switch  1 Mouser 571-54356405
 IC U1 28C64 EEPROM or 27C64 UV erasable EPROM 1 Mouser 556-AT28C64B15PU
 Note: Atmel AT28C64B is the recommended part
 IC
 U2, U3
 74LS688 magnitude comparator 2 Mouser 595-CD74HCT688E, 771-74HCT688N, 595-SN74LS688N, 595-SN74LS688NE4
 IC U4 74LS32 quad 2-input OR gate
 1 Mouser 595-SN74ALS32N, 512-DM74ALS32N, 595-SN74AHCT32N
 IC U5 74LS04 hex inverters
 1 Mouser 595-SN74ALS04BNE4, 595-SN74ALS04BN, 595-SN74AHCT04NE4
 IC Socket
 U1 28 pin 600 mil (wide) DIP socket  1 Mouser 517-4828-6000-CP
 Note: U4 socket is only required for BIOS extension ROM function
 IC Socket
 U2, U3
 20 pin 300 mil (narrow) DIP socket 2 Mouser 517-4820-3000-CP
 IC Socket
 U4, U5
 14 pin 300 mil DIP socket 2 Mouser 517-4814-3000-CP
 Bracket  ISA card bracket - Keystone 9202 1 Mouser 534-9202
 Screw  Screw, 4-40 thread, 1/4" length 2 Mouser 534-9900


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Sergey Kiselev,
Apr 25, 2013, 12:04 PM
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Sergey Kiselev,
Apr 25, 2013, 12:04 PM
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Sergey Kiselev,
Apr 25, 2013, 12:04 PM
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Sergey Kiselev,
Apr 25, 2013, 12:04 PM
ą
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