Retro & Vintage Computers and Appliances

Building an XTIDE ISA IDE Card for use with a Compact Flash Adaptor

Componenet List

Note there may be ommissions or other issues with this list as it's been edited from the official bill of materials. Please check against the schematic, PCB and original.

Ref(s)      Value
U9          AT28C256
U1, U2      74F573
U3, U11     74LS245
U4, U6      74LS04
U5          74LS32
U7          74LS138
U8, U10     74LS688
SW1, SW2    8 way DIP switch
RP1, RP2    10K x 9 SIP resistor packs
R1, R2      470R 1/4 Watt 5% resistor
R3, R4      10K 1/4 Watt 5% resistor
D1          LED	(whatever colour you prefer)
J3, J4      2x1 header
J5          5x2 header
J1, J2      3x1 header
C1-C11      0.1 uF 50V axial capacitors
C12         100 uF 6.3V capacitors
1x 28 pin wide IC socket for EEPROM
6x 20 pin DIL IC socket
3x 14 pin DIL IC socket
1x 16 pin DIL IC socket
J1-J5 Order a 20 pin (or greater) breakaway header and break into the required lengths.
Jumper shunts 0.1" jumper links, 2 or 3 required
20x2 pin right angle connector (for IDE interface)
Bracket	    Keystone 9202 ISA bracket
Screws      4-40 x 1/4" machine screw for bracket

Note: Interrupt features are not currently used so no IRQ jumpers are needed for these at present.

All 7400 series logic ICs can be substituted for LS, ALS, ACT, or HCT equivalents.

RP1, RP2, R3, and R4 are pull-up/pull-down resistors, their values are noncritical. Anything from 2.2K - 47K should be fine. R1, R2 tolerance is not critical, but using a substantially different value will alter LED brightness. Do not use less than 220R. C1 - C11 are power supply bypass, 0.01 - 0.1 uF axial or radial ceramic capacitors are fine. C11 is for power supply decoupling, any value from 47 uF up is fine, aluminum electrolytic or tantalum.

SW1, SW2 are just 8 position DIP switches, use whatever is cheap/convenient. D1 is just an indicator, use whatever you'd like