** updated sep 07, 2002 (R8 had wrong value)

The IEC-ATA hardware is made with the following parts:

Connectors:
-----------

CN1: 4 pin power connector, same as found on ATA drives
CN2: 6 pin connectors for IEC serial bus
CN3: Identical to CN2 (to allow chaining of IEC devices)
CN4: 40 pin IDE connector
CN5: 6 pin ISP connector

ICs:
----

U1: 74573     8-bit D-latch
U2: 7406      open collector inverters
U3: AVR 8515  microcontroller
U4: IDT71256  32k 8-bit SRAM

Resistors:
----------

R1:  1k ohm
R2:  1k ohm
R3:  1k ohm
R4:  1k ohm
R5:  1k ohm
R6:  4.7k ohm
R7:  4.7k ohm
R8:  47 ohm
R9:  470 ohm
R10: 470 ohm

Capacitors:
-----------

C1: 10uF
C2: 0.1uF
C3: 0.1uF
C4: 0.1uF
C5: 0.1uF
C6: 0.1uF
C7: 22pF
C8: 22pF

Other:
------

L1: Ferrite bead
L2: Ferrite bead
L3: Ferrite bead
L4: Ferrite bead

X1: 4.0MHz crystal

D1: Error LED
D2: Drive activity LED

J1: Reset
J2: Jumper for setting the serial bus protocol timing 
    (unconnected: C64, connected: VIC-20) 

