LAB1X sample code not working with 25LC640.

[EarlyBird2]

The difference is that SI and SO pins are tied together in 2nd code, via 1k resistor.

From the first code

' Subroutine to write data at addr in serial EEPROM
eewrite:
CS = 0 ' Enable serial EEPROM
Shiftout SI, SCK, MSBFIRST, [$06] ' Send write enable command
CS = 1 ' Disable to execute command
CS = 0 ' Enable
Shiftout SI, SCK, MSBFIRST, [$02, addr.byte1, addr.byte0, B0] ' Send address and data
CS = 1 ' Disable
Return

You are shifting out on the data in pin? Which is the same in the original SPIX.htm so I guess I am confused.