4 Wire SPI with Shiftin/Shiftout ?

[richard]

And I don't get, what's wrong with $100 ?

how big is the biggest number that can be represented in a byte ?

Shiftout TC, SCLK, 5, [$03,$100,$00,$0] ' Send write command, set start offset

an attempt to read from address 0x1000000 a non valid 25 bit address, except that shiftout will send address of 0x00 since the 8 bit default not over written

maybe [3,1,0,0] or [3,100,0,0] or [3\8,$100\16,0\8] or [3,$100\16,0]