I've done some searching on the web:
The JUN/JMS instructions store addresses high-middle-low.
Also, the FIM instruction which picks up a byte from program memory (addressed as bytes) and puts the high nibble in the lower register (R0 for example) and the low nibble (R1 for example).
Is there agreement that the 4004 is big-endian?
Which endian was the Intel 4004?
The Intel 4004 had 4-bit buses and data words, but the program counter and code address space was 12 bits. Was the 4004 little endian (like all of Intel's later microprocessors and microcontroller...
retrocomputing.stackexchange.com
The JUN/JMS instructions store addresses high-middle-low.
Also, the FIM instruction which picks up a byte from program memory (addressed as bytes) and puts the high nibble in the lower register (R0 for example) and the low nibble (R1 for example).
Is there agreement that the 4004 is big-endian?