Addressing ModesRegister : Data is contained in given register.
: mov a, b ; A=B
Immediate : Data if given in the word following the op. cod (operand).
: movi a, data ; A=data
Direct : Data is in the memory location which address is given in the word following the op. cod. (operand).
: ld a, addr ; A=[addr]
Indirect : Data is in the memory location which address is contained in a register used as a pointer.
: ldx a, d ; A=[D]
Relative : (Branch only). Jump to OFF_SET relative to current instruction address. The OFF_SET if given as an operand.
: jnzr OFF_SET ; PC=PC+OFF_SET
Relative Indirect: (Branch only). The OFF_SET is the content of given register.
: jnzrx d ; PC=PC+d
Stack : Data comes from the Stack which is always pointed by register SP.
: pop a ; A=[SP]; SP=SP-1
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Homebuilt CPUs WebRing
JavaScript by Qirien Dhaela
Join the ring?
David Brooks, the designer of the Simplex-III homebrew computer, has founded the Homebuilt CPUs Web Ring. To join, drop David a line, mentioning your page's URL. He will then add it to the list.
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Project start date: May 13 of 2009
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