PUSHEM

PUSHEM is macro assembler for the BytePusher machine. It works exclusively in hex. There are some primitives, and then you can also define macros for other uses.

Tables

PUSHEM works by creating tables to do calculations with. There are two kind of tables, small tables (256 bytes) and big tables (64K bytes).

Here is an example of creating a big table for adding numbers:

\T __MAJOR #1 __MINOR

Macros

You can create macros which can expand into larger pieces of codes.

Here is an example to make a label name at the current point in the program:

{ Label (name)
  \c ^1 ?
}

Instructions

An instruction can store a source address, destination address, and jump address. By default, the jump address is the address of the next instruction.

To make a move instruction:

\x #0006C0 #00004F

To jump:

\j +#000100

You can combine multiple moves for indirect moves and stuff:

\x Counter x&Next
\c Next ?
\x Table1 Counter

Examples

• "Munching Squares" program

External resources

• http://zzo38computer.org/prog/BytePusher/

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