SIZE instruction on HP41CX

[Sylvain Cote]

The SIZE function specify the number of data registers and is part of all HP-41 core functions.

If you XEQ "SIZE" , then specify 005 at the SIZE _ _ _ prompt, 5 data registers will be allocated from the main memory.
Data registers 00, 01, 02, 03 & 04 will then be available.

The "SIZE?" function return the number of data registers allocated and is part of the X-Functions/Memory module.

If you XEQ "SIZE?" the number of data registers currently allocated is placed in X. (in this example the number returned will 5)

The HP-41C contains ...

• ROM: the core functions in page 0, 1 & 2
• RAM: 64 Registers or 448 bytes of main memory
  

The HP-41CV contains ...

• ROM: the core functions in page 0, 1 & 2
• RAM: 320 Registers or 2240 bytes of main memory
  

The HP-41CX contains ...

• ROM: the core functions in page 0, 1 & 2
• ROM: the X-Functions/Memory module in page 3
• ROM: the Time module in page 5 bank 0
• ROM: the CX-Functions module in page 5 bank 1
• RAM: 320 Registers or 2240 bytes of main memory
• RAM: 124 Registers or 868 bytes of extended memory