6502 Machine Code For Humans by Alan Tootill, David Barrow

By Alan Tootill, David Barrow

Desktop code is the language of the processor on the center of your computing device process. in contrast to many different books on laptop code, this ebook doesn't systematically clarify the operation of every guide in over the top aspect. as an alternative, it provides you with basic, comprehensible initiatives in computing which are performed by way of teams of directions (routines). each one activity is defined, the tactic defined, and enough documentation given so you might paintings throughout the workouts and spot the half performed by means of each one guideline.

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Stack - 3. Input - A = the number of the word to be read. X = the address of the first page zero byte it is to be read into. Output - Page zero locations X-X+I hold the value of the word read from store. Registers changed - None. Method· The word to be read is at the word storage base address plus double the word number. The word number is therefore doubled, by shifting it left one bit, so that it can be used to index the word storage base address. In word numbers of 128 or more, the left shift will lose into the carry the most significant bit, with a value of 128 that needs to be doubled to 256.

Just store it in the right screen address. This chapter is about keeping track of the right screen address without having to bring to mind the actual address of each character displayed. The display area being worked in, which can be the whole or any rectangular part of the screen, has been defined by display area parameters brought into the current display area. When parameters are brought into the current display area, display area information is set to zero for the next screen action to operate at the home address.

The routine we will consider below can be used to clear the screen but, because it takes account of the information in the current display area, will fill with the character in page zero location PCH, the screen area defined either to the right or left, up or down from the home address, with the possibility of skipping columns and or rows. FILL - Fill the display area with the character in page zero PCH Subroutines - PSHZM, PARAM, STTMP, TFRZZ, ADCZZ, LDTMP. Length - 57. Stack - 7. User Stack - 9.

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