williams-et-al-1983-apple-ii-computer-graphics

CHAPTER 3-SYSTEM MONITOR-MEMORY TRICKS 15q .ClF< CR>Do not use spaces to separate the two elements of the command. Thecomputer will then display something similar to:c- xx xx xx xx xx xx xx xxC8- xx xx xx xx xx xx xx xxCl- xx xx xx xx xx xx xx xxC18- xx xx xx xx xx xx xx xxThe numbers in the left hand column index the memory locations displayedin the first column of each line. Each of the xx's will be somehexadecimal byte, though the precise value of each byte will vary. Shownin the fi rst row will be the contents of memory locations CThe colon is the Monitor command to change the values of memorystarting at the given location (C), and the FF's are the values to whichyou wish to change. The spaces between each of the bytes are necessaryfor the command to execute properly. (From here on out, we will assumethat you will press the return key when required, so we will stop putting after each entry.)To verify that the memory has been changed, enter:C . C7and this time you will see:C- FF FF FF FF FF FF FF FFThis indicates that the eight bytes beginning at C