Add docs for VPEEK function

appendix/basic_commands.tex

@@ -2848,14 +2848,14 @@ \subsection{VPOKE}
 
 \codeblock{
 
-	10 FOR I=1 to 256*64 STEP 2\\
+	10 FOR I=1 TO 256*64 STEP 2\\
 	20 VPOKE 1,\$B000+I,0 :REM SET COLOR\\
 	30 NEXT I\\
 
 }
 
-The above BASIC code will fill the screen with black spaces one character at a
-time by writing directly to the area of the VERA's VRAM where the X16 stores
+The above BASIC program will fill the screen with black spaces one character at
+a time by writing directly to the area of the VERA's VRAM where the X16 stores
 the text mode screen data.  The {\ttfamily VPOKE} sets the background and
 forground color to black, although the character data does not change.\\
 
@@ -3665,5 +3665,19 @@ \subsection{VAL}
 
 \subsection{VPEEK}
 
-<TODO>
+The {\ttfamily VPEEK} function gets a single byte of vidoe RAM (VRAM) from the
+VERA's onboard memory.  The allows a BASIC program to read the data being
+interpreted by the VERA to produce graphics and sound.  The {\ttfamily VPEEK}
+function takes two arguments: the bank and the memory location within the bank.\\
 
+Example:\\
+
+\codeblock {
+	10 FOR I=0 TO 256*64-1\\
+	20 PRINT VPEEK(1,\$B000+I),;\\
+	30 NEXT I\\
+}
+
+The above BASIC program will print out the data being used to display the text
+mode screen data, including the attribute data responsible for coloring the
+text.\\