Updated User Manual Command Reference (markdown)

User-Manual---Command-Reference.md

@@ -15,6 +15,7 @@
 * [rdm (rd)](#rdm-rd)
 * [regs (r)](#regs-r)
 * [reset (res)](#reset-res)
+* [special (sp)](#special-sp)
 * [srec (sr)](#srec-sr)
 * [step (s)](#step-s)
 * [test (t)](#test-t)
@@ -308,7 +309,9 @@ FFF0 F4 FF A9 0D 6C 08 02 6C 06 02 C7 FF 3F FF B2 FF  ....l..l....?...
 
 Reads a single host memory address.
 
-_Usage: rd \<address\>_
+_Usage: rd \<address\>_ \[ \<count\> \]_
+
+The optional count parameter causes the operation to be repeated multiple times. If omitted, count defaults to 1.
 
 Example:
 ```
@@ -346,6 +349,20 @@ Resetting CPU
 ```
 In this example, you can see the program counter is set to FF3F, which is the 6502 reset vector on the Acorn Atom.
 
+## special (sp)
+
+This command allows NMI and/or IRQ interrupts to be temporarily masked.
+
+_Usage: sp \[ \<value\> \]_
+
+Legal values are:
+- 0 - enable NMI and enable INT/IRQ
+- 1 - enable NMI and disable INT/IRQ
+- 2 - disable NMI and enable INT/IRQ
+- 3 - disable NMI and disable INT/IRQ
+
+If called without parameters, the current value is returned.
+
 ## srec (sr)
 
 Uploads srecords into memory
@@ -413,7 +430,7 @@ The optional \<test mode\> (a decimal number!) can control the type of test:
 * value -4, test with inverse address pattern
 * value -5, test with pseudo random data
 
-If \<test mode\> is ommitted, a standard suite of tests is run, as can be seen in the examples below.
+If \<test mode\> is omitted, a standard suite of tests is run, as can be seen in the examples below.
 
 Example:
 ```
@@ -580,7 +597,9 @@ If \<trigger condition\> is omitted if defaults to F (trigger always).
 
 Writes a single host memory address.
 
-_Usage: wr \<address\> \<value\>_
+_Usage: wr \<address\> \<value\>_ \[ \<count\> \]_
+
+The optional count parameter causes the operation to be repeated multiple times. If omitted, count defaults to 1.
 
 Example:
 ```
@@ -613,7 +632,9 @@ _Usage: io \[ \<start address\> \]_
 
 Reads a single host IO address.
 
-_Usage: rdi \<address\>_
+_Usage: rdi \<address\>_ \[ \<count\> \]_
+
+The optional count parameter causes the operation to be repeated multiple times. If omitted, count defaults to 1.
 
 ## breakri (breakri)
 
@@ -643,5 +664,8 @@ _Usage: watchwi \<address\> \[ \<address mask\> \[ \<trigger condition\> \] \]_
 
 Writes a single host IO address.
 
-_Usage: wri \<address\> \<value\>_
+_Usage: wri \<address\> \<value\>_ \[ \<count\> \]_
+
+The optional count parameter causes the operation to be repeated multiple times. If omitted, count defaults to 1.
+