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| -rw-r--r-- | instructions.txt | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/instructions.txt b/instructions.txt index b7d96ef..e06b48a 100644 --- a/instructions.txt +++ b/instructions.txt @@ -110,6 +110,16 @@ Allows you to redefine the DS's joypad and buttons to ZX81 keys. Follow the on-screen instructions. + MACHINE CODE MONITOR + Provides access to a basic machine code/memory monitor. This lets + you watch the ZX81 execute op-codes, or single-step over them. + + Unless you're actually interested in such things you'll never need + to go near this option -- it's there to track down emulation bugs + as much as anything. + + See the second to last section for more details. + CANCEL Cancels the menu. @@ -184,7 +194,41 @@ register has changed. -7. Configuration Options +7. Machine Code Monitor +----------------------- + + On starting the machine code monitor the keyboard will go dim and get + overlaid with a text display showing you the Z80 instructions about to be + executed along with the current states of the registers in the Z80. + + The keyboard is dim, but still on display as the montitor does let you + use the keyboard. Note that all keys are sticky (like the shift key in its + default state) and that joypad mappings are ignored. + + With the monitor on display the following joypad keys can be used: + + START - Toggles between running continuously and single-step mode. + + A - If in single-step mode then executes the next instruction. + + X - Display a help page. + + SELECT - Toggles between the disassembly/register display and a + display of memory. + + L/R - The shoulder buttons change the address being displayed on + the memory dump. Hold the Y key at the same time to make + it jump in bigger steps. + + B - Cycles the value used for the memory dump -- either the + address as set with the shoulder buttons, or one of the + registers: HL, IX, SP, IY, BC or DE. + + Press the config bar at the bottom of the soft keyboard to exit the + machine code monitor and return to normal running. + + +8. Configuration Options ------------------------ STICKY SHIFT |