Shortcuts

• Step Over - F10
  For CALL, JR cc, JP cc, DJNZ, LDIR or LDDR instructions, debugger will try to step over the subroutine.
• Step Into - F11
  Debugger will step into the subroutine call or conditional jump.
• Step Out - Shift + F11
  Debugger will step out of the subroutine using the current return address on the stack. So this will only work if the value on the stack contains return address.

Breakpoints

Two types of breakpoints are supported: on register value change or on memory write

Register breakpoints

Typical scenario is use a condition for PC register, for example PC==32768. This would break execution at the specified address. However any register can be used, for example HL==16384, A==0x79etc.

Memory breakpoints

Memory breakpoints can have two forms: trigger when specific value is written to e memory cell or more generic when memory cell is written. For example 16384==32 will break when value 32 has been written to 16384 memory address. If condition is just 16384, execution will break when any value has been written to that address.

Immediate window instructions, case insensitive:

• HELP - print help information
• PRINT [expression] or ? [expression] - prints a value of the expression
• GOTO address - sets the program counter to the address, equivalent of PC=address
• LIST [address] - disassembles the code, if no address is provided, it will disassemble the current PC
• POKE address,value - writes a value to the memory
• PEEK address - reads a value from the memory
• OUT port,value` - writes a value to the IO port
• IN port - reads a value from the IO port
• SAVE "filename" [address [,length]] - saves a memory to a file in binary format starting from the optional address optional length
• R=value - sets a register value

Register arguments:

A B C D E H L F IXH IXL IYH IYL AF BC DE HL IX IY SP PC I R AF' BC' DE' HL'

Number arguments:

• Decimal: 16384
• Hexadecimal: 0x4000 or $4000 or 4000h
• Binary: 0b1010 or 1010b

Examples:

• PRINT HL
• GOTO PC, GOTO 32768
• LIST, LIST 32768
• POKE 16384,0x3E
• PEEK 16384
• OUT 0xFE,$3E
• IN 254
• SAVE "screen.bin" 16384,6912
• A=10h, IXH=A HL'=DE, IX=0x4000, SP=0x8000, etc.

[!NOTE]
All instructions and operands are case-insensitive.