I have seen in more than one places - the following way of emulating i.e cycles is passed into emulate function int CPU_execute(int cycles) { int cycle_count; cycle_count = cycles; do { /* ...

I have a bizarre problem - I'm hoping someone can explain to me what is happening and a possible workaround. I am implementing a Z80 core in Java, and attempting to slow it down, by using a java.ut...

I'm currently developing an emulator for the good old GameBoy and I'm facing some problems understandig how some basic operation codes have to be implemented. Right now I'm implementing the AND o...

EDIT, GOOD NEWS! 10 years later, I decided I finally had to sit down and make this happen. I wrote the necessary convert-8080-to-z80-or-x86 and convert-z80-to-x86 tools, converted the Sargon...

On Gameboy Z80, exactly how does the LD HL,(SP+e) operation affect H and C flags? (Half-carry + carry) Reference: http://www.devrs.com/gb/files/opcodes.html

I'm new to the TI programming platform. I hope to get some pointers on what's my best route for this. I'm required to produce a series of arithmetic and graphing functions compatible across TI-83(p...

In Z80 machine code, a cheap technique to initialize a buffer to a fixed value, say all blanks. So a chunk of code might look something like this. LD HL, DESTINATION ; point to the source LD DE, D...

How do you add a 16 and a 8 bit register with carry (for example, HL, and A)?

Every time I assemble an application for the TI-83+ calculator (Z80 processor), it stops running at CALL. Here is an example ("Hello") — it starts running just fine, but the calculator freezes at t...

I'm very new to the concept of writing an assembler and even after reading a great deal of material, I'm still having difficulties wrapping my head around a couple of concepts. What is the proces...

I'm trying to learn BNF and attempting to assemble some Z80 ASM code. Since I'm new to both fields, my question is, am I even on the right track? I am trying to write the format of Z80 ASM as EBNF ...

I have a .z80 memory dump. How do I reverse engineer it? What do I need to know? How can I minimize manual labour?