Jump to content


New Members
  • Content Count

  • Joined

  • Last visited

Community Reputation

1 Neutral

About tms9918

  • Rank
    Combat Commando

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Thank you everybody. Indeed, M1 is available! Just for curiosity, I wrote a program that tests all opcodes (including the undocumented ones) and records the execution on a ‎Z84C0010AEG‎ All the observed patterns are the following [('rd',), ('rd', 'rd'), ('rd', 'rd', 'rd'), ('rd', 'rd', 'rd', 'rd'), ('rd', 'rd', 'rd', 'rd', 'rd'), ('rd', 'rd', 'rd', 'rd', 'rd', 'rd'), ('rd', 'rd', 'rd', 'rd', 'rd', 'wr'), ('rd', 'rd', 'rd', 'rd', 'wr'), ('rd', 'rd', 'rd', 'rd', 'wr', 'wr'), ('rd', 'rd', 'rd', 'wr'), ('rd', 'rd', 'rd', 'wr', 'wr'), ('rd', 'rd', 'wr'), ('rd', 'rd', 'wr', 'wr'), ('rd', 'wr'), ('rd', 'wr', 'wr')] I attach the list of the instructions associated to each pattern for posterity. summary.zip
  2. Yes, I am totally ok with instructions with no writes. I want to be able to stop the system and inspect it,without particular focus on the precise moment I stop it. I just do not want to introduce garbage (i.e. operands with wrong values). I already use emulators extensively, the hardware solution is for inspecting parts of the system which are not documented.
  3. I am trying to develop a debugger that interrupts the program flow by inserting rst instructions on the bus. I want to do it at the beginning of an instruction, i.e. I do not want to modify later parts of multi-byte opcodes / parameters of the opcodes. Unless I solder additional wires (which I'd like to avoid) I have no access to M1. My idea is to detect writes, and replace the data on the bus on the fist read after a write. This holds correct only if there is no instruction that performs a read after a write. If I am not mistaken such instruction does not exist, but I may have overlooked some atypical case. Is there any (possibly undocumented) instruction that performs a memory read after a memory write, or can I be sure that no such instruction exists?
  • Create New...