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Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…
... does the Z80 read the opcode that would have followed the ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... address 38, which has the opcode RST 38H, thus making it ... -
Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…
Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
... this way, though; just doing HALT would have the same effect ...Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
... this way, though; just doing HALT would have the same effect ...Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
I replaced the loop with a HALT and there seems to be no difference!!!!Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
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If you use a HALT instruction then the CPU will ...Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... cleared that space, by using HALT, and then waiting for (128 ...Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
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1. I start with HALT command to begin my routine ...spectrum disks for saleI have 296 titles on around 200 disks for sale. Offering them on here first before ebay gets them. Contact me at [email="cluncastle@hotmail.com"]clun…
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somebody actually trying to halt the good deeds by the ...There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…
... at least compare how your opcode handlers work as opposed to ...There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…
... test for every single Z80 opcode, with the correct[1] output ...Sid Spider on WOS.Can we take it that the inclusion of Sid Spider on WOS is official confirmation that it is no longer being developed? :( :( :(
... we both came to a halt in development for our own ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... +d),B used for this opcode. Probably best for you to ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... hold the result of the opcode.
000 - b
001 ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... understand the exact way this opcode works.
According to ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... should have done brute force opcode lookups rather than trying to ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... 's actually one 8 tstate opcode which does nothing, rather than ... must be an 8 tstate opcode, not two 4 tstate opcodes ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... 's actually one 8 tstate opcode which does nothing, rather than ... which to form the extended opcode; processing continues without interrupts;
opcode as if the DD didn ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... this effect the DD-prefix opcode decoding logic? If the op ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... this effect the DD-prefix opcode decoding logic? If the op ...Z80 register decoding document error?Hi, I've been working on a disassembler using the following document written by Cristian Dinu (aka GOC?). [url="http://www.z80.info/decoding.htm…
... the DD ED forms an opcode on its own, we'll ...Most frustrating games ?Ever played a game where you can't almost even begin to play because you've already been killed ? I think of titles like Platoon or Mutant Zone...
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... cycle into an INC C opcode. Any contention on the memory ...The SPIN AssemblerI am using the assembler in Spin but I am having a problem with "DEFS". I was hoping that it would allocate a section of memory but it doesn't seem t…
... . It says 'invalid combination of opcode and operands'. The other listing ... />
I've had this opcode/operand thing happen with perfectly ...Problems with SpinHi, took this emulator for a spin, loaded a hacked version of JSW and willy keeps jumping. Tried another version of JSW and again, he constantly jump…
... would slow to a grinding halt as I email the entire ...
