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debuggingI have read a fair bit about z80 machine code and am ready to experiment using Tasm. One concern is how would you debug using this method of programm…
... your entire program on paper, instruction by instruction (unless you're making ... -
Games and Programs written in BASinHi all, The new version of BASin is about to be released in the next few days or so, and I'm gathering up example programs to include with it. I se…
... the keyboard through an IN instruction won't work, as the ... -
Is Gunfright by Ultimate: Play the game any good?I only ask, as I have seen it recently on sale for ?10...
... box and with the quality instruction booklet for ?1.99. I ... -
Is Gunfright by Ultimate: Play the game any good?I only ask, as I have seen it recently on sale for ?10...
... box and with the quality instruction booklet for ?1.99. I ... -
Hackers Workbench from SD SoftwareHas anyone got a copy of Hacker's Workbench, to sell? Or know where I can purchase a copy from? It was advertised in the Format magazines. Format m…
... Filer, Plus D Toolkit. - the instruction are being converted into a ... -
ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... to react on a "IN" instruction from CPU.
BTW ... -
ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... and pipelined architecture for 1 instruction/clock cycle...
Z80 processor question...Suppose we fill the entire $0000-$ffff memory range with $ed. What will the processor do ? I suppose it will get locked, but will it still respond to…
No because the current instruction will never complete executing.Z80 processor question...Suppose we fill the entire $0000-$ffff memory range with $ed. What will the processor do ? I suppose it will get locked, but will it still respond to…
... is retrieved in a second instruction fetch and processed according to ... is not treated as an instruction prefix. Interrupts would be handled ... IX,[BC|DE|IX|SP] instruction
[ This Message was ...First speccy game you ever ever played..Just having a play on Jet-Pac (on my +2 I hasten to add as I would never play a denied game on an emulator...no sireee ;) ) and suddenly realised tha…
... , and disobeying a direct parental instruction, I'd got Car Journey ...Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…
... /> Suppose we have the CB instruction "SET b,r" (b=bit ... this still apply if the instruction is BIT ? It doesn't ...Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…
... a BIT n,(IX+d) instruction, bits 3 and 5 are ... that in any (IX+d) instruction or conditional JR, the final ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... reasons: firstly, if the instruction before the interrupt is longer ... occur immediately after an EI instruction, as when IFF1 is ... EI/RET and the instruction before the interrupt finished ... disabled ('masked') by the DI instruction, and is always accepted. ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... M-cycle of every every instruction, the Z80 will sample the ... last machine cycle of an instruction.
[quote]
[ ... simple EI/RET and the instruction before the interrupt finished just ... /> [/quote]
RETI is the instruction to use, not RET. It ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... reason for using the RETI instruction is if you use the ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... are added. A "RST n" instruction does indeed take 11 T ... in an interrupt acknowledge -- the instruction is obtained from a peripheral ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... reason for using the RETI instruction is if you use the ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... mode 2 because placing an instruction opcode on the bus is ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... mode 2 because placing an instruction opcode on the bus is ... peripheral time to place an instruction / vector on the data bus ...Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... the IM2 interrupt (using the HALT command)
Paint the offscreen ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... the end of the next instruction, the NMI will still be ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... the end of the next instruction, the NMI will still be ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
In the instruction set tables by Zilog from 1977 in the book 'Z80 Assembly language programming for students' by Roger Hutty DI and EI are described as setting IFF1 only.
[ This Message was edited by: Fraser on 2004-07-31 20:46 ]SAGA 1 Emperor KeyboardI have a SAGA Emperor replacement keyboard gathering dust in the attic, and was thinking of auctioning it on Ebay, but don't know what it's worth. Sh…
... and has its poly-inserts, instruction sheet and all the screws ...Abu Sumbel ProfanationI just downloaded the new TZX from the TZX Vault, but I can't get it to play. When I use Spectaculator it loads and will get to the menu then nothing…
Tried that, still doesn't work. The character just keeps jumping right. Also in Spin, on the main menu pressing 4 for instructions takes you briefly to the instruction page but very quikly jumps back to the menu.Lambourne games1) "Cricket Player Data Cassette - "(blah blah).TZX Do these files go with another program (as the name would suggest) or are they stand-alone ? 2…
I've got wads of instructions, but they need scanning then typing up by the instruction preservation bods.
SteveInterrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... , read memory or just execute instruction on that page). it slows ...An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…
... be (e.g. execute the instruction pointed to by the PC).... (What does SPIN have?I have been asking this question since somebody answered another I had made that RealSpectrum was a brilliant emulator. It is in fact. But... I see e…
... people would bother reading the instruction before using anything :p
What does SPIN have?I have been asking this question since somebody answered another I had made that RealSpectrum was a brilliant emulator. It is in fact. But... I see e…
... people would bother reading the instruction before using anything :p[/quote ...
