... the 6502 features on the z80 (eg the zero page) and ... translation of 6502 code to z80 code with careful mapping of ... though -- they emulate each 6502 instruction via table lookup, rather than ... about the memory map and interrupt mappings. And that, of course ...

... and thoroughly tests almost all Z80 instructions The good news is ... /CCF executed as first instruction of the interrupt handler always does OR ... anyone willing to update their Z80 emulation core to match the ...

... of each display line, an interrupt is generated by the ULA ... on the bus during the Z80's refresh cycle, which allows ... CPU gets fed a NOP instruction, so it does nothing for ... that instruction is executed. The CPU then pauses until the interrupt is ...

... had troubles using the Assembler z80 feature. I also followed the ... action is happening. Using an interrupt routine is a common way ... 't *need* to use an interrupt routine - if you have a ... a second (using the HALT instruction to regulate timing), you can ...

... .
[*]IY register available in interrupt mode 1
[*]Key click ... the ROM as a JP instruction.
[*]More room for BASIC ... on divIDE and divMMC.
[*]Z80 LDIR block copy: PUT 49152 ...

... address 0xd4d4 on interrupt.
* bpoke() pokes a z80 JP instruction at the ... right after that JP instruction

Every interrupt a "JP my_isr ... 'EI' instruction followed by some unknown bytes so on interrupt an EI ...

... the interrupt occurs when the CPU is busy processing a long Z80 instruction ...

... being executed by the z80. It happens to be ... address $d4d4 a jump instruction to your isr. What ... table and 3-byte JP instruction, the table must start ... 3-byte JP instruction so the z80 will jump to ... z80 is expecting an 8-bit peripheral ID when an interrupt ...

... br />
The Z80 IORQ cycle (time from ... to respond to the interrupt and service it. Best ... to respond to the interrupt and get its vector ... to jump to your interrupt service routine), leaving you ... instruction, your ISR might not even start to run before the Z80 ...

... for the Z80 would be to use an RST instruction take the ... processors typically call SWI (software interrupt) and have this fire off ... it's a 1 byte instruction and trivial to decode).

... for the Z80 would be to use an RST instruction take the ... processors typically call SWI (software interrupt) and have this fire off ... it's a 1 byte instruction and trivial to decode).[/QUOTE ...

... Sitting between the memory and z80, I was starting to ... the Z80 would be to use an RST instruction take ... typically call SWI (software interrupt) and have this fire ... 's a 1 byte instruction and trivial to decode ... out if the nmi interrupt caused arrival or if ...

... interrupt occurs, the computer cannot stop "in the middle" of a Z80 instruction ... . It must finish executing the current instruction ... executing an instruction and didn' ... Z80 instructions take more than 20 T-states, thus causing longer interrupt ...

... interrupt occurs, the computer cannot stop "in the middle" of a Z80 instruction ... . It must finish executing the current instruction ... executing an instruction and didn' ... Z80 instructions take more than 20 T-states, thus causing longer interrupt ...

... impression that raising an interrupt upon detection of a ... HALT to see if gdb-z80 can really /as advertised ... I am reworking gdb-z80-stub to use HALT ... Debugger, inside run gdb-z80, connect to a real ... at the breakpoint with another instruction (such as HALT) as ...

... -serif]The HALT instruction halts the Z80; it does not ... 5) HALT instruction [4] The HALT instruction halts the Z80; it ... From [URL]http://www.z80.info/zip/z80-interrupts_rewritten.pdf[/URL]
instruction last so long. Now an interrupt is accepted ...

... z80 user manual says:
[QUOTE]The enable interrupt instruction sets both interrupt ... maskable interrupt. Note
that during the execution of this instruction and ... the following instruction,
maskable ...

... re specifically masked for the instruction that follows.
... and the instruction, so the Z80 must mask ... instruction and the following instruction'. It's surely quite possible to interrupt the Z80 ... with PC pointing at an EI instruction, ...

... possible to interrupt the Z80 with PC pointing at an EI instruction, if ... of my z80 books almost says this: "An EI instruction sets both ... temporary copy that advances during instruction execution) after fetching & executing ...

... this instruction. I certainly plan to modify the Z80 patches ... best to display the instruction in disassemblies. Any thoughts ... of IFF2, however, if interrupt happens _during_ these commands, the ... is an absolutely priceless instruction and emulation of its ...

... to know whether the current Z80 is CMOS, because it needs ... tell whether the last instruction updated the Z80 flags (in F) anyway ... P/V flag for NMOS Z80 emulation if this is the ... an extra unwanted instruction before getting to the interrupt handler, so 'fixing ...

... is an absolutely priceless instruction and emulation of its ... to reliably detect CMOS Z80 on a 48K spectrum, ... whether other emulators handle interrupt acknowledgement before saving snapshots ... just finished instruction.

As for SZX interrupt time, ...

... interrupt occurs, the computer cannot stop "in the middle" of a Z80 instruction ... . It must finish executing the current instruction ... executing an instruction and didn' ... Z80 instructions take more than 20 T-states, thus causing longer interrupt ...

... Halt ?[/QUOTE]
A HALT instruction. Now there are three HALT ... code until it receives an interrupt (/INT on pin 16). This ... .

So, is the Z80 socketed?
... If yes, have ...

... /> The Spectrum ULA and the Z80 could have been implemented in ... be a Spectrum ULA or Z80.

Your definition seems ... a perfect FPGA implementation. The Z80 also saw at least one ... interrupt state with a "LD A,I" instruction, whereas on the CMOS Z80 ...

... that the Z80 finishes the current instruction before servicing ... was executing a specific instruction. After that it ... interrupt would occur on. Using an equivalent inert version of the instruction ... for the real interrupt handler would ...

I believe the Z80 internally executes repeated NOP's until an interrupt is generated, which take 4T each.

If this is the case, then the NOP instruction needs to complete before the interrupt is handled.

B

... believe the Z80 internally executes repeated NOP's until an interrupt is ... the NOP instruction needs to complete before the interrupt is handled.