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Fixed point math lib?Is there a liberally licensed fixed point math lib for z80 somewhere? When searching, I expected to find a bunch of GPL'd ones and perhaps one or two…
... together from those.
http://z80-heaven.wikidot.com/math
registers. The spectrum rom actually contains ... -
Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…
... under sdcc. sdcc expects its registers not to change value through ... an address mapped to the z80's i/o space)
registers in inlined asm. You'll ... optimizer and if NIRVANA_start() affects registers, may cause bugged code to ... -
Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... , emulators like Gerton Lunter's Z80 took advantage of the similarities ... architecture and the Z80 architecture and ran the Z80 core emulation so ... that a register from the Z80 core was stored in a ... from the vast amount of registers an ARM9 core has (or ... -
Internet enabling a SpectrumHi, Yonks ago, I floated the idea of using one of these: http://www.mycal.net/old/wsweb/img/s7600a.pdf ..to Internet enable a Spectrum. I d…
... /sdcc_iy
src/name_1/z80
src/name_1/asm. ... does not use any index registers, you can have one ... /z88dk/libsrc/_DEVELOPMENT/string/z80/asm_strtok.asm?revision=1. ... z88dk/z88dk/libsrc/_DEVELOPMENT/string/z80/__string_strtok_p.asm?revision=1. ... -
Can anyone show a slight diagram of how pokes work in a jet set willy game for example?I know its kind of something to do with machine code and Memory addresses etc but would be nice to see a youtube video or some drawings etc ? .Many t…
... guide on the chips and registers etc?[/quote]
Most ... a bit of experimentation. The Z80 instruction set is described in ... -
Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…
... few more variables representing the z80's registers - A, F, B, C ... done, you do whatever the z80 would do with that value ... -
Where can I get some AY music asm/binary files?Is there an online repository for these types of file that people can download and use on their projects? Seen something similar for MSX (Z80 base…
... /> Seen something similar for MSX (Z80 based AY I think), will ... access the AY-3-8910 registers, so you'd need to ... a R800 CPU which is Z80 backward compatible but has a ... -
(Collected) Darkhog's noob question about z80 assemblySince when I'm learning new language or library, I tend to ask lots of stupid (for any advanced person) questions and I don't want it to have mess up…
[quote="Darkhog;52514"]
- Regular IF z80 equivalent. e.g. If A -
Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... not that easy on the Z80, but it is possible. Unfortunately ... than you could handle in registers. You'd be likely to ... 't have to constantly juggle registers. -
Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... because they're the only registers that can do indexing. e ... old Gameboy Z80 there were no IX or IY registers, so we ... stuff is doing...
The Z80 PUSH instruction reserves 2 bytes ... -
Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... working set of variables in registers (working set = stuff you need ... look at some of the z80 follow ups this penalty is ... it's slow on the z80, programmers take great care to ... /libsrc/_DEVELOPMENT/arch/zx/graphics/z80/asm_zx_pattern_fill.asm?revision=1.9 ... -
Spectranet UsersHi! I'm testing Spectranet interface on Fuse and I'm thinking on emulating spectranet on ZEsarUX. Some questions: 1) Are there many active Spec…
... , I dunno.. like putting the z80 in the server and take ... from there, dealing only with registers, transmitting the whole ram or ... state of the super-z80 on every connected z80 in particular. If ... -
z88dk TutorialHi, Could anyone direct to to a recent MS Windows based tutorial on getting started with z88dk. I know a small amount of C, so it's more the comp…
... currently: cpm, embedded (ie any z80 system) and zx.
registers you are allowed to use ... AF', IY, some exx set registers because they're reserved by ... be written using all the z80 features. To accommodate the zx81 ... -
New ZX-Uno Spectrum CoreFor those who haven't noticed, a new Zx-Uno Spectrum core has been published: http://www.zxuno.com/forum/viewtopic.php?f=14&t=406 Those lucky e…
... ía the ZX-Uno registers, instead of ULAplus registers, to avoid future ... a 21MHz CPU mode? (fastest Z80 available) -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... opcodes are (unintended?) features of Z80 processors, and they're present ... they will work in any Z80 clone from any manufacturer (maybe ... some modifications related to index registers). -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
The gameboy CPU doesn't even have the IX/IY registers. I tend to think of it as an enhanced 8080 version, rather than a Z80 clone. -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... are (unintended?) features of Z80 processors, and they're present ... they will work in any Z80 clone from any manufacturer ... some modifications related to index registers).[/quote]
I ... different behavior depending on the Z80 model.
... -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... talk about the missing shadow registers... or missing ex de,hl ... CPU was touted as being "Z80 Derived" presumably to make it ... -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... am always running out of registers in fast graphical functions, what ... ]
Timings for all Z80 instructions:
http://www ... -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... could be substituted for the Z80 are going to be ... not sure on *all* the Z80 variants.
I'd ... on the Z80.
What is left in the registers will tell ... if you are on a Z80 or Z180 descendant.
... a MPY isn't a Z80, and anything with undocumented ... -
IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…
... sure on *all* the Z80 variants.
I'd ... on the Z80.
What is left in the registers will ... a MPY isn't a Z80, and anything with undocumented ... I found some of the Z80 FPGA cores support IXH, SLL ... , that probably means 100% Z80 compatible.
If it' ... -
Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…
... how to make your Z80 code faster as you ... some common optimizations on the Z80.
Here is ... find a lot of Z80 resources here for more ... info:
http://www.z80.info/
...
Operations with those registers / instructions take 19 to 23 ... -
Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…
... with; I'd class the z80 optimisations and T-state counting ... use the IX or IY registers at all, except for a ... didn't use the shadow registers HL' etc., or the EXX ... -
Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…
... learning how to make your Z80 code faster as you go ... some common optimizations on the Z80.[/quote]
Bad advice, imho ... ) wherever possible, to avoid wasting registers to hold constants
* Main ... make smart use of the Z80's instruction set, it's ... -
Running out of fingers in AssemblyDear all, Still trying to learn Assembly and have put a few routines together. However, as my routines become a little more involved I find myself…
... : if you're using registers other than the accumulator " ... * The z80 instruction set is not orthogonal. This means the registers are ... and deliver parameters in the registers expected by compute_lp. Then ... task at hand) in registers inside those inner blocks. ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... extremely non-orthogonal nature of Z80 will make this of very ... you have to use specific registers for a specific purpose. And ... write are all different and Z80 code is generally chock full ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... extremely non-orthogonal nature of Z80 will make this of very ... you have to use specific registers for a specific purpose. And ... write are all different and Z80 code is generally chock full ... know how an instruction influences registers. You know that LD A ...
