-
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…
... CB instruction "SET b,r" (b=bit, r=register (different from (hl)))... If ... the result to the initial register r.
My question is ... -
Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …
... 6..0 of the register R are picked up in ... machines snow appears if register I contains a value ... the bits 6..0 of register R (it should already be ... with a question of register R's participation in the ... it in addresses $8000… $BFFF (register I within $80… $BF) — ... -
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…
... CB instruction "SET b,r" (b=bit, r=register (different from (hl)))... If ... the result to the initial register r.
[/quote]
It ... 's only copied to the register also if you use one ... here is in the Flags register. -
I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …
... uses reading ROM or reading register R (or combination)
[code]
ld a, r
xor (hl)
ld ... -
How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
[url="http://map.tni.nl/sources/external/z80bits.html"]http://map.tni.nl/sources/external/z80bits.html[/url]
or reading register R
or reading ROM -
How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…
... />
[quote]
or reading register R
or reading ROM
I never saw R as a good source for ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... , from using ROM content or register R (don't forget it's ... -
z80 Startuphi everyone, does the z80 upon start up reset all registers (including A) to 0? Many thanks, Robin
Higher memory is not being accessed but you may be seeing memory refresh cycles which occur after every opcode fetch. That has the address IR (I register, R register) placed on the bus. -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... r,(HL) Load register r with location (HL).
LD r,(IX+d) Load register r ... r,n Load register r with value n.
LD r,r' Load register r with register r'.
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
... each opcode if the I register is betwen 0x40 and 0x7F ... the video memory using the register R as an additional offset of ...ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... in the floating bus. If register I is between 0x40 and ... display):
1) The R register value in case of first ... previous reading which is the register R in the case of the ...ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... in 128kB mode)
;correct register R value for all snapshots
;correct register R value for all snapshots
esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)
... routines are bugfixed by me. Register R is also correct user can ...Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
Agreed that it can't be OUT.
Could bit 7 of register 'R' be detected?
Sometimes you find LS158 instead of 157Random object placementI'm looking for some advice on placing objects randomly in a game. I have a routine that reads a table and prints the corresponding object: 0 prints…
... can also combine it with register R as follows:
[CODE ... /> xor h ; combine FRAMES and register R
ld h,a
The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
[b][u]The I register pointing to $40–$7f causes ... . The contents of the refresh register (R) are placed on address lines ... the contents of the interrupt register (I) is put on address ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... the progress of the R register. At one point I ... between the reads of R is pretty much static ... contended RAM on the R-register? I do not run ... no effect as the R-register is internal to the ... , Scorpion, ...) affect the R-register differently? Again I would guess ...The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…
... found some documentation regarding the R register (in that it is updated ... the maximum value of the R register is +127? If so, do ...Canny use of the 'r' register?Seeing Sokurah's code in the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=583188#post583188"]crunch sound thread[/URL] has made me th…
... made me think about the r register.
I've used ... eg:
ld a,r
cp n
jp ... any crafty uses for the r register?R registerI'm cross-posting this as a spin-off of a [url="http://www.worldofspectrum.org/forums/discussion/52748/zx-spectrum-cartridges/p2"]thread in "Hardware…
... support & correctness of the R register behaviour.
... br /> [quote]Memory Refresh (R) Register.
The Z80 ... /> NOTE: Reset also sets R register to zero, hence also changes ... instruction fetch. Hence R register can be considered a ...Madness or inaccurate docs: RR r/RL r?According to the Z80 User's Manual, the instruction RR r/RL r should rotate the carry flag into bit 0 or bit 7 of the register in question (bit 0 or …
... Manual, the instruction RR r/RL r should rotate the carry flag ... or bit 7 of the register in question (bit 0 or ...[MOD] R-Type IIII suppose it makes sense now to register [URL="http://www.worldofspectrum.org/forums/showpost.php?p=401659&postcount=15"]R-Type III[/URL] back in the…
I suppose it makes sense now to register [URL="http://www.worldofspectrum.org/forums/showpost.php?p=401659&postcount=15"]R-Type III[/URL] back in the archive as a mod...Using R as a loop counterThis is just something silly I've found a while back. xD [b][How-to][/b] Setup your routine like this:[code] ld a,X ;see below ld r,a loop ;your …
... ,X ;see below
ld r,a
loop
; ... from the final 'ld a,r: jr nz,loop' commands) ... br /> and #7F
ld r,a
.l2
nop ... /> inc b
ld a,r
jr nz,.l2
register, yay!
So ...The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …
... CPU. It seems that every register other than the HL pair ... [/b]—[b]F[/b]lag register
[b]I[/b]—[ ... vector
[b]R[/b]—Memory [b]R[/b]efresh
register [b]X[/b]/[b]Y ... /> Then come the good-old register pairs:
[b]SP ...WoS on DVD-R?Hmmm, a chat with dave and cerb on #speccy has got me thinking about putting WoS onto DVD-R ... i've done the maths on this, and if I got 40 firm or…
... about putting WoS onto DVD-R ... i've done the maths ...Help, Space-Time Productions's CNCS32.dll isn't working in w2000Hi, I know this is not a support forum, but as you were talking about remakes I decided to give it a try. However... (gosh! this looks like R Tape L…
... /> However... (gosh! this looks like R Tape Loading Error)
Trying to register the DLL with regsvr32 produces ...ANN: Spectaculator 5.1Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…
Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows
95, 98, ME, NT 4, 2000 and XP.
Spectaculator emulates the 16K/48K/128K/+2/+2A/+3 Spectrums and plenty of
additional hardware.
Spectaculator is ...
