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VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... must admit it's a bit weird mixing the two ... instead of JP when doing Z80 code...
I ... idea for storing the 6502 flags, but I need to ... br /> [code]
exx
bit 6,c
exx
[code]
ld a,(flags)
and $40
[/code ... -
Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…
... , Mark Woodmass).
[*] NMI causes Z80 to unHALT (Philip Kendall; thanks ... C, H and P/V flags on repeated IO instructions (Philip ... mouse status and Simple 8-bit IDE interface to be saved ... -
Using INPUT without clearing last two lines of screen?I'm trying to print to the 22nd row of the screen using the ol' print #0 trick. Unfortunately, I require user INPUT which seems to wipe out the botto…
DJNZ works a bit like a FOR-NEXT loop, ... what it does to the flags. When doing assembly language, you ... the instruction does to the flags, not just to the register ... 's working on. The Zilog Z80 User Guide, available from zilog ... -
Thinking in Assembly (first efforts)The following is one small routine to educate myself on a few concepts (jumps, flow control, routines, CPI): [code]searchmem xor a …
... the tables from [url]http://z80.info[/url]. But I'll ... a ; search for 0. reset flags
cpi ; a-(HL)
bit: Attention is everything and the table from z80.de I ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... ]OR (HL)[/B] is another bit of complicated shortcutting. Functions that ... bit that says [B]readkey[/B] is a label. When writing Z80 ... other one is the flags. There are flags to indicate if something ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... 's another register on the Z80, the stack pointer ('SP'). This ... is paired up with the flags to form AF, which can ... to HL to draw a bit of the sprite, then POP ... -
Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... /> All the z80 registers are 8 bits: A, F (flags), B, C ... , IYL, IYH, The z80 architecture allows these 8 bit registers to be ... PC (program counter, the 16 bit register that holds the address ... next instruction), SP (the 16 bit register pointing at the address ... -
Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... exotic flags emulation. Certified Mark Woodmass' Z80 Test Suite-friendly [URL="http://bit ... .ly/bJlHW1"]http://bit.ly ... -
Vic 20 game better than Speccy version?Years ago, when I had my Vic 20 I had a game called Blitz, it was on the welcome tape in fact. Very simple game, but strangely addictive. For those t…
... contains the emulator as a .Z80 snapshot)
After this ... in BASIC it is a bit toooooo slooowwwww. The m/c ... the Z80 and 6502 share accumulators and C/Z/N flags! (Originally ... -
Vic 20 game better than Speccy version?Years ago, when I had my Vic 20 I had a game called Blitz, it was on the welcome tape in fact. Very simple game, but strangely addictive. For those t…
... contains the emulator as a .Z80 snapshot)
After this ... in BASIC it is a bit toooooo slooowwwww. The m/c ... the Z80 and 6502 share accumulators and C/Z/N flags! (Originally ... seems to be being a bit tempremental recently, that I must ... -
My emulator has a CPU bug, any ideas?.Hi all, I am writing a Speccy emulator in PureBASIC but have an odd bug. The spectrum interprets the odd numbers incorrectly whenever they are typed…
... carry flag from the bottom bit by mistake - perhaps you're ... flag (and the undocumented bit-5/bit-3 flags)?
Anyway, I ... /fuse-emulator/trunk/fuse/z80/tests/]FUSE Z80 test suite[/url] for ... -
Correct flag response to BIT n,(HL) etc.When running the test program suggested by Arjun (thanks again), all intructions are passing the flag tests except the BIT n,(HL), BIT n,(IX+dis) and…
... been a great help. My Z80 code now passes all MEMPTR ... .
My BIT n,(IX+dis) and BIT n,(IY+dis ... affected flags as am I am for the other BIT instructions except bit ... 3 and bit 5 which are ... -
Correct flag response to BIT n,(HL) etc.When running the test program suggested by Arjun (thanks again), all intructions are passing the flag tests except the BIT n,(HL), BIT n,(IX+dis) and…
... can think of the indexed BIT operations failing, assuming MemPtr is ... *other* flags aren't being set correctly for the BIT operation! I ... all the flags are being set correctly for the BIT? B'cos ... well as the other indexed BIT operations will fail the z80 tests. -
Correct flag response to BIT n,(HL) etc.When running the test program suggested by Arjun (thanks again), all intructions are passing the flag tests except the BIT n,(HL), BIT n,(IX+dis) and…
... *other* flags aren't being set correctly for the BIT operation! I ... all the flags are being set correctly for the BIT? B'cos ... the other indexed BIT operations will fail the z80 tests.[/QUOTE]
BIT n,(HL) passes ... -
Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... /> [URL="http://www.z80.info/"]http://www.z80.info/[/URL]
This ... found for the Z80:
[URL="http://www.z80.info/z80code.txt ... "]http://www.z80.info/z80code ... 8-bit operations on single registers like DEC B affect the flags ... -
designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... all contained are also 8 bit instruction. You mentioned about having ... bits for 16 registers. The Z80 generally only commits 3 bits ... the Z80 instruction set is a lot more complex bit still the ... , clearing the Z and C flags for example.
6) You ... -
The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …
... a progression from the 8 bit Master System - that is ... reasons it contained a Zilog Z80.
I ... is a 16/32 bit processor with a clock ... The 68K has sixteen 32 bit registers. You will have ... just word sized character codes+flags for palette selection, X/ ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... implementing a simple 32 bit CPU in an FPGA ... had every time I write Z80 asm). In summary, ... />
* Simple 32 bit architecture (32 address/32 data ... .
* 32 x 32 bit registers
* Program counter ... and r29 as a status flags register)
* If I ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... learnt assembler on the Z80 so I started out with ... 80486 in protected mode (32 BIT) gives me seven general ... and many clever uses of flags was just a dream!!! ... - It is a super charged Z80.
So my ... basic functionally that even the Z80 had. You don't ... -
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... use it to learn about flags, compares, boolean algebra and ... various other elements of the Z80 instruction set:
[ ... br /> jr nz,space ; Remember; BIT clear when pressed!
Z80 registers during/after program ... -
Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …
... is the convention whereas in z80, it's returning with the ... zero in z80 involves wrecking the A register and disturbing flags so ... HL (or DEHL for 32 bit) for return values.
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... /> Machine type: Pentagon
BIT n,(IX+d)? failed (0x10 ... Woody's Z80 test suite, the failures on the flags test are ... : FBF7 failed, expected 220C
BIT n,(HL) : C8B0 failed, expected ... 6208
BIT n,(IX+d) : DE69 failed ...Zetr0's Catchup Time (hardware / software)Hello there my fellow ZX'ers I have been soaking myself into the "world of spectrum" and more I do, the more I realize I have to play catchup.... a …
... safe environment etc., maybe a bit easy for a c coder ... .z80.info/#BASICS_INST[/url]
Z80 opcode information, what they do, which flags ... ://cdn.contextstatic.org/downloads/highlighters/z80.chl]z80 highlighter[/url].
Rendering techniques in emulatorsI've been giving thought to the possibility of speeding up the rendering in Zero considering I've been putting it off long enough. My approach is c…
... . Once done, reset all the flags to false. The majority of ... you'll save a fair bit of time that way.
Z80 and AY emulation, running at ... only get rendered when the Z80 emulation thread is waiting (sleeping ...Rendering techniques in emulatorsI've been giving thought to the possibility of speeding up the rendering in Zero considering I've been putting it off long enough. My approach is c…
... . Once done, reset all the flags to false. The majority of ... you'll save a fair bit of time that way.
Z80 and AY emulation, running at ... only get rendered when the Z80 emulation thread is waiting (sleeping ...Sabre Wulf - don't you just hate itThere's lots of Speccy opinions that divide us, but one thing I seem to stand alone in is my dislike for Sabre Wulf. I'm not joking now, I don't like…
... code, where the wrong bit of the flags register is tested (parity ... /overflow bit is erroneously tested IIRC ... so well known behaviour of Z80 processor (something like undocumented instructions ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... here. Am I right that Z80 microprocessor makes no real distinction ... )? Carry, half carry and overflow flags during subtraction are affected in ... distinction between a "carry TO bit 4" in case of addition ... and "borrow FROM bit 4" in case of subtraction ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... before, we add it bit by bit starting from the least ... manual", Zaks' "Programming the Z80" and Sean Young's "The ... Undocumented Z80 Documented") are pretty inconsistent - ... different about behaviour of some flags than other documents which ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... ;543753]Am I right that Z80 microprocessor makes no real distinction ... )? Carry, half carry and overflow flags during subtraction are affected in ... number of ones in its bit pattern?
[/quote]
It ... an overflow into the top bit.
(For what ...
