-
The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…
... inform us, getting that last bit of accurate emulation to run ... behaviour correct and getting the z80 timing versus raster position correct ... speed between the ez80 and z80 changes with the sequence of ... even with a Z80.
The flags and timing will ... -
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... /> 1. Read the highest set bit of B (1 or 0 ... /> 3. Move to the next bit (move left to right/high ... you might do this in Z80? Bit commands? -
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... /> 1. Read the highest set bit of B (1 or 0 ... /> 3. Move to the next bit (move left to right/high ... you might do this in Z80? Bit commands?[/QUOTE]
no, it ... result as shift by one bit left
[CODE]
before ... -
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... you might do this in Z80? Bit commands?[/QUOTE]
ld b,8 ;B =bit counter
MULT1: sla c ... MULT5 ;for the first set bit
djnz MULT1
bit set
MULT5: ... -
New Z80 CPU emulation testerI have finally wrapped up the new [URL="http://zxds.raxoft.cz/taps/misc/z80test-1.0.zip"]Z80 tester package[/URL] I have previously announced in [URL…
... br /> NEC 780
- Z80 FULL TEST
FAILS:
- Z80 FLAGS TEST:
- FAILS:
- ... passed.
-Z80 Doc FLAGS:
- All tests ... passed.
-Z80 CCF TEST:
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... . The crt[/B] (that small bit of code that runs to ... .
0x02b0 -- these are bit flags which I will document later ...binary mirroring in basicsame as last question, really. only this time i want to mirror an 8 bit decimal number
This will always be too slow in BASIC for any practical use, so I suggest you do it in [url="http://www.retroprogramming.com/2014/01/fast-z80-bit-reversal.html"]Z80 asm[/url] instead.
Regards,
Derek.Z80 Assembler for Win7 PC (64-bit)Does anybody know where I can get a decent Z80 assembler that will work on my 64-bit Win7 PC? I tried the first one in the WoS utilities and it would…
... a decent Z80 assembler that will work on my 64-bit Win7 ...Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…
... 'm little lost when different flags are set/reset after logic ... , that bit 7 is in play.
Is "Z80 CPU User ...My re-creacton of the Z80 8-bit Universal IDEI looked into my draw with various bits & bobs for PC and I found there a CF-IDE adapter, HDD ribbons and two CF cards. So, I was thinking to myself,…
... re-created the simple 8-bit IDE interface. My design is ... ://fotogalleria.info/pub/ZXSpeccy/Z80UIDE/Z80%20UIDE_3.png[/img]
< ... fotogalleria.info/pub/ZXSpeccy/Z80UIDE/Z80%20UIDE-smd_3.png[/img]
bit of failure. Checked all connections ...Z80 AssemblerSome of you may know that I'm working on a Z80 assembler. I thought I'd start a thread so I can see what people think and what they might want to see…
... I'm working on a Z80 assembler. I thought I ... only a placeholder for a Z80 assembler tool).
32 bit signed labels
Case ... to TASM but with a bit more intuition.
bit values. Bytes are then ...Z80 Emulator Source?Found a link to this on comp.sys.amstrad.8bit. i havent been with the discussion long but supposedly this is the source for a Z80 emulator. Forgive m…
... is the source for a Z80 emulator. Forgive my ignorance but ... know if it's a Z80 emulator for Spectrum or what ... , rrc, rl, rr, sla, srl, bit, res, set
ins_call_z_nn:
Z80 to TZX Converter !Hey Everyone ! I have a bit of time lately and I coded a little utility that can convert the Z80 snapshot (any version, 48k and 128k supported) to T…
... !
I have a bit of time lately and I ... utility that can convert the Z80 snapshot (any version, 48k and ...Decimals, bcd etc in z80...Working bloody full-time on my Ragnar Revival game right now - just finished the basic sprite engine and before I go on coding the actual 3d engine (…
... and display decimal numbers in Z80, such as score and time ... it z80-friendly, that is as one or two (16-bit) word ... handling and displaying decimals in z80?
EDITED:
Z80 ToolkitHi guys, As I was looking through my Spectrum games that I am giving away I found my beloved Z80 toolkit tape! It's by LERM software. Does anyone w…
... away I found my beloved Z80 toolkit tape! It's by ... ! I think the high memory bit on the tape isn't ...ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…
... similar debugging abilities for your z80 Assembly code routines
... a bit of a speed boost*.
A full featured Z80 ... every opcode supported by the z80. Supports Structures, Include/INCBIN, ... sound
All undocumented flags and opcodes emulated.
...ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…
... similar debugging abilities for your z80 Assembly code routines
... a bit of a speed boost*.
A full featured Z80 ... every opcode supported by the z80. Supports Structures, Include/INCBIN, ... sound
All undocumented flags and opcodes emulated.
...MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
... a misterious internal register in Z80 CPU (MEMPTR) which value is ... set or changed by some Z80 instructions and 2 bits of ... 5 of the Flags register after the instruction BIT n,(HL). But ... was not exactly known which Z80 instructions initialize the MEMPTR and ...How to write an IDE drive (8 bit)?Hi there. I want to build the 8-bit interface by Pera Putnik, and substitute the original ROM by an EPROM with the appropriate program in order to c…
... want to build the 8-bit interface by Pera Putnik, and ... do you copy files (.SNA, .Z80) to the hard drive? I ...Awesome ! ZX Spectrum emulator on Atari 8-bit !!! READ IT !Below here is a link to thread at atariarea portal where atari coders are trying to build zx spectrum (actually z80) emulator on atari 8 bit ! Sorry …
... zx spectrum (actually z80) emulator on atari 8 bit ! Sorry but all ... . They attempts to make an Z80 emulation.
[url]http://atariarea ... running on real atari 8-bit or atari emulator.
New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…
... br />
* Solid Z80 core - possible bugs aside, the ... flags as it should (the only little exception being the undocumented BIT ... , though, not the Z80 snaphsot format. Word of ... /> * 48k/128k Z80 snapshot support - the Z80 is a popular snapshot ...8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... that I can get the Z80 emulation at full speed ... 'm about to start the Z80 core for real.
... done either as 8-bit or 16-bit, with conversions where ... obviously be left as 16-bit, but what about the ... others? Will more 8-bit operations be performed than 16 ...First steps in Z80 machine codeI never got into machine code much back when I had a speccy, as I didn't have any development tools at the time. The only machine code I'd previousl…
... grips to the basics of Z80 machine code.
... /[/url]
pactest3.z80 is the emulator snapshot and ... the code, I'm a Z80 newbie, and probably haven' ... enjoyed learning the basics of Z80 machine code, seems like ... above routines, as a bit of fun.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…
... Woodmass)
[*] Fix undocumented flags after BIT n,(IX+d) instructions (Philip ... the reset line on the Z80) and "hard" resets (pulling the ...Z80 Developer ConsoleHi, This is a project I have meaning to do for ages, recently had a kid, had some time off work (as a software developer) and surprisingly had a bit…
... developer) and surprisingly had a bit of time off...
z80... Ive kept tabs on the ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... ]
0018 CHKSYNTAX BIT 7,(FLAGS) Test bit 7 of FLAGS.
001C RET ... - BIT 7, (FLAGS) is not a valid Z80 instruction. You can only BIT a ... a few instances of invalid Z80 instructions. Presumably some assemblers recognise ...Fuse for Mac OS X 0.9.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... Woodmass).
[*] Fix undocumented flags after BIT n,(IX+d) instructions (Philip ... the reset line on the Z80) and "hard" resets (pulling the ... Interface I state information to z80 and szx snapshots (Fredrick Meunier ...SENDING beeper music from Z80 to AY?Hello. According to [url]http://z80.e-demo.pl/[/url] Z80 sends music-data to ULA (the 1-bit transducer). I was wondering if it's possible to send…
... [url]http://z80.e-demo.pl/[/url] Z80 sends music- ... data to ULA (the 1-bit transducer). ... 3 channels digital music. Z80 can send it to ... chiptune/synthetic music from Z80. Is it possible to ... it sound better via 4-bit transducer?
...16-Bit Binary MathsHi, I'm trying to figure a few things out regarding 16-bit maths (SBC HL, ss in particular). regHL is an UInt16 (unsigned 16-bit integer) in my emu…
... an UInt16 (unsigned 16-bit integer) in my emulator. ... H flags. I have them figured out for 8-bit ... using this code for 8-bit maths:
[code] // ... by comparing the sign bit of each passed byte ... would work with 16-bit numbers though. Any suggestions ...
