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MEMPTR: Is it worth emulating?Some advice if you will :) The only info I have on MEMPTR is this document here: [url]http://zx.pk.ru/showpost.php?p=43800[/url] I notice SpecEmu h…
... two bits of MEMPTR in bits 5+3 of the flags register after ... of the instruction set sets bits 5+3 by other (now ... -
Which kempston joystick schematic is the best?I'm looking for the best Kempston Joystick interface schematic. It has to be as cheap as possible. But it must be as compatible as possible. I've c…
... and fire1...firexx, all other bits is better set to log ... ,A5=0 can collide with AY or +3 FDD ports or ... /> This basic program can active AY + keyb + joy and data of ... -
rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... missing the first and last bits RL is a 9 bit ... flag and then return the register to its original value. -
rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... need to go up the bits, not start in the middle ... old fashioned and use A register; it does avoid jumps.
rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... 't mind to use other register, you could use most strightforward ... a ; clear carry and working register A
rl l ... just put overflowed bits back to the L register
but ...SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... parallel (e.g. the ALU, register store, etc.) there are many ... my lifetime!
[QUOTE=AY Chip;603067]
Debian debian ...rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... it doesn't use other register (B) to swap nibbles
bits (each register on its own) - we ...Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... sprites, for collision detection.
- AY music via small basic SoundTracker ... possibly about leaving the non-AY machines out in the cold ... , and removing the complicated masking bits just makes it even easier ...BIT/RES/SET b,r where b is variableWhat's the best way to use the bit flag group of commands if it's not known in advance which bit should be referenced; ie. where it's dependent upon …
... /> Probably better to set a register to the bit pattern you ... rotate instructions to move the bits around then as well.
LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... you need those upper 4 bits. Wich you will sooner or ... A.
Only 3 register are free to get rotate ... read upto 32 bits rotates from 40 memory bits, the last byte ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... wiki/Linear_feedback_shift_register]Linear feedback shift register[/url]).
; (Bottom three bits of H will go into ... Input: DE contains 16-bit register to "shift"
; ... Output: DE contains shifted register
LFSR16:
; ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... /> Zero's AY emulation also includes reverse engineered bits from SpecEmu's ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... ]* Zero's AY emulation also includes reverse engineered bits from SpecEmu's ...Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…
... in 5 days? time (24 bits)... eeeeek.[/QUOTE]
Any ... side effects when the I register contains 42...
Also ...I/O port adress map of Spectrum and interfacesI'm looking for an adress map of all the used and unused I/O ports for the ZX-Spectrum. Many years ago I designed an I/O board for the Spectrum that…
... you access your control register say, then on the ... to your data register it latches 8 bits into a buffer ... second it places 8 bits on the low half ... so even accesses store 8 bits, and odd accesses transfer ... 16 bits to the device. Reading ...BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…
... ;623252]still 5 or 6 bits no one uses. Compatibility is ... depends on whether those bits of the register are being used for ...Rare (I think) games listed...Have listed some of my rarer bits on eBay, as i'm needing a little extra cash for a slap up celebratory meal and p**s-up next week (my decree absolut…
[QUOTE=Mark R Jones;626493]Ay? A few weeks ago you ... listed some of my rarer bits on eBay, as i'm ...Question about 2-channel beeper musicI confess I haven't tried all the available beeper utilities and software. I always found music software confusing and trackers are not for me. I kno…
... a way to use the AY in USR 0 mode without ... routine would allow me to select which line to read DATA ...Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
... of 16 colours.
Bits 7 and 6 of each ... index value (0-3) to select one of the four colour ... for INK, 8 for PAPER). Bits 0 to 2 (INK) and ...IND/INDR/INI/INIR/OUTD/OTDR/OUTI/OTIRI'm looking for confirmation that the official Z80 User Guide from Zilog is wrong and that these composite instructions actually change the value of …
... HL register pair are placed on the address bus to select
register C are placed on the ... select the I/O device at one of 256 possible ports. Register ...IND/INDR/INI/INIR/OUTD/OTDR/OUTI/OTIRI'm looking for confirmation that the official Z80 User Guide from Zilog is wrong and that these composite instructions actually change the value of …
... HL register pair are placed on the address bus to select
register C are placed on the ... select the I/O device at one of 256 possible ports. Register ...PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)
... they strip out the ugly bits to make it pure though ... /tape convertor where you can select a section of WAV sample ...Fusetest port 0x7FFD test resultsHi, I'm adding the Spectrum 128K emulation to my FPGA core running on the V6Z80p platform. I'm doing some tests; running Fusetest, the machine is se…
... written 0xff to the paging register, probably from the floating bus ... /read, I'm LATCHING the bits from 0 to 4 (so ... words, I update all the bits 0,1,2,3,4 ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... 8 bit in the A register:
[/QUOTE]
Patrik ... only retaining the bottom 15 bits may also reduce the quality ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... paper, increasing state to 32-bits?[/QUOTE]
... This gives me 32 bits of context. I create ... ,c) triples, and select those triples which have the ... on successive bits implies good statistics on bits separated by ... tuples of the successive bits to make sure ...AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
... true only for YM2149, not AY, IIRC.
Tone ... />
Interesting, because the Mame AY code says this:
AY-3-8910 and YM2149 chips ... three shifts of the */
/* register, what now is bit3 will ...AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
... be a 16 bit shift register with an input (bit 16 ... it wrong - it's 17 bits all together. Your last value ...FeedbackI've noticed a lack of a thread to share feedback regarding purchases or trades.. Macc - I brought four games and some parts from him to help with m…
... 57d3 from Velesoft
Stereo AY kit from BVerstee
Keyboard ... (and a DivIDE+ and other bits in the past) from RWAP ...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 …
... version for the final 16 bits.
[code]
bits
writelp:
bits
... is more economical in register use which makes it ...Help needed... RND in machine codeI have been battling away trying to convert a simple BASIC routine (below) to machine code, but to no avail. The routine is used to fire 2 bullets a…
... . For example, the lower 3 bits of the one from z80bits ... an array of items to select from which shuffle on each ...
