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Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... a memory address and changes the bits of the byte at that address.
the first byte of the screen display.[/QUOTE]
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... ), you're right that the upper byte of the port address is irrelevant because ... I'm only looking at the ... .
The A register then sets the upper bits of the IN address. Not ...Job Lot of over 160 Items ZX Spectrum[url]http://www.ebay.co.uk/itm/Job-Lot-over-160-Items-ZX-Spectrum-C64-PS1-PS2-PS3-PSP-Xbox-Dreamcast-/161097186089[/url] ZX Spectrum games ATV Si…
... comments
i have used couriers for years and this ... 'd say maybe 60-70% of the bids you will get .. will ... /> to give you an idea of the last Massive lot I bought.. it ... tape that was used and petrol sometimes as the parcel shop isn ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... , the last byte of the packed file must be at least 2 bytes above the last byte of the unpacked ... file. For reverse decompression all the counters count ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... the new value of the low byte
add a,h ; add the low byte to the ... high byte ... it and have fun flipping bits in such a manner that ...People on TV who you never seeAt work today the topic of fictional characters you never see in TV series came about. People like Howard's mum in The Big Bang Theory, who you never…
... but nothing like it used to be and it' ... with what happened right at the end of the last episode.
... [QUOTE=ZnorXman;722601]Think that actor died last ... year (mentioned in one of myriads of RIP threads ...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... , needs HL to point to the last byte):
[code]
... neither work. The first one has the loading of the bytes (inc ... bc, ldi, inc bc) in the ... Backwards just has the disadvantage of putting the ATTRs in place first ...Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... playing any of the new games released for the Spectrum in the last years, ... feel curious to check, the real games start from ... mid page down, as the first ones are mostly ... 't tried out any of the new games yet. Once ... it to check what bits of the code do I'll ...MAME imploding over copyright.MAME (you know the arcade game emulator. That can play 20,000 arcade games and you just try Pac-man on it :) ) well the people at the top want to ch…
... about because they were in the MAME release notes.
the ROM set for the version that was used to make ... and naughty and involves dodgy bits of the internet.Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... -poor implementation of 47loader to go along with the deliberately-poor ... use of the support for blocks with ROM timings to load bits of the game ... a screen in 6912 blocks of one byte, with a counter " ... speed? I was experimenting with the settings in [URL="http:// ...Worst/least effective weapon in a game?Just a bit of fun, like. Mile's 3-way (fnar!) comment in the other thread got me thinking - What's the crappiest weapon ever used in a Speccy game? …
... t big enough. Fortunately the rest of the game is still really ... while they last they have an abysmally low rate of fire ... in very specific bits of the game. And any of the weapons that then ... . Also, badly implemented versions of the [I]Gradius[/I] laser ...New game: PYROMANIA-TRIED BY FIREWell this has been already annouced by R-tape. I posted this just to help people making the 2013 game list [url]http://www.worldofspectrum.org/foru…
... valuable alternative that can be used too (it is more versatile ... nicely multiple UDGs can be used and look (he doesn't ... /> ok I didn't see the exit of the last room.
I ... 'll check Cattivik out and all of ...BrewDog beerI've recently been working my way through the wonderful range of Brewdog beers. Yum yum, shame there's no BrewDog pub near me :( I wonder if anyone…
Has anyone else used one of the Cooper's Australian ... put one on brew last night and something is ... 99.9% sure none of the other brews I did ... double-checked the tin, and yup, definitely the correct kit. ... possible they could have canned the wrong malt.
A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…
... area to prevent the attempted access of inexistent logical drives. ... GBL stores the ?last location? information, both of which have become ... is necessary because the structure of the 16-byte block that GBL ... keeps in the application ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... br />
The lower two bytes of FRAMES are changed using ... the absolute address, ... but every 65536 iterations, IY is used to increase the ... third byte. So there's a real danger of ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... 739298]The lower two bytes of FRAMES are changed using the ... absolute address, but every 65536 iterations, IY is used to increase the ... third byte. So there's a real danger of ... />
Those are the worst kind of bugs to track down ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... br /> Back in the 80's few of us independently spotted ... a block of more that 256 ff's in the original ... and it'll jump to the last byte or ram. You can ... opcode in there and the first byte of rom will act as ... the data and do something ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... is used to increase the third byte. So there's a real danger of ... out of every 65536 updates), only the first byte needs updating. The code above ... all of the above cases.
In the 3-byte update case, the ROM ...IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... keep going until the eventual heat death of the universe. It'll ...
The player is allowed ?16.91 cycles per video byte plus ... be specified. On the other hand, the last sector doesn?t need ... SD cards, where the unused rest of the last sector of every frame must ...Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... 't preserve three bits. It preserves the bottom two bits (worth 1 and ... thought the comment in the code was correct and 3 bits needed to ... confuses me because the dram row address is 7 bits A0 to ... was bit 0 of the high byte not bit 7 of the low byte.
ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…
... assertion. The upshot is that the row address of the second byte pair of the four byte fetch ... snow only change the 7 lower bits of the address (the dynamic memory has a ...How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... pages 127-130 of the Vickers book; the UDG pointer is ... and points to the last byte of RAM which passed the startup memory ... if they're at the top of RAM and more than ... 21 are wanted then the ... to be shifted. The ROM treats the character set as ...How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... pages 127-130 of the Vickers book; the UDG pointer is ... and points to the last byte of RAM which passed the startup memory ... if they're at the top of RAM and more than ... 21 are wanted then the ... to be shifted. The ROM treats the character set as ...Need help with custom loaders againGorski, Lfaria are you still here? :) I have more MIA software saved with Szybka Pamiec Tasmowa loader. This is [B]"Czytaj i pisz po angielsku"[/B] …
... /> As a last note for the curious: the data part for ... 9 bits (the last one is always 1) with the last 'byte' being the checksum ... .
Don't use the ' ... 'educational interest', because the saved data is mostly ...Back in the day when schools had 'a' computer.I stumbled uppon this photo when looking for something completely different on-line. It got me thinking and reminiscing. Do you remember when schools…
... .
Most lessons were used to play !Lander (Zarch demo ... a couple on the internet in the library in the last couple of years there ... memory. Must have been one of the last schools to start using Windows.Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... 3 bits, these mimic the lower 4 bits of the ... attribute address
or 0x58 ; set the high order byte ... to the start of the ...LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …
... copied. Take that byte and add the value of register A to it ... indirectly (the unused bits of the flag register) get 2 bits of info on the byte transfered. might ... work the same as CPI where the flags indicate if the byte is the same ...How did you learn to code on the Spectrum?Got to be honest, as much as I wish I did, I don't know anything about programming. I had a Spectrum (+2 and then +2B) when I was a kid, and my prog…
... that trying to save the effort of becoming fluent in hexadecimal ... tell anything useful about the address 22527 in decimal? ...
Yes, it's the last byte of the screen, before the attrs, :p
the start of the attrs, :) hehehHow did you learn to code on the Spectrum?Got to be honest, as much as I wish I did, I don't know anything about programming. I had a Spectrum (+2 and then +2B) when I was a kid, and my prog…
... ;759795]Yes, it's the last byte of the screen, before the attrs, :p
the start of the attrs, :) heheh[/QUOTE]
JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... data containing the low-byte value of the start byte for the block graphic!! Of course, this ... use the same approach for the sprite handler too - the lower 4 bits refer ... facing (8-way), with the next two bits referring to current animation ...
