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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…
... /> 3.1) Then for 8 bits in the 'pixel', if it's ... ) Repeat 1 to 4 till last speccy display line is done ... bits in a byte array that correspond to the key matrix in the speccy, in ... just pass it the entry in the byte array. Refer to the ... -
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…
... .Z80 format. Two highest bits of last byte in header indicate the type of ... -
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…
... .Z80 format. Two highest bits of last byte in header indicate the type of ... detects the kempston early on in it's initialisation, roughly as ... And will therefore screw up in the manner described when loaded ... kempston support. That bitfield in the Z80 header is an ... -
Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... used from BASIC, err, well, if you know how to check bits in ... a byte (cos I haven't ... you're just returning A in BC) in string B$. The FOR ... -
z88dk stdio fopenI'm trying to write a fcntl library, based on the p3.lib one. Looking at fopen(), it calls freopen_z88() which turns the mode string into mode and f…
... the persistent flag bits in one byte, which saves us a byte in file data ... that ought to be in the low byte with O_RD, etc. ... /> Agreement on the flags being used in both is something that should ... z88dk -- they would still exist in parallel -- but adapting the ... -
DIM DATA and the likeSo...I'm trying to work out arrays in BASIC a bit more and have knocked up the following quick test bed to fiddle about with before trying anything m…
... majority of programs even in Z80 you can do ... xor : Fiddle with the bits in a byte using boolean logic
bits sideways in a byte. There aren't ... multiple adds or subtracts. In fact I don't ... an actual divide anywhere in Finders Keepers, but there ... -
New Game: The Order of MazesI'm pleased to announce my first full game release since Flynn's Adventure in Bombland 4 years ago. It is called The Order of Mazes and you can downl…
... . It could store the maze in 512bytes as each location only ... ,E) but I used the extra bits in a byte for other things like ... be temporary. If I add in things like chests and other ... -
New Game: The Order of MazesI'm pleased to announce my first full game release since Flynn's Adventure in Bombland 4 years ago. It is called The Order of Mazes and you can downl…
... . It could store the maze in 512bytes as each location only ... ,E) but I used the extra bits in a byte for other things like ... be temporary. If I add in things like chests and other ... -
Noob's guide to joysticksWhy on earth would I be asking this *now*, I hear you all scream? The answer... curiosity. Back in the day all I ever had was a +2 and Sinclair's …
... hard to decode the bits in the byte you got back from ... IN 31 using BASIC, since ...
You can do an IN to read half a row ... the keyboard and from the bits work out which keys ... . The Sinclair protocol instead used the two halves of the ... -
IN instruction on emulatorsHi everyone I wrote: 10 PAUSE 0 20 PRINT IN 63486 If i press 1, result is 190 instead of 254 (i used FUSE and Spin) If i press 2, 189 (253) i…
... per half-row, and eight bits in a byte. So, what are the ... marked with an “x”) is used by the Spectrum to read ... read individual bits from a port—only a whole byte, it’s ... reset the unwanted bits in BASIC (it’s trivial in assembly), but the ... -
converting decimal into binaryso like the opposite of the bin function. in basic if possible. it only needs to be an 8 bit number. like a dec$ function?
... their solutions could help you in some way?
bits in a byte
next_bit
ld ... pointer
djnz next_bit ; last bit in byte?
inc ... de ; set byte pointer
dec c ; set byte ... -
Why Hex in place of Denary?Ok - most MC books / tutorials advocate the use of hex instead of denary. But the Speccy doesn't actually have a Hex converter so you need to write …
... will be working with individual bits in a byte; it is easier to ... split the byte down into two lots of four bits - the left ... digit, and the right four bits to the right Hex digit ... -
Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... 're looking at flipping the bits in a byte is that the high ... a subroutine that takes a byte value and:
[code]
SpeedloadersWhen was the first time they came out and who invented them. What was the general speccy user's and media reaction to them? Would be nice to have a …
... for RLE and byte completion if all remaining bits in a byte are 1s ...What connection speeds are you on?Heya - just got curious about something. What connection speed are you on? I know that most ISPs offer "Up To 8Mb/s" (megaBIT), but reality rarely ma…
... out that the download speed in Kbytes is about 1/10 ... figure, as there's 8-bits in a byte, but there is overhead ... account errors... give around 10-bits in a byte. Rough figures, obviously.
Testing the Ram on a Toastrack 128KHi All My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background scr…
... now that check that flipping bits in one byte doesnt affect the proximal ...Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…
... /> It's essential to think in [b]binary[/b] rather than ... certain bits from a byte, or OR-masks to set certain bits in a byte ... whilst leaving other bits unchanged. There are ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... ROM only tests for certain bits in a byte. Hard to explain so ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... ROM only tests for certain bits in a byte. Hard to explain so ...Anybody know of......any racing / car games where you can poke yourself a new track? I'm thinking it could be fun to muck around with Outrun in particular, if it was …
... track is built with 2 bits. In 1 byte you store 4 trackparts ... track
The track in the game is this
In this track these are both ...inverting graphics using basic?just curious if it could be done by poking screen memory ? and what's the structure. (foreground / background for each char ? ) reason I ask is I'd …
... can swap the PAPER/INK bits in the attribute by POKEing ... bit, three PAPER bits, and three INK bits. I don't ... PAPER bits in the byte (mask is 00111000) with the INK bits in the byte (00000111 ... ). This is tricky to do, esp. in ...playing sound samples from Boriel's zxbasic-compilerfirst of all, sorry if it sounds confusing if i'm posting this thread here instead instead of at Discussions:SinclarBasic it's because this is more …
... beat. Using that full byte slows things down.
byte for 0, e = byte for 1
... ) ; a = next eight bits
04 exx
... ld h,8 ; eight bits to output
10 ... 04 dec h ; more bits in this byte?
10 jp nz, ...ZX Spectrum code examplesThe shortage of sites with decent code examples seems to be few. The links to alot of sites that used to host them are disappearing into the ether. …
... pixels because each bit in the byte that you put there ... A screen loads each byte to the next memory ... are represented by the set bits in that byte.
As ... byte loads to a 3rd of the screen it fills in ... the 256th byte loaded will be seen in the second ...Can anyone show a slight diagram of how pokes work in a jet set willy game for example?I know its kind of something to do with machine code and Memory addresses etc but would be nice to see a youtube video or some drawings etc ? .Many t…
... learn are how many bits there are in a byte (8), what a ... maximum number you can store in one byte (an 8-bit number ... to know about the 8 bits in a byte just from the chapter ... you set and clear individual bits in a byte, or shift all the ...I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…
... bytes are made up of bits. Visually in a screen line on ... would expect, however the bits in each byte are displayed right-to-left ... does is finding out the byte (screen address) to write the ... " (remember that visually, the bits in a byte run right-to-left) and ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... ),a ; ensure mismatch in last byte check in first saved byte
; 2327t for repeating last byte saved
... ; 2327t for repeating last byte loaded (first byte pulse only)
...how does this multiplication routine work?taken from chuntey wordpress: imul ld e,d ; HL = H * D ld a,h ; make accumulator first multiplier. ld …
... there are 8 bits in a byte. Essentially for each bit in "H" starting ... it has checked all 8 bits.
Mathematically, its equivalent ...Has anyone tried the last TZX of Basil the Great Mouse Detective?It refuses to work on almost [I]every[/I] emulator I've tried it with: the only one which can run it is EmuZWin. Some time ago there was a long debat…
... about the peculiar loading scheme used by this game - as far ... supposed that the newest TZX file, found in the last update, should be ...
