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RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... chan_4 ; could write the bytes directly but
; ... streams has
; two bytes of offset data
... ; the total number of bytes occupied,
; held ... ; -------------------
;
; 384 bytes
font:
defb ... -
It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... . Doing it this way does two things: it means I trap ... (i.e. decode CALL plus two bytes). This is more complex, but ... -
disassembling raw images of ROMs.Pip pip. I'm wanting to disassemble a few ROMs. I have the raw file, a dump, but I'm looking for a way to take every two bytes and print them not in …
Pip pip.
I'm wanting to disassemble a few ROMs. I have the raw file, a dump, but I'm looking for a way to take every two bytes and print them not in hex, but in octal.
Does anyone know of an easy way to do this? -
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…
... /> // If we are adding the two bytes we have an overflow if ... sign bits of the 3 bytes (if 0 then the sign ... -
128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... />
ex de, hl ; skip two bytes
inc hl ; to create ... -
Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…
... named _MB23_grid) which contains two bytes per character (character ... /*
MOJON BLOCKS 23 (Two thirds)
============================
*/
bytes (1 cell is 1 ... ; And just draw 8 bytes to the screen:
... -
How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... this is simple:
Two bytes are the address.
One ... />
Now let me pose two questions to the other enthusiasts ... -
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…
... Spectrum Manual.
Some instruction bytes, like 201 for 'ret', ... br /> Some instruction bytes need one or two bytes of data afterwards for ... do.
Some instruction bytes need a further instruction byte ... /> In our case the two data bytes will be 0,0. So ... -
Full Screen Editor/AssemblerIMHO program [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0008187"]Full Screen Editor/Assembler[/URL] should have a "known errors" note as …
... [/URL]:
The last two bytes of the [B]BIT b ... -
CrusoePlease add the following "known errors" description for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0002872"]Crusoe[/URL]: [QUOTE]Bu…
... to JPs being one or two bytes off their correct destination. The ... -
stuck on recursive functionI want this function to PEEK 'l' bytes from memory starting at 's' and return them as a string, but however much I fiddle about with quoting and pare…
I want this function to PEEK 'l' bytes from memory starting at 's ... FN j$(s,l)=CHR$ PEEK (s)+VAL$ "FN j$(s ... -
BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern: pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1 See [url]http://scratchpad.wiki…
... />
But the instruction is two bytes and the ufficial z80 manual ... -
Any ideas on speeding up this assembler segment?It copies a pixel column of a rectangle which may be anywhere in the display file to a pixel column in d$. The source column may start at any bit pos…
... within one byte or span two bytes.
[code]
for_d: push ... -
Renegade:Attack of the Clones :)I have been examining the code of Renegade recently as I really like this game and would like to know how it is done. Look what I have discovered : …
... />
Quite funny how only two bytes can change the entire game ... -
Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... stored as 256x8 bytes, or 8x256 bytes (i.e. 8 bytes at a ... also, if you prefer, store two bytes per character to give a ... you can hit one- or two-frame redraws, or can raster ... -
TAPlist - the emulator versionI've got this working reasonably well; there's just a couple of small extra features which I want to add. (Recall that TAPlist writes a formatted lis…
... and one at the end, two bytes being the TAP block length ... -
Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... , instead of the CPU requesting bytes via IN instructions then writing ... takes 11 T-states per two bytes.
With DMA using the ... to 6 T-states per two bytes.
* Memory to memory ... can transfer more than 256 bytes at a time (the limit ... -
64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... having a simple 64x48 bytes buffer, 1 byte per ... is wasting memory (3072 bytes for a 64x48 monochrome ... is simple: for every two bytes in the buffer, which ... represent two adjacent pixels, I calculate ... adjacent lines. For example, bytes 1, 0 in the ... -
What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…
... ' itself
System variables (two bytes maybe) to change the tape ... -
Curious feature of tape loader for Pssst!Hi everyone, I have a copy of the Ultimate game Pssst! on tape, which I decided to copy to 3-inch disk so I could load onto my +3 quickly, and so …
... is loaded into the lower two bytes of FRAMES (the file in ... -
Fighting Warrior's protection systemThis is one of those bizarre cases where cracking the loading system is orders of magnitude more fun than playing the game. (Indeed, discovering I wa…
... screen is loaded by reading two bytes off tape for a screen ... address, then 8 bytes for that cell followed by ... screen is loaded, the remaining bytes on the tape self-modify ... -
How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... ) 8 bits long. This means bytes can store numbers up to ... upto 255. Double registers are two bytes in size and give an ... the Z80 works in single bytes. So when we need to ... -
PAW questionThis may not be the right place but anyways there it goes: I've been trying to figure out how to import graphic files in .SCR format in the PAW parse…
... start the adventure. The next two bytes are poked with the values ... -
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…
... perform mathmatical operations and return bytes to be inserted into the ... it is a string of bytes).
+ addition - subtraction / division ... -
ANNOUNCE: Fuse 0.6.0 for Mac OS XHot on the heels of the UNIX release of Fuse 0.6.0, the native Mac OS X port is now released. It has all the great features of Fuse 0.6.0 plus: * Wa…
... a simple comparison of the bytes read. At least one of ... the bytes must be different else nasty ... command says that there's two bytes in the Results phase - ST0 ... -
Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…
...
The Z80 has two kinds of interrupts: NMI (non ... in the first 256 bytes of memory. This is ... 16-bit address). The two bytes stored at this address are ... by 'I' (or just two bytes if we know only ID ... vector table is 257 bytes long and occupies addresses ... -
Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…
... />
ld l,h ; middle two bytes
ld h,e ; are ...
volume_lookup_low: or 0xc0 ; low two bits of pointer to volume ...
