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Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …
... with a block larger than 256 bytes?
Q6) Why won ... you can only adress 256 blocks of 256 bytes (=64 K) ?
Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
... DE
INC H ; *256 to get next line
INC H ; *256 to get next line
256 bytes forward in memory to FB0Ah ... />
; Low Bytes of screen
ORG 0FA00h ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
...
INC H ; *256 to get next line
INC H ; *256 to get next line
256 bytes forward in memory to FB0Ah ... />
; Low Bytes of screen
ORG 0FA00h ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH ...
INC H ; *256 TO GET NEXT LINE
; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ...
; LO BYTES OF SCREEN
ORG 0FC00H ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... INCREASE H, THUS MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH ...
INC H ; *256 TO GET NEXT LINE
; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ...
; LO BYTES OF SCREEN
ORG 0FC00H ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... ld bc,32 ;number of bytes per line
ldir ;draw ...
IncY:
inc d ;256 bytes below (next line for this ... ld bc,768 ;Num of bytes
ld hl,ATTRIBUTES
Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
... : if you will read 512 bytes sector from IDE device to ... />
Example of slow read 256 bytes:
LD C,ide_dataport
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... fast (for buffers smaller than 256 bytes) since OTIR/INIR take the ...How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …
... first character ('Space') then lies 256 bytes beyond that. Each character then ... a series that follows 8 bytes after.
[B]My ...MGT image format and file systemHello, I'm working now on the M.G.T. file support for my ZX-Modules applications. I've collected some data sheets and most of them describe the inte…
... per side and use 512 bytes per sector, so we get ... an amount of 819200 total bytes for the image. The directory ... 2 directory entries per sector (256 bytes = 1 directory entry).
But ...Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …
... />
LD HL,23296 ;fill 256 bytes with value 255
LD ...
LD HL,77*256+237
LD ... code is stored at (I*256+N) (N: random value 0 ... will be at address 255*256+255 = 65535
;the next ...JetSet Willy - Mirrored UniverseHello All, Thought you guys might be interested in what I've been doing the last week or so. Using the following documentation: [list] [*][url=htt…
... Title Screen data by about 256 bytes (no harm done). The compiled ...Store and restore attribute valuesI am needing ideas on how to write a machine code routine that will store/restore (more important to restore) attribute values to the 22528 area. I …
... 16,16 area of screen, 256 bytes I think?!
I ...Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... ) - ie. two tables of 256 bytes each placed on the start ... rrca
ld h,SCRTABLE/256
add a,(hl)
ld h,SCRTABLE/256
add a,(hl)
bytes on a table might earn ...TRDCUT for WindowsI see only old DOS version of TRDCUT utility on WOS: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/tools/pc/trdos/TRDCUT11.zip[/url] Exist any new…
... filesize will always multiple of 256 bytes (TRD image with all used ...Manic Miner - Loader And Screen DifferencesThere are some changes between the various releases and re-releases of Manic Miner with both the loader and the loading screen itself. Here I'll deta…
... attributes with this version, ie 256 bytes starting at 22784. Shown on ... pic is a full 768 bytes starting at 22528
256 bytes starting at 22784
256 bytes again. The game code uses ...Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... . As the high bytes of the 3 screen ... positions which are 32 bytes apart, so to ... character lines are 32 bytes apart we multiply this ... divided into pixel lines 256 bytes apart, so we again ... /> ld d,a ; line * 256.
[B]; ...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 ... 11 T-states per two bytes.
With DMA using the ... 6 T-states per two bytes.
* Memory to memory ... DMA can transfer more than 256 bytes at a time (the limit ...Mr. Jido makes some noiseA little something to analyse and discuss for you. [code] ORG 60000 ; RND Generator: RND LD HL,EARTH LD A,(WIND) ADD A,L LD …
... /> PLANT LD (HL),B ;Fill 256 Bytes
INC HL ;with everything ... LD B,0 ;throw away 256 things
DESTROY PUSH BC ... /> RET
EARTH EQU 256*250 ;64000, keep value aligned ... to 256!
WIND DB 0
what is tr-dos ?well you saw the topic [img]/__forums/images/smiles/icon_smile.gif[/img]
... 2544 sectors, each sector is 256 bytes. There are 160 tracks (159 ...games written using game writng programsI was reading through some issues of crash not long back and one article was about some 16 year old that wrote Frank n stein for the speccy(never pla…
... desired. I now have four bytes to spare, unless I lock ... 48K mode and use the 256 bytes in the printer buffer.
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…
... different byte in the first 256 bytes of a 512 byte sector ...Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…
... + decoding tree (for 256 elements) into only 400 bytes ?!
[/quote]
256 bytes to completely construct a decoder ... 't be more than 150 bytes, at a guess. An 8 ... can tolerate more error the 256 byte table can be shrunk ...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…
... entry points in the first 256 bytes of memory. This is not ... 16-bit address). The two bytes stored at this address are ... service routine at I*256+255,I*256+256. So the Spectrum needs ... interrupt vector table is 257 bytes long and occupies addresses 0xf000 ...help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …
... any competition there - you loose 256 bytes in a table but you ... to mirror you can sacrafice 256 bytes which is a lot less ...help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …
need a Table of 256 bytes stored on a 256byte boundary
on entry: a=byte to mirror
FlipByte:
ld h,TableAdress/256
ld l,a
ld a,(hl)
ret
