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Multiply by 48Is there a 'cheat' to multiply by 48 in Z80? I have a table of sprites 48 bytes each entry, and I want to be able to offset my pointer with a simpl…
Is there a 'cheat' to multiply by 48 in Z80?
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need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... .
Each sprite takes 96 bytes(mask and sprite) and ... to find pixel position and multiply by 96. Then add on the start ... table to do the time 96.
Do all these ... -
Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... br /> Basically the routine works by redrawing the tiles that make ... DEFB 15,112,128,0,96,128,0,0,0, ...
ADD HL,HL ;MULTIPLY BY 2 (2 byte address)
ADD A,A ;MULTIPLY BY 80 TO FIND BLOCK
[ This Message was edited by: dmsmith on 2004-09-26 ... -
GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
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pr_64:
rra ; divide by two with remainder in carry ...
add hl, hl ; multiply by 2
ld d, h ... ; multiply by 4
add hl, de ; multiply by 6
ld de, font - 96 ...
; TEXT VARIABLES
; Used by the 64 column driver
Multiply by 48Is there a 'cheat' to multiply by 48 in Z80? I have a table of sprites 48 bytes each entry, and I want to be able to offset my pointer with a simpl…
... sprites+96
...etc...
[/CODE]
You can also multiply by ...Checksums in Hobeta filesDoes anyone here have any experience with working with the internals of the Hobeta (aka .$b, .$c ...) file format, or failing that, checksum algorith…
Does anyone here have any experience with working with the internals of the Hobeta (aka .$b, .$c ...) file format, or failing that, checksum algorithms in general?
There's a checksum at byte 0x0e, which, according to [url="http://www.nvg.ntnu. ...A bit late, but 10 years of PlayStaion! My thoughts.I think the acual Aniversary of the Playstion release was a couple of weeks ago, but I picked up GamesTM today and it has a big feature about it (bes…
... , It took a while but by 96/97 everyone had one. The ...Overflow Detection while Scanning a Number from a StringI've got some strange behaviour from a subroutine that reads a number from a string and converts it to a 32-bit long. It's C's strtol if it helps to…
... a 40-bit unsigned 32x8 multiply in the main loop. ... of the 40-bit multiply) then result+=digit can ... t cause overflow following this multiply (ie there will be ... base 2, if you multiply by 2^n, you effectively ... max digit after the multiply is also represented in ...assembly optimization: times tenDecimal numbers are not computer friendly :) Anyway, short of saying "sod it - I'll multiply by 8" - and another part of the program does indeed div…
... saying "sod it - I'll multiply by 8" - and another part of ... the program does indeed divide by 8 by bit shifting....
40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... /> rl e ; multiply by 8
rl ... br /> ; CUSTOM 6x8 font -by Uglifruit
;----------------------------------------------------------------------------
uglifont ...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 …
... 32 bytes apart we multiply this by 4 and place our ... y by 8 and multiply by 32,
rlca ; net calculation: multiply by 4.< ... rrca ; only need to divide by 8.
rrca
rrca ...Help for beginner with z80Hi chaps, I'm reasonably new with z80, but had a fair amount of experience with 68000, so decided to give a few things a go. One little thing I'm t…
... ASCII value, take away 32, multiply by 8 (bytes per char) and ... and left-shifting each byte by 1 to 'get' whether I ...Walker (1996)randomly discovered this game in the archive... unfinished, but looks like a ton of work and effort went into it. seems to be linked to Psygnosis …
... games were no longer published by 96 so Im not sure how ...Mighty Maths ProgramsIn a break from typing in listings from 37-year-old magazines, I had a sudden urge to write a maths-related program, as I do, occasionally. Some, suc…
... probably have been snapped up by Sinclair Programs, had I been ... through with the process of "multiply by 16, take the value before ...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…
... in length. If you multiply 2 by itself 16 times you'll ... 'll also notice if you multiply 256 by itself you also get ... /> Compare with decimal where you multiply by 10 each time you need ... you need to first divide by 256, write down the interger ...Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…
... of actual screen data followed by 96 tstates of border, and after ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... comparison and comment:
(by the way, how do ... /> sla a ;multiply by 2
sla a ;multiply by 2
add ... a,l ;increase l by this ... ld a,16 ;increase h by 16 (bottom third)
... it had been increased by 1 (256 decimal) in ...Madness or inaccurate docs: RR r/RL r?According to the Z80 User's Manual, the instruction RR r/RL r should rotate the carry flag into bit 0 or bit 7 of the register in question (bit 0 or …
... register - it's like a multiply by 2)
[*]Uhm, that's ...Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…
... 1 tile minimum values. So multiply by 8 when working out how ...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…
... bytes (they aren't shared by the 8080 and exist in ... clean the possible bits inserted by the carry if you wanted ... wars" game :D.
By the way, I´m creating ... rotation (because I want to multiply by 256, I got this, what ...speed of my Broadband connectionI have done a speed test on my Broadband connection and got a result of 2.5 and 4.2 megabits, the thing is i have just upgraded my connection to 20me…
... manager[/QUOTE]
Ok, multiply by 8 and that's the ...Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…
... /> add a,a ; multiply by 8
add a ... /> add a,a ; multiply by 8
add a ... /> add a,a ; multiply by 8
add a ... /> add a,a ; multiply by 8
add a ...How to convert hex bytes to .. in assembly?I hadn't a clue what to put in the title so..., I have in memory 3 hex bytes #10 #34 #50, e.g.,[code][size=2]#6400 10 , 34 , 50 ; hex 25600 16 , 52 …
... 34 as a decimal and multiply by 6 to get the addition ...How to convert hex bytes to .. in assembly?I hadn't a clue what to put in the title so..., I have in memory 3 hex bytes #10 #34 #50, e.g.,[code][size=2]#6400 10 , 34 , 50 ; hex 25600 16 , 52 …
... +B". You can do that by masking off the lower nibble ... take "A*16" and multiply that by 10/16 to get A ... =rotate right 3 places then multiply by 5. But I think RLD ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... STREAM
; Based on code by Ian Beardsmore from Your Spectrum ... L
add hl, hl ; multiply by 8 to point to first ... [from a 2009 WoS thread by joefish]
; ----------------------------------------------------------
org 60095 ...z80 program to BASIN?I have a BASIC program with UDG:s loaded in a z80 snapshot file. I would like to edit the program with Basin, but I wonder what must be done before…
... same location if not moved by the user?
[/quote ... from the character and multiply by 8 before adding to ...
[quote]
By the way, you said that ... that mean that CHARS by default point to the ... is the same. CHARS by default points to 15616 ...z80 program to BASIN?I have a BASIC program with UDG:s loaded in a z80 snapshot file. I would like to edit the program with Basin, but I wonder what must be done before…
... 65 from the character and multiply by 8 before adding to the ... bytes is the same. CHARS by default points to 15616 on ...Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…
... )
and codecomment says multiply by $04.
I don ... 't know all calculatoritems by heart, but either the comment ...
[B]duration * 51 [/B]by [B]duration / (5/255)[/B ...
