-
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?
... -
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…
... 'll multiply by 8" - and another part of the program does indeed divide by 8 by ... -
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…
... ,0
rl e ; multiply by 8
rl d
...
defb 0,48,8,8,8,8,8,48
defb 0 ...
defb 0,60,8,8,8,72,72,48
... 16,16,16,8,8
defb 0,56,8,8,8,8,8,56
defb 0,0,8,0,8,
uglifruit
August 2012
Development
-
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 ... make a copy of those 8 bytes using ldi to ... to lsa left shift those 8 bytes and test bit ... ll then scroll the top 8 lines of attributes. Well ... and left-shifting each byte by 1 to 'get' whether ... -
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..…
... 3A 16 79
8 bytes each
1st byte ... 1 tile minimum values. So multiply by 8 when working out how many ... starting at #6CFC and again 8 bytes each. There is an ... -
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 transfer ... -
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,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ... -
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 …
... ; Based on code by Ian Beardsmore from Your ... add hl, hl ; multiply by 8 to point to first byte ... [from a 2009 WoS thread by joefish]
; ----------------------------------------------------------
push hl ; write 8 bytes from registers
... -
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?
[/ ... from the character and multiply by 8 before adding to the ...
[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 value ... bytes is the same. CHARS by default points to 15616 on ... -
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... Each character's bitmap uses 8 bytes, and the Spectrum ... />
There are 8 scan-lines in a character ... />
add hl, hl ; Multiply by 8
add hl, hl
; Write the 8 bytes of the character bitmap ... br />
ld b, 8
ld a, ... -
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…
...
defb 0,28,8,8,8,8,8,28
defb 0, ...
defb 0,62,8,8,8,8,8,8
defb 0,34, ... 8,8,16,8,8,12
defb 0,8,8,8,8,8,8,8
defb 0,24,8,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…
... you don't have to multiply by 8 (or 9) to find the ...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…
... you don't have to multiply by 8 (or 9) to find the ... ascii code
dup 8
ld a,(de)
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,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ...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,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ... add a,a ; multiply by 8
add a,a ...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 offset ...ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... ..7 instead of RST 0/8/16/24/32
[/quote ... least non-ambiguous (just mentally multiply by 8 if the value is less ... than 8). No idea why you'd ...ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... ..7 instead of RST 0/8/16/24/32
multiply by 8 if the value is less ... than 8). No idea why you'd ...Speeding up PRINT code in ROMHi Folks, I seem to recall that someone stated the PRINT command is rather slow because it has to handle screen and printer printing - is this cor…
... /> add hl, hl ; ... and multiply by 8
add hl, hl
sla a ; Multiply by 8
sla a
... into upper nibble and multiply
rrca ; by 2
rrca ... /> add hl, hl ; and multiply by 32
add hl, hl ...Speeding up PRINT code in ROMHi Folks, I seem to recall that someone stated the PRINT command is rather slow because it has to handle screen and printer printing - is this cor…
... />
[code]
sla a ; Multiply by 8
sla a
sla ...Question on 8-bit, 16-bit, 32-bit...Hello, Sorry, this is probably a really dumb question(and something I should know by now :)). I tried doing some searches about this but came up only…
... (and something I should know by now :)). I tried doing some ... ...
What is exactly meant by 8-bit(as in computers or ... system...in this case being 8 bits wide?
Systems ...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…
...
Basically the routine works by redrawing the tiles that make ... 0,128,64,32,16,8,4,4,2,2,2 ... 64,64,32,32,16,8,4,2,1,0,0 ... 2,2,2,4,4,8,16,32,64,128,0 ... br />
ADD HL,HL ;MULTIPLY BY 2 (2 byte address)
ADD A,A ;MULTIPLY BY 80 TO FIND BLOCK
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…
... This address is calculated by:
; _MB23_tileset + a * 8
... /> ; I have to multiply hl by 8 to find the correct
ld b, 8
._b2a
...Outrun by Sega for the Spectrum +3This is available at ?1 + postage if anyone is interested. It comes as a floppy disk measuring 10 cm by 8 cm. Regards, Mike.
This is available at ?1 + postage if anyone is interested. It comes as a floppy disk measuring 10 cm by 8 cm.
Regards,
Mike.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…
... 40-bit unsigned 32x8 multiply in the main loop. ... the top 8-bits of the 40-bit multiply) then result ... 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 ...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 ... divide y by 8 and multiply by 32,
rlca ; net calculation: multiply by 4.< ... rrca ; only need to divide by 8.
rrca
rrca ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... it's the first one by myself either, but here goes ... (ix),#((_propfont_data - 0x0100))
; Multiply input y by 8
ld a,9 ... /> ; Row loop - do this 8 times (for 8 pixel high chars)
; This could be optimized by reorganizing data to be linear ...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…
... of bits (binary digits) 8 bits long. This means ... length. If you multiply 2 by itself 16 times you ... also notice if you multiply 256 by itself you also ... Compare with decimal where you multiply by 10 each time you need ... need to first divide by 256, write down the ...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…
... .w #3,d0 *multiply the sample value by 8 since each entry
*in the matrix is 8 bytes ...
