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RTC module for DIVIDE[IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_top.jpg[/IMG] [IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_bottom.jpg[/IMG] [IMG…
... ;communication with joypad need good timing
IN ... be in log.0)
JR NZ,ERROR
IN ... be in log.0)
JR NZ,ERROR
IN ... -D0 in log.0)
JR NZ,ERROR
; ... -
Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... />
A picture that uses timing techniques to change the border ... to most effects is precise timing. The time each Z80 ... br /> or c ;4T
jr nz,WaitUntilScreen ;12/7T
;10 ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... cannot be reliably replaced with timing routine with no flicker...
23438 RET NZ -
Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…
... LD B,3E ; New timing constant
0xEABA JR NZ,EAAB ; Jump back ... loops done (ROM)
0xEB01 JR NZ,EAFC 12t/7t; Else loop ... ; Edge counter (ROM)
0xEB15 JR NZ,EB08 ; Jump back to L4 ... -
Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... ,(#FF)
inc a
jr nz,.lp2
djnz .lp1
timing fluctuations up to about 12K ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... d
jr nz,.lp1
dec l
jr nz,.lp2
ret ... not a hundred percent there timing-wise. This might be prone ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 0
; this ... />
mainloop:
IF TIMING
ld a, (bdr_colour)
IF TIMING
ld a, 5< ... /> cp WINDOW_BOTTOM+1-8
jr nz, .notoffbotofscreen
ld a, ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... fast the code runs
TIMING EQU 1
; this ... />
mainloop:
IF TIMING
ld a, (bdr_colour)
IF TIMING
ld a, 5< ... /> cp WINDOW_BOTTOM+1-8
jr nz, .notoffbotofscreen
ld a, ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... the code runs
TIMING EQU 0
; ... /> cp 7
jp nz, .carryon; no, so carry ... /> ld l, a
jr nc, .carryon
; this ... br /> or a
jp nz, .notaligned
; if ... ball_vy db 1
IF TIMING
last_frame db 0< ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... the code runs
TIMING EQU 0
; ... /> cp 7
jp nz, .carryon; no, so carry ... /> ld l, a
jr nc, .carryon
; this ... br /> or a
jp nz, .notaligned
; if ... ball_vy db 1
IF TIMING
last_frame db 0< ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... the code runs
TIMING EQU 0
; ... /> cp 7
jp nz, .carryon; no, so carry ... /> ld l, a
jr nc, .carryon
; this ... br /> or a
jp nz, .notaligned
; if ... quitpressed db 0
IF TIMING
last_frame db 0< ... -
Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... br /> RETURN_TO_BASIC EQU 1
TIMING EQU 1
; this points ... br /> bit 1, a
jr nz, .notpressingW
dec b
bit 1, a
jr nz, .notpressingS
inc b
bit 0, a
jr nz, .notpressingA
dec c
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... the code runs
TIMING EQU 0
; ... /> cp 7
jp nz, .carryon; no, so carry ... /> ld l, a
jr nc, .carryon
; this ... br /> or a
jp nz, .notaligned
; if ... quitpressed db 0
IF TIMING
last_frame db 0< ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
main, mainloop, read keyboard and update player
[code]
ORG 32768
main:
IF NOPS_AT_START
nop
nop
nop
nop
ENDIF
IF RETURN_TO_BASIC
ld (stashed_iy), iy
...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
Entry point and main loop
[code]
ORG 32768
main:
IF NOPS_AT_START
nop
nop
nop
nop
; seed rand with whatever is currently in H
; and L set to value in refresh register
Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …
... reached 10?
EA6A 2005 JR NZ,CHANGE ;go on if not ... next digit
EA6F 18F2 JR OVFLOW ;go back for next ...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 …
IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... ]
.org 35000
jr start
;a test ... ,(07Eh)
and 1
jr nz mainloop ;No space, repeat mainloop ...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…
... horizontal
AND 240
JR NZ,up
down:
; ... 5)
CP RECTBOTTOM
JR NZ,up2
LD ... /> CP RECTRIGHT+1
JR NZ,ps2
LD A,RECTLEFT ...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] ; ***********…
... horizontal
AND 240
JR NZ,up
down:
; ... 5)
CP RECTBOTTOM
JR NZ,up2
LD ... /> CP RECTRIGHT+1
JR NZ,ps2
LD A,RECTLEFT ...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 …
... ),A
CP 8
JR NZ,ok1
LD A ... A
CP 23
JR NZ,ok2
LD A,0 ...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 …
... br /> CP 255
JR NZ,prelp
LD ...
CP 8
JR NZ,lp2
LD ... /> CP 22
JR NZ,ok2
LD A, ... +1),A
JP NZ,goa
Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
... br /> dec ixh
jr nz,C2S_1
...
dec ixh
jr nz,C2SC_1
dec ixh
jr nz,lp1
< ...
