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New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... attribute from the shadow screen combined with the pixels ... from the normal screen.
... reason on +3 the screen flip happening between pixels ... pixels from the same screen as the attribute. ... +3 ULA prepares the screen address on the bus. But ... -
FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…
... pattern is generated from the screen address.
The OR/XOR ... -
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 …
... back with
HL=RAM-address of this pixel and
screen address and have it give me ... -
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 …
... url]
Every screen address, attribute address, character and pixel coordinate manipulation ... view=markup"]asm_zx_saddr2px.asm[/URL] (screen address to pixel x)
[ ... asm[/URL] (screen address to pixel y)
The screen address does not ... -
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 …
... like this....for a given screen pixel coord of x,y ... is the top of the screen, the binary representation can be ... etc.
then the address of that pixel is:-
screen address...it was a pile of ... -
byte to screen eventI have another question regarding assembly routine in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F LD DE,3F08 0608 LD B,08…
... 'HL' registers that indirectly address the screen location are passed the 'A ... />
HL points to the screen address directly and DE points directly ... plenty of discussion about the screen and its layout. -
Column and row numbers to attr address?[FONT=Calibri][SIZE=3]Can anyone provide me with a code snippet the will convert the column and row numbers into the screen attribute address. For ex…
Every screen address and attribute address calculation you can think of ... , uchar col)
;
; Attribute address of character square at row ...
;
; exit : hl = attribute address corresponding to character
;
Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... memory into its own screen buffer and generates a ... -read from an alternative address, so that it could ... reads to the ROM address space, and treat them ... able to place its screen address at least on any ... the ROM and lower 16K address spaces. (That the ROM ...HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …
... of ULA+, less so). Screen paging is desirable, but this ... control bit to decide which screen to display.
... over the $4000-$7FFF normal screen address range, so that the developer ... the 128K that controls which screen is displayed.
...UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…
... over UDGs is that SCREEN$ will recgonise your redefined ... " then poking the start address of the UDGs one byte ... the screen, you need to work out the address of ... the top byte on screen, then copy ... add 256 to the screen address and 1 to the UDG ...Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... />
To get a screen address of a character it's ... a table of the address of each character row. ... HL again to swap that screen address back to DE.
... now have the start address of your chosen character's ... much easier as the address is just 22528 plus ...Demo of multidirectional scroll 50fpsHello!!! Im working with scrolls, and I want to show you a demo of a posible game. It works at 50fps and can manage about 7 sprites in the screen w…
... of fixed blocks across the screen and what could be passing ... to grass. You treat each screen block as a mini-animation ... into each position on the screen.
You can use ... just raise and lower the screen address you're writing to.
Demo of multidirectional scroll 50fpsHello!!! Im working with scrolls, and I want to show you a demo of a posible game. It works at 50fps and can manage about 7 sprites in the screen w…
... of fixed blocks across the screen and what could be passing ... to grass. You treat each screen block as a mini-animation ... into each position on the screen.
You can use ... just raise and lower the screen address you're writing to.
Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…
... then saying the Spectrum's screen memory layout gave it an ... to try and calculate a screen address.
As for criticising ...Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…
... then saying the Spectrum's screen memory layout gave it an ... to try and calculate a screen address.[/quote]
The critical ... difference is that the Spectrum screen is directly addressable, and the ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... of calculating the pixel address for a character square ... uchar col)
;
; Screen address of top pixel row of ... br /> ;
; exit : hl = screen address corresponding to the top
screen address by moving one pixel ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... of calculating the pixel address for a character square ... br /> ;OUTPUT: HL = address of character in screen
ld ... will be modifying the current screen address by moving one pixel ... afair, does calculate the pixel address for every pixel plotted in ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... line of data to the screen will be much slower as ... ; ldi incs l so next screen address I 7 (8-1)
Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... [/SIZE][/I], with its own address and data bus, and free ... to read an attribute from screen RAM. The datasheet states that ... /> As for the C64's screen layout, it makes a lot ... pixel co-ordinates into a screen address though.Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... quicker for calculating the Y screen address ( I think 6 instructions shorter ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... quicker for calculating the Y screen address ( I think 6 instructions shorter ... a table for screen row addresses so both screen types would be ... did have a character-arranged screen, and you wanted to scroll ... do it with the Speccy screen as-is too, by using ...Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... with HL pointing at screen address;modified from a Jonathan ... d give segment start address.
ld h ... ; squares 0 - 31 across screen.
add a,l ... ld l,a ; HL = address of screen.
ret
;[/CODE ...Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... with HL pointing at screen address;modified from a Jonathan ... d give segment start address.
ld h ... ; squares 0 - 31 across screen.
add a,l ... ld l,a ; HL = address of screen.
ret
;
Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... with HL pointing at screen address;modified from a Jonathan ... d give segment start address.
ld h ... ; squares 0 - 31 across screen.
add a,l ... ld l,a ; HL = address of screen.
ret
;
Horace you smooth mover!Just wondered, was Horace the first character to move smoothly around the screen - rather than in a blocky, character space by character space fashio…
... by timing the move between screen refreshes and ensuring that each ... a specific calculation of the screen address.
[QUOTE=mickmog;812917 ...Any Examples of player controlled masked sprite over flip screen tilemapped rooms?Please does anyone kindly have any z80 code examples of a flip screens tile map with a masked character sprite that you can control via keyboard, ie …
... wide at any place of screen
; DE -graphics source, HL ... /> INC L ;go right on screen
LD A,(DE ... /> OnePixelLineDown
;requires HL as screen address
INC H ;go to ... we are in the same screen segment
RET
[/CODE ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... a double height string at address (HL) from attr and
Address from screen address
AND $F8 ; %11111000 ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... have to use an absolute screen address, could be changed though ... de ;save screen address
call print_tall_char
pop de ;screen address
... font, insert your own font address here
add ... addressed by HL at screen address DE over 16 lines< ...Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…
... move mouse pointer over Spectrum screen, the emulator could show (as ... of pointed pixel and memory address for the relevant byte.
screen address/data display, ALT+F10 to ... toggle the 16-pixel screen grid. Download Speccy 3.7 ...Buddy 0.1 demo[url="http://wischner.co.uk/downloads/app.tap"]The tape is here[/url]. Load it, then enable kempston mouse emulation, then reload it. [url="https://g…
... could be performed against the screen address and the bitmap being written ...
