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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…
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... not been confirmed) put random bytes onto the data bus at ... a table of 257 identical bytes at 256 * I and use ... a table of 257 0xff bytes and place 0x18 (JR) at ... . However, hardware devices placing random bytes onto the data bus means ...ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …
... if the ULA is reading bytes it does so each 4 ...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 …
... realtime, it just uses preshifted bytes table (4 kbytes
bytes for left and right ... a table with all bytes preshifted to all steps ... suitable part of preshifted bytes table to use in ... stored in BC' preshifted bytes of mask and sprite ...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…
... ; Increase H, thus moving 256 bytes forward in memory to FB0Ah ... screenaddress
; 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] ; ***********…
... ; Increase H, thus moving 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 ... />
; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ... ,0E0H
; 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 ... />
; SCREENTABLE
; HI BYTES OF SCREEN
ORG 0FB00H ... ,0E0H
; LO BYTES OF SCREEN
ORG 0FC00H ...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. ...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…
... chars and takes up 320 bytes.
* Tiles are pre-shifted ... starting at
* 40960. Two bytes are used for each tile ...The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
... could be smaller than 37 bytes.
[url="http://www ... and it is now 36 bytes,
(34 if loaded on ...SPIN - debugger / fill memory / how ?I try to fill the screen with 00 value, but I don't get the expected result. - pause the game - debugger - hex numbers - fill memory block - fill wi…
Star Tip 2 - Tim Follin's 3 Channel Sound - info reqd.Hello there, I've decided to throw myself in at the deep end and decipher Tim Follin's "Star Tip 2", which produced some incredible 3 channel sound …
... in 4 groups of 3 bytes starting at #9D68.
Prior ... a group of 6 "control" bytes (I know they're control ... bytes because they start with #FF - ... know what the other 4 bytes do?
Has anybody stayed ...Help needed with drawing masked spriteI need to draw a small sprite (16 bytes) on to the screen using a mask. Its the only sprite that will be used so speed isn't too important. I was goi…
... draw a small sprite (16 bytes) on to the screen using ...Can anyone help?Got a bit of a recurrent problem here when it comes to duplicating the Cronosoft tapes, i was wondering if anyone can help. I'm getting loads of ret…
... bug in the last few bytes of programs saved greater than ...Trying to make my first TZX, but it won't run..Hey :) I've finally got around to start imaging some tapes here, but unfortunately I ran into problems right away, bah. I'm trying to dump "Ace Low…
... (VOC) v1.10 EXT, 7321889 bytes (7320064 samples)
■ Sampling rate ...Secret Diary of Adrian MoleHelp me! I downloade this game and it gives you the Mosaic loading screen then just goes into a screen where it says "Bytes: game" at the end, and th…
... a screen where it says "Bytes: game" at the end, and ...OT : Probs with XP useraccount from a diff. HD. SOLVEDOk ... I have a new computer and I took out the HD from my old computer and installed it on the new one. I had a username/pw when I logged on the ol…
... " and the folder has 0 bytes in it. I have all ...My New Game - Need Graphics HelpHello All, I am working on a new game, which I hope Cronosoft will publish called "Bipboy" You can load a demo here [url="http://www.peargames.co.…
... some landscape block graphics (2 bytes * 16) and some enemies (3 ... bytes * 16), you will of course ...The SPIN AssemblerI am using the assembler in Spin but I am having a problem with "DEFS". I was hoping that it would allocate a section of memory but it doesn't seem t…
... DEFS is not reserving 8 bytes. Can anyone help ? Also, is ...Wanted - A loving new homeThanks to an imminent house move, it's time to dispose of some of my excess Spectrum tapes. I'd like to donate these to the Preservation project to u…
Map to screen address problemCan anyone help me out with what I guess is a screen address calculation problem. I need to calculate the screen address of a tile based on a number…
... 143. Each tile is 2 bytes wide by 16 pixels high ...plus3dos headersThe plus 3 manual states that bytes 15...22 contain +3 BASIC header data. Which on the whole seems to be true, however I've never seen bit 22 being a…
... plus 3 manual states that bytes 15...22 contain +3 BASIC ... being anything other than 0. Bytes 23...126 are reserved and ... related point: in TAP files, bytes 0 & 1 contain the ...saving to asmMy another question... I know I can save part of Spectrum memory to .bin file. However I would like to save it (or convert .bin file)into .txt file w…
... .txt file where instead of bytes i would have have lines ...Tap file creation, parity error.Hi, I didn't know where to post this question so I've put it here :) I'm writing a program to convert an ascii file into a Spectrum .tap file (yes,…
... the bitwise XOR of the bytes of the datablock, though I ...An interesting press release.FOR IMMEDIATE RELEASE So you want to be a record breaker? London, UK ? Jun 02 2005 ? From the ZX81 to the PSP, gamers of all ages and formats are i…
... />
About Retro Bytes PR
Retro Bytes PR works with a ...Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
The score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the table. Has anyone tackled a problem like this before ?
