-
Efficient comparision of several valuesHi all Let's say we have an array of six values, like {2,1,1,1,3,2} Using BASIC or ASM, what's the most efficient way to find 3 consecutive posi…
... at the top of a 256-byte page (I.e. the last ... -
A table of AY frequenciesHi friends, Simple request I hope; does anyone have source for a table of note frequencies on the AY chip as used in the Spectrum 128? I had a loo…
Thanks for that, this looks like what I need! The info on the other thread was interesting too, I didn't previously understand why there wasn't just one table for all cases. -
Backpackers guide to the universe part 1 copy protectionTried it with real 48k and real 128k toastrack and also with emulator (fuse on osx) with hardware set on 128k or 48k. On 128k machines the copy pr…
... ) to form a lookup table for the codes in the code ... the entered code with the table, the result won’t match ... -
Someone knows the size limit of TAP files , TZX on emulators and real spectrum for saving blocks ?Hi Someone knows the size limit of TAP files , TZX on emulators and real spectrum for saving blocks ? The limit is the number of blocks or si…
... "]Spin is no longer developed for a long time, and the ... same rather than a byte size limit for the file itself.
for my own stuff and friends ... 's or C60's iirc for their erm 'collection' , I was ... -
Shrinky challengeInspired by this contest on c64: http://nurpax.github.io/posts/2019-08-18-dirty-tricks-6502-programmers-use.html Make the smallest possible .tap t…
... do a, let's say, 256 byte demo then i just count ... the 256 bytes of machine code - not ... -
PAPER&INK: screen/character differenciation?So I was looking at a type-in listing earlier and I got to wondering how the Spectrum differenciates between knowing that the PAPER/INK commands need…
... /flash colours.
23624 , X for the border (lower screen two ... of the first attr byte. The reasoning for moving the print down ... bit and choosing a colour for it is simply incase you ... see the 'number' INK9 merely for constrast so you don't ... -
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... they do not cross a 256 byte page boundary we want to ... just the low byte. Increasing just the low byte is quicker (4 ... -
Corona Virus,Is is me or is the BBC sensationalizing this corona virus too much and creating hysteria?
I'll brush your periodic table for.... Um, too far? -
IM2 on a 128k SpectrumHello: I have found another article on IM2 found in Personal Computer News, Issue 90. In the article "Face up to the Time", I typed up the code (…
... you are missing the 257 byte interrupt table.
EDIT: But ... -
IM2 on a 128k SpectrumHello: I have found another article on IM2 found in Personal Computer News, Issue 90. In the article "Face up to the Time", I typed up the code (…
... addresses that contain your 257 byte vector table and the address the ... table points to must always be ... -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
... , but very slow compared to byte mirror table.
I've ... routine above to build the table. It's as concise as ... /> org $8000
ld hl, table
ld b, 0
org $c000
table:
[/code] -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
To get the mirrored byte using the table is just 21 t- ... /> ld h, $c0 ; hi-byte of table
ld a, (hl) ; ... a now holds mirrored byte
[/ ... forums/discussion/comment/973421/#Comment_973421]table builder above[/url], from 59 ... -
If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…
... 'll probably use drive 0 for storing system and management software ... receive and buffer a byte without waiting for the start bit. Additional ... -
Relocation in z88dk or sdccHi, I've been trying to find any information about the current efforts surrounding runtime relocation capability of z88dk and sdcc compilers. There…
... at anything other than a 256 byte boundary. There's no target ... knowing where the high byte and low byte relocations need to go ... -
Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…
... [list][*]The various 16k byte RAM packs for the ZX81 (mainly because ... t remember any memory expansions for the other ZX Spectrum ... manufacturer has to arrange for these vital bits of ... microdrives, a Sinclair standard for disk drives would have helped ... -
Weird dreams threadI remember some of the dreams I've had over the years. I wonder if I'm the only one who has strange dreams like this... Days ago: I was dreaming t…
... cover my face with the table blanket. He gave me the ... phone and I waited for the other guy to pick ... four digit number on the table for me to slowly spell out ... -
"Of It's Time" : Rooted in the 1980's ZX Spectrum Software (aka Culturally "Out of Date" stuff) This does not have to be UK based but it has to be ZX Spectrum software that is culturally specific to or at least strongly related to the 1980s . …
... /> Perhaps a "Walking to your table for dinner without touching anyone" simulator ... "Stay in a quarantine hotel for many days without a chance ... -
Strongest aspect of Spectrum BASICWhat would you say is the strongest aspect of Spectrum BASIC compared to other BASICs on other micros at the time. I think it might have been the Fun…
... .io/A-fast-circle-algorithm-for-ZX-Spectrum/ and is surprised ... you can afford a lookup table for your PLOT and you don ... different parameters.
(Sorry for rant).
PS. What ... -
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…
... less than a multiple of 256. The routines to clear the ... since they start at a 256 byte boundary.
EDIT2: You ... a time starting on a 256 byte boundary (so you can use ... -
Sort 2 byte words (x, y) on ypos, also question about swap (DE), (HL)Well that was a lot of debugging ;) But if you want a routine which takes an array of 16 byte words x, y and then sort them on y (ignoring x), I'm…
... , * rr = to - 1;
for (;;) {
/* find left most with ... main()
{
uint16_t data[256];
cout -
What's everyone drinking?Since it's the weekend, i assume a lot of Wossers will be enjoying a drink or two. I'm enjoying a nice bottle of Miller. What's everyone drinking t…
I was in a shop yesterday for a nice cold drink and noticed they sold Lilt, i thought that went out of circulation years ago. I settled for Sprite. Nice summer drink. -
Text compression methodsI once typed in a Text compressor from INPUT magazine, it worked on a first and second most common following letters algorythm and reduced the binary…
None of those algorithms (searching for longest substrings within strings) are ... the uncompressed data in a table for each index).
EDIT ... -
Dan Dare 256 colour project many may not be aware of.I still need/want to try Vladimir's emulator. But I think many people here aren't aware of another 256 colour project, which was mentioned on C.S.S. …
... aren't aware of another 256 colour project, which was ... be in the mood for an afternoon's pixel ... I've agreed temporary hosting for about a week on the ... br /> data as a palette table and you pretty much have ... the game palette - 129*256*3 bytes, indexed as:
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 …
... #DEFINE DEFB .BYTE
#DEFINE ... TABLE WITH
LD BC,0FDH ;253*256 ... /> ; MERGE SPRITE COLOR WITH EXISTING ... No attributes
;Mask: Yes, mask before
FOR IM2 INTERRUPTS
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... write all your
sprite and text routines to print ... /> ld a, 0x3b ; high byte of vector table
ld i, a ... 16384 + 6144 - (line * 16) - (cell * 256) - (row * 32) - (chunk * 2048)
for everything except rainbow processing, ...
