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Joffa speaks... sort of.I was looking through my archives today to search for some images, and found this psydo-interview I done with a certain Jonathan Smith. It reads as f…
... Buzzsaw back in time to May of 1997 and successfully sue Joffa ... -
Joffa speaks... sort of.I was looking through my archives today to search for some images, and found this psydo-interview I done with a certain Jonathan Smith. It reads as f…
... of Buzzsaw back to May of 1997 and successfully sue Joffa for ... -
Jonathan Cauldwell writes.I also found this in me old archives, which was actually written by Jonathan Cauldwell. Again, typos and editorial tags included for authenticity ;-)…
... it has drawn, then jumping back to the beginning of the ... have been drawn and jumping back to the start of a ... are considered. Even when every byte is used, there is still ... -
Spectrum +3 suspected memory faultHi, I've been using my +3 for the first time in a while and found that some games have problems with the display becoming corrupted and sometimes cr…
Correct. It might touch every byte of RAM, but I don' ... it gets the same value back. I don't think it ... we get the same value back" test won't, for example ... -
What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…
... from hex to binary and back again in your head, ... char
inc hl ; next byte
jr .loop
... make you return when the byte you just fetched from ... . AND A requires 1 byte and takes 4 T-states ... , XOR A takes 1 byte and 4 T-states, instead ... -
What's on your saucer?Thanks go out to frobush and zx1 for inspiring* this WoSser to create a yet another excellent WoS thread. Lunch 10 minutes ago. [IMG]http://i300.ph…
... recorded it! And got emailed back!
I'll listen ... back and upload! Probably nothing.
< ... />
From: Jonathan Smith [mailto:joffa.smifff@tiscali.co.uk]
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... been doing something similar (investigating back buffers).
None ... Draw graphics to back buffer. I keep a 96 byte buffer (1 ... need updating (copying from back buffer to front buffer).
back buffer to screen I use a 256 byte buffer ...Skooldaze TooDear WoSsers, Thanks to Skoolkid's disassembly I'm attempting to write a new "improved" version called [B]Skooldaze Too[/B]. As part of the improvem…
... catapult, punch or jump in Back 2 Skool there are no ... originally imported Hayley by hand, byte-by-byte in notepad! Miss Take ..."I assumed it was converted" threadI was surprised to see that speedball was never put out on speccy.. and maybe it could be done using the engine outta microprose soccer.. what titl…
... out on.
Parallax. - Joffa's Firefly engine could've ... the crummy sequel Thing Bounces Back.
Creatures 1 and 2 ...some games for sale[URL="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270514833669"]180 and Sweevo's World[/URL] [URL="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?V…
...
Grange Hill by Bug Byte
Gregory Loses His Clock ... -release
The Empire Fights Back by Mastertronic
Turbo Esprit ...reimport of exported asm in 7upI know it may seem a cryptic title but is there a way of importing an asm file ( created using the export data option within 7up) back into 7up or an…
... export data option within 7up) back into 7up or any other ... "Sprite" in Interleave. "As 9th byte" is now "Gfx+Attr" in ...Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
... (HL), A to set a byte, you have to send an ... you need to modify a byte, you have to copy the ... , and write the whole lot back. Obviously if the process crashes ... sector/modify in RAM/write back is easily hidden by a ...The Making Of Manic Miner"Matthew Smith talks us through every level of his classic platformer Sat at the very desk where it was written, Matthew Smith watches Miner Willy l…
... : level data
6E03: last byte of level data
A000: Back buffer
B800: Back attribute buffer, has attributes ...Character scrollingOk, first I'd like to say that I'm not looking for a complete routine (but that might help) because I am hoping to write it myself and learn a bit mo…
... tables * 256 bytes of every byte value rolled right 1 to ... build the table in the back buffer (so it can only ...Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... />
I draw to a back buffer in non-contended RAM ... /> ld bc, 32*8*24 ; byte count
ldir ; block copy ... need to XOR the high byte with #e0 to map from ...Microdrive Games CartridgeI've just noticed that Ant Attack on the microdrive [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0014815"]Games Cartridge[/URL] (also bundl…
... , the girl graphics are OK. Back in 1985 they wore white ... Attack has a short 76 byte BASIC bootstrap which then loads ... /> For microdrive loading a 600 byte buffer was required for a ...OptimisationI've participated in several thread hijacks about this, so perhaps I should open a new thread. Et VIOLA! Here it is! Knuth, who was earlier reporte…
... it silly to waste a byte and 3 T-states even ... trap recently, walking a list back and forth with (hl) - actually ... always in the same 256 byte page - instead of using the ...Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
... simple "factor out the common byte sequences and index to them ... I knew this in the back of my mind anyway, if ...Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
... .[/QUOTE]
Way back in 2003 (has it been ... ld a,(de) ; get current byte
and c ; mask off ... ; move on to next memory byte
ld c,$80 ; ... start with first bit in byte
.cont2
djnz ...Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
... save its state and come back to it later for more ... the following form:
1 byte = number of chunks n
byte-aligning will make accessing them ...Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
... or whatever.
But back to compressors:
I myself ... storing 4 fields in a byte and unpacking this (4 values ... differently sized.
In 1 byte up to 4 positions with ...How do you destroy an enemy or object?Hi guys I allways wanted to know this, but how would you go about making and destroying enemies in basic or any language? What, do you use a huge ar…
... block is simply placing it back on the corresponding queue. This ... cycles consumed. Overhead is one byte per block.Platform Game Designer 2Right, with Telly Heroes out of the way, I've decided to have a second attempt at this. I've ditched the old PGD2 source, and started again with the…
... to do most of the back-end stuff.
Maybe it needs an extra byte for an alternative image, so ...How do you destroy an enemy or object?Hi guys I allways wanted to know this, but how would you go about making and destroying enemies in basic or any language? What, do you use a huge ar…
... teams of large software houses back in the day.
Joffa indicated that programmers tended to ...tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …
hehe, back in 89 i would kill ... for seeing commented source by Joffa. or sell my body for ...address 23760 etc.Hi all, Where could I find Spectrum 48 addresses, what's in 23760 for instance ? Thanks for advance ! -jp
... Polish version in the past, back in the days when we ... must always CLEAR to 1 byte less than the location you ...Machine Code for BeginnersHi folks. [sort of] newbie alert. Not new to Spectrum - been there since getting first rubber key 48k in 84 and a regular visitor to WoS for many y…
... , covers all the basics in byte-size chunks.
[*]Hardly relevant ... ]me[/I] learn Z80 code (back in the days). Some other ... the gaps. And then go back to books + reference docs to ...various gameslisting time again, more doubles.. more over the next week. [url]http://shop.ebay.co.uk/rhodesvibes/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p3686…
... br /> Chub -Gristle -bug byte
Chuckman -Mastertronic
byte
Empire strikes back - Kobyashi Naru / ... /> Friday 13th -bug byte
Future Games - ... Gladiator -bug byte
Grange Hill -bug byte
Incredible ...More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... TAP palette files or 64-byte raw files.
- CLUTmasks - restricts ... ' of nearby yuvs is scaled back when a palette entry is ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... p_at and p_print subroutines back into the p_main section ... after by resetting D back to what it was ... /> jr p_start ;loop back to do it all again ... b ;to the corresponding first byte of Spectrum
... all 8 bits of the byte
.......
ld ...
