-
128K+ Keypad Swapsies.I've been offered a swap, a Spanish 128k keypad, for one of my UK microdrives. Is this a good swap?
... . Also you'll need to add the following to the original keypad read ... />
[code].l386e push ix ; save IX (why?)
; call l02bf ; scan ... be paged in)
pop ix
ret[/code]
Saving space using procedural graphicsAfter spending several hours playing around with various packers to squash the Alien8 test screen$ it occured to me that maybe bigger space savings c…
... you can do is add simple preprocessing to compression chain.
value for [X,Y] with given ...ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…
... it comes down to whether you want to build it yourself ... , so if you intend to use your ZX81, it ... I more "emotional" attachment to the ZX81 and less time ... my own video mod does add value to the ZX81. And, creates ... some of that missing attachment to it, funny as it ...Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…
... npn transistor the signal tends to have a lot of jitter ... resistor (10 kOhm I think) to GND. The source is grounded ... (I think, have to look for the real value) to 5V. This way ... /> A different solution would be to add a TTL inverter into the ...WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …
... /> That code snippet is going to get used all over the ... /> Ok as this was supposed to be a 'Space docking simulation ... />
Lets set the background to something a bit more outer ...
60 FOR N=1 TO 2
70 IF CT ...Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…
... B]04. If necessary, add another inverter to buffer the output signal ... frequency much, you'll need to adjust component values. Most ... , or experiment a bit to see what range works reliable ... can probably use the same value. With appropriate component values, ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... basic will return the value from 0 to 65355 in the BC ... write the value 0 into the BC register, ready to increase it ... the instruction for load a value into a register or register ... bc ;retrieve score
To add 1 to the score and save it ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... there were versions of the ADD, SUB, ADC, SBC, ... every register, so why not ADD, SUB etc. too?
to use ADD HL,DE to overflow as ... />
Or better just ADD to overflow:
instead ... not be ideal to set DE to the value you want ...Spectrum Classics - Renegade 128[url]http://www.youtube.com/watch?v=YoqHZfVum5I&feature=youtu.be[/url] I have to admit I love this game loads and its shameful that I aint played it…
... first level and the last, to add replay value :) Target Renegade Zero.CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…
... br /> ld hl,$0000
add hl,sp ;HL=stack pointer ... of bytes to copy
add hl,de
ld ix,(23653) ;STKEND ...
ld d,(ix-2 ...What do you want from the next gen consoles?As I've been playing Skyrim again I was wondering what I'd want from the next gen version. Better graphics are always a bonus, but, as we all know 'b…
... if we have to have them, then add an option to disable them ... 't have to cycle through several menus just to get to the game ... tested exhaustively before being committed to disc/cartridge. True, some ... (I don't know the value) percentage of the distributor's ...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... there's no need to store multiple alternatives for ... every time we add an item to the linked list ... number of bits corresponding to a literal. Afterwards, ... find out the exact value for "bits_best_case" at ... entire dictionary only once to discard any entries ...Memory diagnostic toolIs there any sort of memory diagnostic tool for examining .Z80 files so I can easily identify large areas of blank memory? Scrolling through ZX Spin…
... To check for some other value just change the value ... (value) block
VALUE: equ 23681 ;address of value to check ... /> push hl ;found a (VALUE)
dec hl
... ld a,(VALUE)
cp (hl)
Speccy PSUI've grabbed a Speccy PSU from fleabay and it looks like a Speccy Plus PSU. After testing it with a multimeter it's kicking out 12V rather than the …
Just to add some confusion to the topic, I measured ... you should measure the RMS value of the voltage. This ... you will measure the peak value. If you put a ... voltage will fall close to the RMS value, depending on the ... it is normally nice to see the change in the ...Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…
... . Driver calculare relative values, add this values to true variables for cursor ... range then set position only to range value).
Reset mouse ... (Y = 3/4 of readed value) = max value 255 will decrease to 191 :-)Setting up an IDE HDD on the +3e helpHello, Just installed a HDD in my +3e (ROM ver. 1.11). When turning on it takes a few seconds longer but then shows 2 IDE (available) as well as 1 fl…
... you have to add additional lines to the Z80 to get the ... htm"]read here[/URL] to see what modifications you ... the device to copy data to.
To get full ... take take a 16bit value from the drive and ... are then amalgamated as one value.
This ...Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…
... ] thread there are 2 things to sort. Firstly, the random crashing ... cause different crashes.
Add this poke:-
ram ...pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... you are applying asymptotic analysis to a limited size problem (i ... e levels limited to size 24x32). Therefore the value of these constants ... s the entire code to add an element to end of queue:
to anyone interested, not to argue about your ...pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... that you don't add the heuristics which guides ... s also required to calculate and add estimated distance to source. If ... different value from multiple recalculations, you also need to check ... will need to calculate estimated distance to all goals to compare ...Thinking of modding an Atari paddle controller for games like Arkanoid...Hello, Was thinking of trying out a controller mod using an Atari 2600 paddle controller to use with games like arkanoid, Batty, etc... The paddle c…
... ld a,(OldValue)
add a,c
ld h ... /> ld a,(Position)
add a,b
ld (Position ... br /> Position: db 0 ; Value to check from your main program ...Rotronics Wafadrive v.1.80 ROM - Corrupt or purposely broken?I've been digging around the Wafadrive v1.80 ROM (from [URL="http://zxspectrum.it.omegahg.com/_RO.htm"]here[/URL]) and can't decide if the ROM is cor…
... in the range $1B through to $35, so the routine is ... after doubling (add a, a) the hook code value to produce a word ... $36 ; Hook code range = $1b to $35. Check not out of ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
Yes, when you add sprites is difficult to reach 50fps. The main advantages ... as easy as writting a value to a port. Of course every ... suppose that this is similar to C64, but I don't ... ", etc... in BASIC (3rd link) to try the scroll yourself.Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... that updates the current checksum value (in H) with the ... to make my hacked loader sound similar. XORing with a constant value ... changes the sound while preserving the structure inherent to ... ROM loader needs it to distinguish between headers and ...
