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What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... I could use the ROM routine (It would suffice, any pointers ... I'm asking for a routine :)
No need for ... -
Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... be better developing my multicolour routine on the 48K first, ... 've just written a routine that seems so awkward ... back in contention, the delay from the end of one ... that's a longer delay than the 4 bonus ... (nn),HL since the delay between memory operations is then ... -
Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…
Having problems with this routine, it basically fires a rocket ... tried allsorts to remedy this routine but nowt seems to work ... /> call print ;call the print routine
pop bc
djnz ... -
Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …
... for a simple memory transfer routine that shifts 32 bytes of ... -
Game loopJust working on my first ever Spectrum game, and am struggling to work out what the game-loop should look like. I've got interrupts enabled (mode 2)…
... ):
loop: halt ; wait for interrupt to occur ... and then the draw_sprites routine clears them off (unless ... was thinking about the halt instruction I then ... br /> loop: update_stuff
halt
clear_sprites (from old position ... -
Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…
... data. Then a small MC routine must be coded in order ...
EI
LOOP:
HALT
CALL 27810+5
Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... address bus during execution of HALT, beyond the initial M1 ... contains the following code for HALT:
[CODE] case ... the opcode fetch after a HALT could actually trigger paging ... of addresses well before the HALT operation finishes. While I ...Top Telly Tip... Halt and Catch FireThe series is set in the early 1980s and depicts a fictionalized insider's view of the personal computer revolution. The show's title refers to the f…
... the fictitious machine code instruction Halt and Catch Fire, which would ...LM ram block transfer routineHello! I need to transfer a block of 33000 bytes starting from address 28000 to a new start address, 31000, using a LM routine. Please, someone coul…
Hello!
I need to transfer a block of 33000 bytes starting from address 28000 to a new start address, 31000, using a LM routine.
Please, someone could help me?Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... : PRINT AT 0,0;"Block Routine"
160 GO SUB 200 ... STOP
180 REM Block Routine
190 REM x,y ... />
Anyone got a better routine?
Many thanks
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... to use the ROM printer routine to print 32 characters each ... time the routine is called, updating the de ...Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... far, I've made my routine to last a number of ... main loop is full of HALT instructions, with some instructions to ... of instructions that aren't HALT last a number of cycles ... get by now is my routine starting at cycle 19,20 ...Soundex routineIn an idle 5 minutes I wrote a short routine to calculate Soundex codes using the algorithm described here: [url]http://en.wikipedia.org/wiki/Sounde…
... minutes I wrote a short routine to calculate Soundex codes using ...+3DOS routine missing in the +3 manualThe other day I realised the details of the +3DOS DOS DELETE routine are missing in the [url="http://www.worldofspectrum.org/ZXSpectrum128+3Manual/ch…
... of the +3DOS DOS DELETE routine are missing in the [url ...HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
Instruction breakdown of halt is like that:
... or interrupt.
if halt is already read by cpu ... and again to execute the HALT, why it still takes 4 ... /> I mean if cpu executed HALT at cycle 5, and if ...Playing AY music on the SpeccyCan anyone help with playing AY ripped music on the Speccy? So, let's say I want to play some ripped AY music, such as: [url]ftp://ftp.worldofspect…
... the routine, then call the data in tra_0_2.BIN per HALT command ...
EI
LOOP:
HALT
CALL 51802
JR ...Rom routine for pixel addressDear all, Having my bi-annual 'lets try machine code' project again and have come up with a problem with the pixel address rom routine at 8874. …
... with the pixel address rom routine at 8874.
Going ... be holding 128 after the routine is run?
Toboim looking for a basic routine that adds a numerical character to a stringim looking for a basic routine that adds a numerical character to a string. so a=1, "1", then a=0 "10", then a=1 "101......" and so on
im looking for a basic routine that adds a numerical character to a string. so a=1, "1", then a=0 "10", then a=1 "101......" and so onNew version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…
... />
Fixed Inves ULA Colour Delay. It only affects bright
routine is detected and reinserted the ...WANTED Machinecode Routine for Paging in Betadisk TR-DOS v5 ROMI try to build a small MCode-program which writes the TR-DOS-ROM v4 / v5 to RAM adress 40000 an up. It´s working on TR-DOS v4 / Betadisk 48k: C…
128k Paging a tile routine to a double bufferHi happy new year all :) Does anyone have an example of how to page a routine to the screen ie a tile routine? Thanks :)
Hi happy new year all :)
Does anyone have an example of how to page a routine to the screen ie a tile routine?
Thanks :)Variable sized tiles /tile routineHow would you do a variable sized tile routine where the tiles have position variables too? Thanks would be interested to learn :)
How would you do a variable sized tile routine where the tiles have position variables too?
Thanks would be interested to learn :)Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
... was testing this text scroll routine taken from Jonathan Cauldwell's ... /> JR NZ, L_35381
L_35387: HALT
CALL 00654
INC ...I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…
... how the PIXEL-ADD rom routine works.
My code ... , I'm assuming the rom routine at $22AA will convert the ..."Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…
... seems to incorrectly specify a HALT opcode as 0x7[i]7 ...Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
... trying to create an interrupt routine for playing AY music in ... />
I have a music routine in bank 6 that plays ...Cool program - buffer delayHere's something fun I wrote tonight thought I'd share. It's essentially a simple buffer delay. A building block for many things. https://www.drop…
Here's something fun I wrote tonight thought I'd share. It's essentially a simple buffer delay. A building block for many things.
https://www.dropbox.com/s/rk4q1xu2k2mkk62/BufferTest.z80Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... have a custom screen load routine that loads attribute first, then ... square. Loads in attribute order. Routine to convert normal screen to ... the counter in the load routine, not sure about printing it ... , to cater for a bigger delay loop.
Cheers.< ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... speed) real-time sprite shifting routine for sprites that are one ... sets again.
(The routine is shared between two sprites ...
