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Help! Reverse engineering a Spectrum game[deleted]
... set of fast memory copy and memory store routines
07 - A fast clear screen ... any size
12 - A fast sprite routine, that is; optimised ... SIN/COS
20 - A fast screen address lookup routine, that ... and work with a raw memory snapshot of the game from ... -
Help! Reverse engineering a Spectrum game[deleted]
... /> 06 - A set of fast memory copy and memory store routines
[B]LDIR ... B]
07 - A fast clear screen routine using the ... B]
12 - A fast sprite routine, that is; optimised ... B]
20 - A fast screen address lookup routine, that ... -
Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…
... this a correct map for memory contention?
Address Size ... 08k Contended Memory
8000-FFFF 32k Fast Memory (well normal memory really :) )
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
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;YES. EXCHANGE ELEMENTS IN MEMORY
3 PHA ; ... hw support) is a fast byte copy (for copying a back ... main display) and a fast write/clear (for zeroing ... not the same as a copy, more limited) at about ...A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…
... /> [*]Keep a copy of selected block in memory somewhere (BANK_M in ... words: 1st update the shared memory copy, then do the actual ... between, and after such "update memory location, switch block" in ... get interrupted if it executes fast enough (& no cycles ...128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... (b) all four uncontended (fast) memory blocks, but with no way ... developers used the 128K memory as little more than ... use all that extra memory for anything in real- ... in chunks, you could copy data from one bank to ... fastest of all if the copy was to end up at ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... in one of the contended memory regions. - No slowdown in this ... counter-example might be buffer copy routines (floating execution window due ... loops or beeper routines in fast memory at all times. On the ...Idea about improving EmulatorHi, I got a bright idea today how to improve such excellent emulators a bit more. Okay, disassemblers are available in nearly every one new released …
... , chunks, painting on second screen, memory copy and bit-test, or HiSoft ... fact, a PC has enough memory and power to optimize the ... code for speed or memory usage, so the compiled code ...Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
... and A14=0, ports is fast (uncontended)
If A15=0 ... =1 and A14=1 and fast memory page is set, ports is ... fast (uncontended)
If A15=1 and A14=1 and slow memory ... read sequence 256bytes with all fast ports:
LD A,63 ...New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... almost four times as fast as the old Z80 chip ... clocked at 150 MHz if fast memory is used (i.e. ... of 16 MB of memory without a memory management unit, by ... The chip has a similar memory interface to the Z80 family ... with on-chip flash memory and on-chip zero ...Justin Beeper - new demo for the unexpanded 16K Speccy[img]http://pouet.net/screenshots/57726.png[/img] This was my entry for this weekend's [url=http://www.sunrisedemoparty.co.uk/]Sunrise[/url] demo pa…
... stylee, and the lack of fast memory on the 16K means that ... only having 9K of usable memory to play with, of course ...Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …
... data by the ULA and memory regeneration by the processor. ... ULA screen data and memory regeneration leads to the ... an address in the slow memory. For Spectrum 16/48 ... does not point to slow memory, and interrupt vector does ... snow it's always fast memory page.On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... I basically want to copy back to front screen ... you're using this fast stack-copy code with the "ld ... delay the start of your copy routine after the interrupt. ... your pixel-line order copy, you will be updating ... this time, if your copy routine is still running, ...+2 ramdisk - access in machine codeHow can you access the ramdisk in machine code? I've got a +2, and it seems the ramdisk has never been properly utilised. It would be a handy little…
... her article) ldir that can copy across memory banks:
... /> ; logical addresses for the memory copy. Restores the paging
; ... ; address space (the extra memory outside the main 64k bank ... since, for overlapping memory areas, a copy with the wrong ...What WAS going to be bundled with Bandersnatch?Just saw a documentary about the death of Imagine ( [url]http://video.google.com/videoplay?docid=-1012096952890708986[/url] ) and apparently they wer…
Most of the speculation is just essentially a maths co-processor with hard-wired matrix-based algorithms and fast memory manipulation algorithms plus memory store.Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
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On ZX48 is uncontedned memory area 32768-65535, but on ... area 49152-65535 slow or fast memory page. If page 0 ... or 6 is set, memory 49152-65535 is uncontended. ... or 7 is set, memory 49152-65535 is contended. ... slow-down method as for memory. For example: if ...ANNOUNCE: BASin r14 is up. New SCREEN$ paintbox included.Hi all, Well, I can't sit on this any longer - so I've released it. Let's all get a good testing session going, eh? You can get the new BASin [url=…
... . This was a zero-length memory copy operation which worked just a ...list of ZX games with raining effect(ula snow)If you know any ZX games with raining effect in screen, then add game name to list. I know about this games only: (tested on real ZX128+2 - grey) 4x…
... register I is set to fast memory = no snow. (ZX48 ula snow ...list of ZX games with raining effect(ula snow)If you know any ZX games with raining effect in screen, then add game name to list. I know about this games only: (tested on real ZX128+2 - grey) 4x…
... register I is set to fast memory = no snow. (ZX48 ula snow ...Accelerated spectrum?Hihi Has anyone managed to replace the Z80 in a spectrum with a Z80B? Just wondering if it'd be possible to have a couple of crystals switchable to…
... -16384 is possible connect 16kB fast memory (no slow-down by ula ...about ZXAM Amiga emulatorHello I have a question, ZXAM was shareware... do you know if Aminet ZXAM is shareware version or registered version. i am very interested in ZXA…
... speed. You had to have "fast memory" to come close if I ... get it optimised and working fast enough? {shrugs}about ZXAM Amiga emulatorHello I have a question, ZXAM was shareware... do you know if Aminet ZXAM is shareware version or registered version. i am very interested in ZXA…
... speed. You had to have "fast memory" to come close if I ...about ZXAM Amiga emulatorHello I have a question, ZXAM was shareware... do you know if Aminet ZXAM is shareware version or registered version. i am very interested in ZXA…
... speed. You had to have "fast memory" to come close if I ... get it optimised and working fast enough? {shrugs}[/QUOTE]
New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... , but almost four times as fast as the old Z80 chip ... clocked at 150 MHz if fast memory is used[/quote]
New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... almost four times as fast as the old Z80 chip ... clocked at 150 MHz if fast memory is used (i.e. ... of 16 MB of memory without a memory management unit, by ... The chip has a similar memory interface to the Z80 family ... with on-chip flash memory and on-chip zero ...New game - W*H*B - Help wanted!I'm currently writing a version of Cuboid/Bloxorz for the speccy, and was hoping for a little help from the WOS folk, or anybody, in designing levels…
... de-compressor is small & fast. Memory isn't a problem at ...VIDEO to VGA convertor[url]http://velesoft.speccy.cz/other/zx-vga/vga-convertor.htm[/url] Game examples: [url]http://velesoft.speccy.cz/other/zx-vga/vga-games.htm[/url]
... . they require a good quality *fast* 3 channel ADC for the ... cheap), and a good quality *fast* 3 channel DAC for the ... (not cheap either), and enough fast memory to support a 24bpp frame ... means you need vastly less memory too (a 256K frame buffer ...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…
... catching up and overtaking your memory copy routine, so in the last ...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…
... catching up and overtaking your memory copy routine, so in the last ... .[/QUOTE]
Tip 1: Copy the data from your workscreen ... area" of the display, then copy sprites from your workscreen. This ... go to the display, but copy the rectangle for each sprite ...QL microdrive cartridge questionOkay, I'm throwing this open to the Speccy community at large... Does anyone know what I would need to do to examine the contents of a QL microdrive…
... similar) - this makes a fast sector copy to ram disk and highlights ...
