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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 :) )
Help! Reverse engineering a Spectrum game[deleted]
... /> 06 - A set of fast memory copy and memory store routines
07 ... - A fast clear screen routine ... information
10 - A solid fill routine that is optimised when ... 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 ... br />
10 - A solid fill routine that is optimised when ... B]
12 - A fast sprite routine, that is; optimised ... B]
20 - A fast screen address lookup routine, that ...Flood FillHi Folks, Can anyone point me to a flood fill that I can call from ZX BASIC? I have looked through the archive and although there are posts about…
... was "fast flood fill routines, requiring as little code+data+runtime memory as ... ://www.zxprojects.com/images/stories/fill.zipPorts 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of usable memory to play with, of course ...Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …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.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.The Non Randomness of Sam BasicHows about this for weird. Hardly ever bothered with such simple stuff before but this is what I just did on the Sam ( as in a real one now I've got …
MrCheese: indeed - that's exactly what my diagnostics rom does for the random memory fill test - to check the memory still holds what it was set with, the PRNG is just re-run with the original seed and compared against the contents of memory.Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... the same 8 kilobits of memory (or something similar). This won ... get caught by a random memory fill test. One I've seen ...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,…
...
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 ...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 ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... Pattern
;PseudoRandom Memory Fill
;Store end of scan ... HL ; Restore Seed used for memory fill
LD (SEED16),HL
memory
INC HL
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 ...Escape from Kharkhan 'new' gameHi all. For all fans of good games I present the English version of "Escape to Kharkhan". The Russian version was available for quite some time, but…
... (IM2 table is in slow memory 16384-32767)
RESULT ... +fixed (correct register I, use fast memory pages, remove instructions IN 7FFD ...Escape from Kharkhan 'new' gameHi all. For all fans of good games I present the English version of "Escape to Kharkhan". The Russian version was available for quite some time, but…
... (IM2 table is in slow memory 16384-32767)
RESULT ... +fixed (correct register I, use fast memory pages, remove instructions IN 7FFD ...WTF stupid machine10 LET X = 28672 or 61440 depending on how much memory you have 20 LET A$ = ?? 30 IF A$ = ?? THEN INPUT A$ 40 LET Y = CODE A$ ? 48:IF Y>9 THEN LET Y …
... I'd suggest reserving more memory, as he just starts ... almost the end of the memory map.
So ... of non-contended (that is, fast) memory.
Also, I ... ;32767 THEN PRINT "No more memory!": STOP
... THEN PRINT "No more memory!": STOPGames in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... . Secondly, some processing allocates memory space for object pointers for ... in two passes without shifting memory around. Think about it; ... '0' and use a memory fill to build the sorted destination ... would need 4096 WORDS of memory (8 KBYTES). Fortunately, on ...Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... Z80 code to restore repeated memory and execute game (13 ... buffer. The last memory fill operation will overwrite those ... construct the data using memory copies and fills... ... /> ; ------------
.copy: ldir ; Memory copy
.next: ld ...New game! Crimbo!Hi all, we are very proud to announce our new game: Crimbo - A Gloop Troops Tale. [url]http://www.littleshopofpixels.co.uk/games/crimbo/crimbo.zip[/…
... IM table will used in fast memory = 32768-49151 (I=#80-#BF ...Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
... 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 ...
