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More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... don't need any more memory to store the screen, and ... if the ULA can only read two bytes per 8 pixels ... if only over the lower 16K of RAM. I suppose now ... -
some debugger in emulators that is able to brakpoint when a mem address is accessed ?Is there a debugger (disassembler) available in some emulator that is able to stop (breakpoint) when a particular memory address is accessed ? For e…
... br /> Code:
UNTIL 32768 IF HL=2
That ... will break when PC is 32768, but only if the ... a condition that reads memory, this can be done ... debugger to specify a read from memory. The address needn't ... on its own without checking memory / IO status but ... -
just thinking about ...compo for zx 16k ? anyone ?
... , how much memory would be available for a 16k game?[/QUOTE]
32768-23755 = 9013 bytes - 4 bytes ... -
Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…
... assembled at address 32768. This will grow upward in memory as your ... of memory management:
1. program grows upward from 32768 by ... the spectrum, the z80 will read a random device id during ... -
Come along chaps......(From the Dr.Who Thread...) [QUOTE=guesser;412226]oh dear, I've been told off! sorry for losing my temper and taking everything out on you ewgf. Yo…
... -enough 16k and 48k emulation, games were only available as memory-dump ... some topics, I don't read them.
Imo we have ... -
Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... =retrogod;425623]Also have you read the previous few posts about ... exchange of much resources (work, memory) for nothing.
for me ... using an empty level buffer (16K) for 3-4 pictures, music ... -
Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…
... TO 4 : READ A: LOAD t$+STR$ (a)CODE 32768: RANDOMIZE USR ... A
30008 LD HL,32768
30011 LD DE,49152 ... A
30036 LD HL,32768
30039 LD DE, ... A
30064 LD HL,32768
30067 LD DE, ... a different way to bank memory used in +3 when loading ... -
Problem with Spin 0.7s +3 file I/OI'm currently trying the +3 disk functions in z88dk. I've based my work upon the simple snippet Winston posted a while ago, but doing the contrary. H…
... swaps something into the top 16k (presumably, please look it ... the binary by default at 32768 and up so the ... stack was moved below 32768 so as not to conflict ... DOS needs to know what memory page to be paged back ... that if you do any memory paging on the +3 ... -
My first platformerHi all! How do you do? Been lurking here for a while, but never had the courage to join the forum. :) The Speccy was my first computer, so I've alw…
... 'm running almost out of memory. (Don't blame other people ... . Additionally, sp1 is a very memory hungry sprite engine. Not wasteful ... ;430917]The ROM BEEP routines read the system variable BORDCR.
Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…
... .
[quote]
I read through the links you gave ... see anything about how the memory is mapped out ? What I ... is also the contended memory.
32768 to 65535 is the remaining ... /> The spectrum manual has a memory map if you wish for ...Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…
... br />
The first 16K (addresses 0-16383, 0000-3FFF ... br />
The next 16K (addresses 16384-32767, 4000-7FFF ... screen data from this particular memory chip (or chips), which ... the 'contended memory'.
The remaining 32K (addresses 32768-65535, ...zx81 internal ram upgrade?just curious if others have? I mean can you just rip the memory out of the ram-pack and use that.. as I'd rather just have the unit upgraded interna…
... row of small DRAMs inside (16K x 1 bit?), no ... after that, and voila... internal 16K RAM (only half of the ... ZX81 software that uses >16K anyway, I didn't ... logic (read: one or more extra IC's). The internal 16K didn ... for some info on ZX81 memory decoding.Resolving USR entry point into a data + m/code block?Well, I had another look at that Merlin listing and decided that blowing up the faint page made it possible to read everything (with a struggle). How…
... the fact that it's 16k and a quick scan through ... on the value at the read address.
Taking those ... of code should reside in memory and you should find the ...Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …
... 's asm output below 32768, but I think it ... channel sound out of a 16K speccy -- BEEP only ... problem is that contended memory access isn't just slow ... .dropbox.com/u/7642722/16k-cacophony.tap]Here[/url] ... channels) in contended memory. It sounds pretty funny!Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …
... Beepola's asm output below 32768, but I think it will ... -channel sound out of a 16K speccy -- BEEP only works in ... ). The problem is that contended memory access isn't just slow ...Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... issue 4B: thye ROM memory check routine gave me 49152 ... but apparently, the upper 16K block were ok, as I ... being mapped in the range 32768 - 49151. So, a ... machine, try this: POKE 32768,100 . Then POKE 49152, ... 200 . Then, PRINT PEEK 32768 . If you get 100 then ...Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…
... /> - A bad lower memory chip with intermitent failures.
READ a: POKE n,a: ... and fourth 16K page)
To test upper memory only, ... To test both lower memory and upper memory, use 32763 for ... testing lower memory, when testing lower memory you will ...SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…
... it as it describes the memory map, hardware ports, etc.
16K pages = 512K
org 32768
di ; disable interrupts ...zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... the memory map you have contains a lower RAM region (16K) which ... />
Do a POKE 32768,0 and check the result ... with a PRINT PEEK 32768. Is it 0?
... Do a POKE 32768,255 and check the result ... again with PRINT PEEK 32768. Is it 255?
...The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …
... you cannot read/write words or longs to odd memory locations. The ... four horizontal/vertical combinations saving memory.
The VDP ... character map in VRAM. The memory buffer automaticly wraps round on ... #0,d0
move.w #32768-1,d7
@clr move ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... ROM 32768
This will upload the entire Z80 memory map ... INTERRUPTS*
; Read bytes from AUX port.
exx
; ------------
read ld a,00010000b ; RxD
jp nz,read
ret
[/code ...SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…
... ?
[CODE]
org 32768
IN A, (vmpr ... /> RET
print usr 32768
[/CODE]
Gives ... assume is 1? (if I read the value using the code ... address 0, or address 32768. The first 16k will be the initial ...Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... (0) to other locations above 32768 and see if they return ... /> [QUOTE=lillaolle64;487614]I have read somewhere that if you put ... then, with time, the faulty memory chip might damage your "piggybacked ... is smarter than many traditional memory testers, but not as ...Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... (0) to other locations above 32768 and see if they return ... 't even matter if address read/written is different than intended ... . As long as address read = address written, [I]any[/I ... are much more robust than memory IC's with tens or ...designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... I've had a read through this thread as you ... BITS (1 BYTE) from memory and has 16 BIT ... numeric data for registers or memory etc, you use the ... instruction. Then came the memory load and store which got ... Opcode 1001 1111 - A = 8000h (32768)
0011h LD A ...Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... up on getting them to read as stand alone files. ... on memory thinking page '0' is mapped into the last 16K ... sector data as I read it in but I ... Download data to 48K memory map providing download link is ... Upload data from full 64K memory map.
Catalog +3DOS ...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…
... BIT count could never be read for the last section ... .copy
or ecx,32768
mov [edi+0],cx ...
.region: ld c,(hl) ; Read count
inc hl
; ------------
.copy: ldir ; Memory copy
.next: ld ...Programming flash eprom on DIVIDE+Can you test it on DIVIDE PLUS ? [url]http://velesoft.speccy.cz/other/flasher-divide-plus.zip[/url] (This flash utility is WINSTON's flasher for dia…
... bytes) and RANDOMIZE USR 32768 start assembler PROMETHEUS48 with source ... copy any system from DIVIDE memory 1-15(number of virtual ... /> - support for write/read configuration bytes from DIVIDE PLUS ... DIVIDE firmware, type of memory mode (DIVIDE or MB02+), ...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…
... /> [code]
; Code to read (nearly) 16k bytes from port 191 as ... will be read into a buffer starting at address 32768
32768 in theory, but no benefit ... trigger...
LD HL,32768 ; Start address for first INI ...Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …
... be reduced to achieve some memory savings.[/QUOTE]I understand ... local variables both consumes more memory and is slower. [...] Likewise, ...
Which leaves me about 16K for code, libraries, screens, other ... ramdisk and C's usual read()/write()), and all of ...
