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Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... of character in video memory
ld b ... Y0
Memory address (ZX Spectrum arrangement)
Memory address (C64 arrangement)
... byte of the display memory address, we increment ... high byte of the video memory address)
Android memory questionErm, I was sure there was already a thread about this before but I couldn't find it, perhaps it's deleted or something. So I'm asking this again. I …
... ), but it fills up its memory pretty fast (and gets real ... the SD card help reduce memory usage?
Thanks in ...Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... such problems, the paged in memory behaves itself as it should ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... end.
Ran the memory test
PRINT PEEK 23732 ...AGD memoryHow low has anyone got AGD memory showing but still works without crashing or errors. My Monty game is showing 30 and will not allow you to open any…
How low has anyone got AGD memory showing but still works without crashing or errors.
My Monty game is showing 30 and will not allow you to open any events to edit. If I add just one letter to any text it crashes big time, full reset.New Game: Escape from Colony 8[I]I can't really tell what happened, when they first attacked our base or where they came from, but Colony 8 is lost. My only chance is to get to ha…
... are quite expensive. Also Z88DK + SP1 don't help much in ... basically: I run out of memory and I had to cut ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... IF1 cartridges) and target bankswitched memory systems (including the 128k spectrums ... yet from the existing lib. sp1 is currently available if you ...Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…
... to fail the lower 16K memory test.
Does anyone ...ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…
... -- raster and ULA contended memory emulation for original 48k and ... />
1. Contened memory is emulated as described here ... some help with raster/contended memory
Mike & ... valuable insight into contended memory topic and useful discussions.< ...Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…
Quick question regarding contended memory...
I'm testing ideas ... the player code after 0x7fff memory address and the data in ... contended memory, and it doesn't seem ... being run from non contented memory, so I think it actually ...Memory testersHi, Just wondering which software people are using to test the memory in their spectrum. I have been using Zorn's memory tester as described here:…
... are using to test the memory in their spectrum. I have ... been using Zorn's memory tester as described here:
48k Memory MapIs there a link or info anywhere that explains the 48k memory layout? My game uses double buffering and I'm trying to decide where the best memor…
Is there a link or info anywhere that explains the 48k memory layout?
My game uses double buffering and I'm trying to decide where the best memory location should be.Sinclair QL bad memoryI googled around trying to see if there was a resource for this but didn't really find anything specific. I have a QL with the white screen proble…
... screen problem which indicates bad memory, so I plopped a Minerva ... you addresses of the bad memory...Problem is that doesn't ... help me identify which IC memory chip it is. Is there ... " a good chip on each memory chip but the only result ...Recommend-me-do - memory card devicesSo, both myself (with a +3 that has a dodgy drive) and my friend (with a +2) are looking at the various options for loading from memory card. What…
... various options for loading from memory card.
What do ... to find their way onto memory card?No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
... magic wand to remove the memory contention, what software would break ...z88dk v1.99A Release Candidate[b]Z88DK VERSION 1.99A RELEASE CANDIDATE[/b] Download from: http://nightly.z88dk.org/Releases/ The release candidate will be available for te…
... /> * [z80asm] Sections introduced for creating memory maps and compiling for bankswitched ... memory
* [z80asm] Modern operator syntax ... ), fzx (proportional fonts), BIFROST/NIRVANA/SP1 (zx), tritone music and bitfx ...New Game: CastawayI've released my entry for ZX Dev 2015 ([url="http://zx-dev-2015.proboards.com/post/748"]announcement here[/url]), a platformer for the ZX Spectrum 4…
... Z88DK cross-compiler and the SP1 library.
Again I ... basically consequence of the memory requirements of SP1. I guess is time ...Britsoft - Read-Only Memory Publishing"Britsoft" by Read-Only Memory Publishing is their latest book charting the rise and fall of game development in the UK from the early 80s to the end…
"Britsoft" by Read-Only Memory Publishing is their latest book ...48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …
... the top of the 48K Memory Map.
From ... /> 0 to 16383 - Read Only Memory
16384 to 22527 - Display ... br /> 23755 to 65367 - Available Memory
65368 to 65535 - User ... area '23755 to 65367 - Available Memory'
Also what ...Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…
... ZX Spectrum uses 4116 memory for the lower memory, which can be ... but when searching for 4116 memory, what speed in nano seconds ... refreshed, the contents of the memory will get lost? 15ns? ...
Same for the upper memory:
TMS4532-3 Texas Instruments ...Memory and Replacement ULA modules.Thought you might like to see my future proofed 48k version 6A with some upgrades fitted. Has had the following... Recap. Traco Power TSR 1-2450 p…
... regulator.
Lower and upper memory modules from... http://zx.zigg ...Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…
... command directly to the screen memory.
5 LET a ... into a different part of memory first then dump it to ...Ordered tapes and memory links.I did something a bit sad this evening... In the old days of Spectrum, I used to keep my tapes in those little plastic cases / racks from woolies.…
... , I get a very strong memory of the time and the ... in order to keep the memory link up:
I went ...Contended Memory, literallyDoes anyone else have the sort of memory where they have trouble just picking out info cold? I know we had a discussion about memory sometime last mo…
... else have the sort of memory where they have trouble just ... we had a discussion about memory sometime last month, but...
memory, but my brain wouldn't ... that's it, my association memory is broken. Its all there ...Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…
... 's clock and access the memory. As the ULA has no ... advance, it relies upon the memory being available to read to ...Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... ROM, which failed the upper memory RAM test, suspecting IC25 and ... high to enable the upper memory and under which conditions? Any ...128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... pondering on the 128k memory thing a bit, and ... br />
The 64k memory space is divided in four ... no way to page in memory there. Second chunk is ... Third is fixed to usable memory. Fourth is the bankable ... be in the always-resident memory (the fixed 16k + the ...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…
... get my head around the memory contention issues of the various ... best use of the extra memory. I've searched the forums ... /> I can understand that the memory is divided up into banks ...z88dk sp1lib with fzxThe numbers dont seem to display properly? fzx by itself works [quote] // for targets supporting fzx // zcc +zx -vn -startup=31 -O3 -clib…
... output CLIB_STDIO_HEAP_SIZE = 0 // no memory needed to create file descriptors ... /> intrinsic_di();
// Initialize SP1.LIB
zx_border(INK_BLACK ... // draw screen area managed by sp1 now
...Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... were to wire an additional memory chip, say a 6264 8Kx8 ... , in parallel with the main memory so that it sits in ... the Z80 reads from main memory, it might be possible to ... reduce the effect of memory contention considerably. Possibly with the ...
