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WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... adopted the "all ports are contended" approach, which means that I ... I/O cycle must be contended or not, and I've ... last attribute byte fetched from memory, or high impedance if the ... -
+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... about,
contended RAM are banks 1,3 ... main memory, and then we have uncontended memory "upper" memory with ... the same logic
now psysical, contended ... NMOS Dynamic Random Access Memory organized as 65,536 ... -
+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... decoded NMOS Dynamic Radom Access Memory organized as 65,536 one ... board that divide up the memory into banks. It is not ... any straightway answer where the contended RAM IC's are psysical ... -
RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... it to tell the memory chips which memory location the CPU wants ... CPU to the memory (writing a value to memory), or from the ... CPU (reading a value from memory).
The control bus ... .php?t=41071&highlight=contended&page=2[/url]
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... things using my [URL="http://zxds.raxoft.cz/taps/misc/timingtest ... that SpecEmu is correctly emulating memory contention and port *FF just ... particular, it would mean the memory contention cycle in TK90X actually ...Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…
... were 4 out of 8 memory ICs in the uncontended bank ... are IC's 25-32 (contended RAM) if these IC's ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... 11 cycles, or 16 when contended and done one after the ... (counter updates etc), the memory itself only produces contention when ... every time you access screen memory, you have 8 possible values ... tacts of delay per screen memory access. Using words halves this ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... executed in a non-contented memory. So we only worry ... for random accessess to screen memory during the screen drawing using ... be developed further. The memory is only contended during the screen drawing ... drawing time. If we get contended, on average, for 7.5 ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... executed in a non-contented memory. So we only worry ... for random accessess to screen memory during the screen drawing using ... be developed further. The memory is only contended during the screen drawing ... drawing time. If we get contended, on average, for 7.5 ...Kiss Kill - a Spectrum music video from Candy Says and GasmanYou may remember [url=http://www.worldofspectrum.org/forums/showthread.php?t=43068]the preview[/url] of this from back in March - here's the final re…
... are contended. I filled up the usual 32K of upper memory rather ... up using ones that are contended on the +2A/+3. I ...20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…
... this already - forgive my wonky memory).
Leave at least one ... , whilst you're in that contended time of the first character ...20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…
... this already - forgive my wonky memory).
Leave at least one ... , whilst you're in that contended time of the first character ...Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…
... one contended ROM chip (rom 64kB or similar). 32kB of this memory ... ROM to ZX ram, then memory is disconnect and 128rom(rom ...Kiss Kill - a Spectrum music video from Candy Says and GasmanYou may remember [url=http://www.worldofspectrum.org/forums/showthread.php?t=43068]the preview[/url] of this from back in March - here's the final re…
... are contended. I filled up the usual 32K of upper memory rather ... up using ones that are contended on the +2A/+3. I ...Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... asking is to do with memory contention. If the byte(s ... your pixel in upper 32K memory... and if you use some ... acted upon are in the contended 16K, then it would be ... 2 store operation on the contended RAM.
Instead, [URL ...Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... machines all I/O is contended. On the ASIC machines only ... the ASIC ports are contended.[/QUOTE]
Yes, that would ... decided to go with the memory contention, because it also helps ... most of them have no memory contention at all).display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... table.
A few memory fiddling tips - if you only ... (or an unused bit of contended RAM if you want to ... simply diverted away from screen memory.Another vertical scrolling questionwhile talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models? has extra ram or swappable screen buffer any…
... in at the top of memory, leaving you with only 16K ... 't know if it's contended or not, when it's ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... LDI when working both with contended and with uncontended memory.Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... you have space in the memory for the old and new ... 'd have to use up memory on it
3) To ... that the same number of contended video ram writes happen and ...Encyclopaedia Galactica (Remixed)Here it is at last, finally put to bed a few minutes ago: [url]http://www33.zippyshare.com/v/21829770/file.html[/url] This is the remixed version r…
... /> I didn't realise that ZXDS now reads and writes .szx ... that you can whip the memory card out and play on ...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'…
... is independent of the memory paging bits, but ... (a) all four contended (slow) memory blocks at once or ... 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 ...harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…
... banks 8 to F are contended.
Bank ... Bit 3 is external memory control for 0x0000 to 0x3FFF ... Bit 4 is external memory control for 0x4000 to 0x7FFF ... Bit 5 is external memory control for 0x8000 to ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... more test to [URL="http://zxds.raxoft.cz/taps/misc/zxtests ... rather than writing to screen memory, it pages the shadow screen ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... my paragraph below regarding the memory access. The fact that goodboy ... way in which processor reads memory without generating a delay ... meantime we have discussed the memory access of Pentagon in ... the attribute into [URL="http://zxds.raxoft.cz/taps/misc/zxtests ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... my paragraph below regarding the memory access. The fact that goodboy ... odd number of operations with memory per frame makes perfect ... this simple "dual headed" memory access. Are you sure about ... the attribute into [URL="http://zxds.raxoft.cz/taps/misc/zxtests ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... processor is trying to access memory, the internal counter is not ... to the processor accessing the memory, but the order of reading ... the first cycle of the memory fetch. The display values fetched ... am not going to slow ZXDS just because of something like ...
