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Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
You mean [b]other[/b] than the memory paging, timing changes and almost everything else that makes the 128K different from the 48K other than the AY chip? -
Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
[QUOTE=Philip Kendall;259811]You mean [b]other[/b] than the memory paging, timing changes and almost everything else that makes the 128K different from the 48K other than the AY chip?[/QUOTE]
LOL!
Chris -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... sure I got the ULA timing 100% right. We know when ... to figure this out by paging the shadow screen in and ... uses early or late CPU timing, please run the btime test ... /> Thanks a bunch.
Patrik -
New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…
... br /> * Full 128k paging support - the memory paging of ZX Spectrum 128k ... both ROM and RAM bank paging and shadow screen support.< ... emulator with reasonably precise T timing and with enough speed to ... .org/infoseekpub.cgi?regexp=^Patrik+Rak$]this guy[/url]... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... , as well as correct any timing information stated above. I would ... .
Thanks,
Patrik
P.S. For ... -
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…
... I added support for Pentagon timing instead, so I can finally ... the floating bus behavior and timing. An explanation how the ULA ... .
Thanks,
Patrik -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... /misc/timingtest-0.2.zip"]timing test[/URL] to include tests ... can run to do the paging. Note that the test should ... such case, though.
Patrik -
Paging questionI've a question regarding paging on the Spectrum 128K, +2, +2A, +3, etc, etc. Suppose we are running a program in the page that happens to be.. well,…
I've a question regarding paging on the Spectrum 128K, +2, + ... a real Spectrum ? Or is paging fast enough for the processor ... -
128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …
... problem getting my brain around paging. Well, actually the bit I ... /> Port 32765 controls the memory paging. Bits 0-2 determine the ... -
Tough paging questionOK... Take this: 1. We have a program compiled and run from within GENS under a Pentagon 128K environment. 2. The program works perfectly. 3. We sav…
... glitches, especially in matters of paging.
6. The generated code ... :
I thought the paging system for the RAM on ... different in matters of RAM paging.
And, Cyborg, yes ... -
TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …
... /> Is their away of obtaining timing information on ZX128k other than ... -
ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …
... ROM-1, which means the paging code needs to skip those ... /> The RAM part of the paging routine should live at 23296 ... -
Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…
... . I am just messing with paging memory in and out (not ... -
New ZXDS releaseHello, new ZXDS version is ready and will appear on [URL="http://zxds.raxoft.cz"]the site[/URL] in few hours time, so make sure you check back befor…
... adding support for the Pentagon timing, I have focused solely on ... />
Merry Christmas.
Patrik -
Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS) -------------------- In the +3, we have crammed in more than twice the amount of memory…
... using a process called
paging - BASIC (and the processor) always ... KB of memory with proper paging?
I always believed no ... -
TR-DOS in ZXDS[QUOTE=Patrik Rak;278549]The goal is to get the TR-DOS working, I have started working on that yesterday, the TR-DOS ROM paging already works nicely …
[QUOTE=Patrik Rak;278549]The goal is ... yesterday, the TR-DOS ROM paging already works nicely and FDC ... to get working?
Patrik -
RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…
... some detail information about RAM paging on the Spectrum 128 and ... , TC2068, TS2068
No RAM paging, but always fixed 48k RAM ... :
In addition to the paging methods of the Spectrum 128k ... select the RAM bank for paging at address C000..FFFF.
128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... />
[code]
; 128 rom paging routine
; use rst 28h ...
;;rom0
paging
org 0x0028
ld ...RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …
... light as to how RAM paging actually works, at a hardware ... is employed to trigger the paging?128kB software with incorrect memory pagingI search all ZX software using incorrect memory paging via OUT (253),A. This software must write to port data value with D6=1 for compatibility with …
... ZX software using incorrect memory paging via OUT (253),A. This ...48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…
Here's v1 of the timing tests for the 48k Spectrum, ...Paging memoryI've been thinking about a possibility of paging blocks of memory to and from disk. Imagine dividing usable 32KB of Speccys RAM (why do they call it …
... thinking about a possibility of paging blocks of memory to and ...Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…
Which emulator is closest in timing to an actual (48k) spectrum?< ... />
Hmm.
Getting accurate timing for sound is going to ...Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…
... one.
All this timing is for 48K machines. The ...new esxDOS beta 0.8.4I've made a video of the new esxDOS beta firmware version 0.8.4 kindly sent to me by Phoenix^ra a couple of days ago for testing. The main new featur…
... . Unfortunately the pentagons have different timing to the spectrums, and me ... use OUT (253),X for paging as its only 4 bytes ...Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
Is the timing of the Timex Computer 2068 ... 6C001 ULAs. The contended memory timing seems to be the same ... ; however the I/O timing is quite different, not least ... test the contended I/O timing. Plenty of other ports should ...Enable 128kB paging in emulatorFrom Zx Spectrum documentation ([url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url]) [CODE][SIZE="1"]When memory is being pag…
... "]Bit 5: If set, memory paging will be disabled and further ... Spectrum behaves - if you turned paging off, there is no way ... have a .z80 snapshot where paging was disabled before saving and ...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…
... bit is used for memory paging mechanism.
After ... and always enable betadisk memory paging mechanism. Then after reset/power ... port #7FFD is set) then paging mechanism of BETA128 interface is ... br /> bit 3 = Head load timing
bit 4 = select SIDE ...Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... awkward it even throws up timing differences between the 128K and ...
