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R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... as there's a single HALT.
So my questions ... . What is the effect of contended RAM on the R-register ... not run any code in contended RAM, but I do make ... , but then without the contended RAM the HALT would take place earlier ... -
Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…
... the +2A/+3 having different contended banks...
Anyway, I ... -
IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... bus cycle that might affect contended memory, and the ULA stops ... is, IN 255 is not contended.
Here you have ...
TestInFF proc
halt
ld c,255
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... describes the detailed timings of contended RAM. It gives timings ... residing in, or reading/writing, contended RAM.
... LDIR instruction in non-contended memory, and the source ... and destination (DE) addresses in contended memory.
Machine ...BEEPER music compo 10-11 July on Di:Halt partyoh yeah! public pressure organizers [B]Di:Halt [/B]which will take place [B]July 10-11[/B], agreed to hold the [B]beeper music compo[/B]. The rules…
... ! public pressure organizers [B]Di:Halt [/B]which will take place ...Quick question regarding contended memoryIf I've read the documentation correctly, the following applies: 128k/+3 "Memory banks 1,3,5 and 7 are contended" +2A/B/+3 "RAM banks 4, 5, 6 and 7…
... ,3,5 and 7 are contended"
+2A/B/+3 ... , 5, 6 and 7 are contended."
That means, that ...+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…
... some quenstions about,
contended RAM are banks 1,3 ... logic
now psysical, contended RAM are the IC's ...Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…
... be an issue with the contended memory not working as it ... [/url]
I implemented contended memory simplistically but I'm ... check if the access is contended and if so I slap ... an index.
My contended table is correct.
My ...Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... to get stuck on the halt instruction. I can't find ... with regard to SNA and halt, does anyone have the details ...Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... address bus during execution of HALT, beyond the initial M1 ... contains the following code for HALT:
[CODE] case ... the opcode fetch after a HALT could actually trigger paging ... of addresses well before the HALT operation finishes. While I ...Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…
... findings. I've been investigating contended memory timings on the Timex ... whether the CPU is accessing contended video memory or "uncontended" ROM ... might as well call this "contended ROM".
This solves ...Top Telly Tip... Halt and Catch FireThe series is set in the early 1980s and depicts a fictionalized insider's view of the personal computer revolution. The show's title refers to the f…
... the fictitious machine code instruction Halt and Catch Fire, which would ...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…
... [/url] -- raster and ULA contended memory emulation for original 48k ... rasters.
2. Contended memory works only if you ... : for some help with raster/contended memory
Mike ... your very valuable insight into contended memory topic and useful ...HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
Instruction breakdown of halt is like that:
... or interrupt.
if halt is already read by cpu ... and again to execute the HALT, why it still takes 4 ... /> I mean if cpu executed HALT at cycle 5, and if ...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 ... address and the data in contended memory, and it doesn't ..."Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…
... seems to incorrectly specify a HALT opcode as 0x7[i]7 ...Which Emulator has a menu option to enable Interrupts (EI) if emulated Speccy hangs after DI / HALT?Which Emulator has a menu option / debugger option to enable Interrupts (EI) if emulated Speccy hangs after DI / HALT? I tried SpecEmu and Fuse, b…
Which Emulator has a menu option / debugger option to enable Interrupts (EI) if emulated Speccy hangs after DI / HALT?
I tried SpecEmu and Fuse, but I can not find a option for doing this in their debugger.FrameSyncIt was many many years ago since i programmed assembly on the spectrum but I just picked it up again for fun. Now this is one thing I can't remember…
Using Halt is fine for this sort ... at some point if using halt, otherwise you would never get ... , ie. the instruction imediately following HALT.
If you wanted ... these phases of screen refresh contended memory can be accessed with ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... of the R register with contended RAM (according to Spin when ... using the Pentagon or No Contended RAM options).
I would ... HALT would be waiting for longer if there is no contended RAM ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
I don't think that HALT waits longer - it is triggered ... is performed if access to contended memory happens. More access to ... contended memory means more delays inserted, ... I remember correct. While in HALT, CPU performs NOPs to maintain ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... taken to reach the HALT command will be longer ... is uncontended. So the HALT will be executing less ... whether the memory model is contended or uncontended - I think ... time spent in the HALT command which, as we ...
I guess the HALT increments the R-register for ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... R-register because of the contended RAM. Each instruction executed ... the memory model. The HALT increments the R-register for ... If contended memory has been accessed during the frame, then HALT will ... was initially assuming that a HALT would increment the R- ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... anything (like the stack) in contended ram. D'oh!
ld hl, 10000
halt
call $8000
ld ... hl, 25000
halt
call $8000
ld ...
ld hl, 16384
halt
call $8000
ret ...Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…
... [B]EI[/B] and [B]HALT[/B], then the IM2 routine ... allow for the possibility of contended RAM.LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... Source (HL) is pointing to contended memory or not;
[*] ... Destiantion (DE) is pointing to contended memory or not;
[/ ... note is that contended memory is not actually contended until the ... screen rendering immediately after a HALT you can reduce the ...
