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I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... c.s.s faq describing I/O contention.
The 48k ... to lead to the following contention patterns:
High ... /> in 40 - 7F? | Low bit | Contention pattern
------------+---------+-------------------
No | Reset ... -
DCP P-PACK (4K RAM I/O)Ive got these I/O Packs in fantastic conditon (one of them is boxed as you can see) It would be a waste to put them on ebay I feel, so I'm intereste…
Ive got these I/O Packs in fantastic conditon (one ... put them on ebay I feel, so I'm interested to see ... -
128 I/O portsIn The Spectrum Hardware Manual there is a small circuit on page 71/72 to allow 128 I/O ports by using IORQ+A7 to override IORQGE, so any I/O access …
... to allow 128 I/O ports by using ... IORQGE, so any I/O access at a ... so freeing all I/O ports in the ... Looking at the 128 I/O ports patch, it occurs ... /> /
|\ |/
A7---+ O---+
|/ |\
v
... -
List of I/O ports used by common peripherals?I remember looking at a file (just plain text, IIRC) a while back that listed all the IO ports used by various bits of Spectrum hardware, such as the…
I remember looking at a file ( ... disc drives etc.
I just can't find the ... exists? Does it include the I/O ports used by the DivIDE ... -
Tape I/O in z88dkAccording to the documentation, z88dk appears to have facilities in its spectrum-specific library for tape i/o - [url]http://www.z88dk.org/wiki/doku.…
... spectrum-specific library for tape i/o - [url]http://www.z88dk.org ... -
J Invalid I/O devide, why ?Just tinkering with the asm code i got this error when executed the C/M: J Invalid I/O devide the liune that caused this is 'Call 15DE' that calls t…
... tinkering with the asm code i got this error when executed ... C/M:
J Invalid I/O devide
the liune ... to call the subroutine so i just typed this line into ... -
I/O port adress map of Spectrum and interfacesI'm looking for an adress map of all the used and unused I/O ports for the ZX-Spectrum. Many years ago I designed an I/O board for the Spectrum that…
... all the used and unused I/O ports for the ZX- ... I designed an I/O board for the Spectrum that can adress 16 I/O ... Spectrum and as far as I know it also works ... made for the Spectrum and I would like to know ... is compatible with those before I try to combine them.< ... -
Buffered I/O how-to?Hello. How do I implement a buffered I/O? Not all Speccy's I've got will work with more than one device connected to the rear.
Hello. How do I implement a buffered I/O? Not all Speccy's I've got will work with more than one device connected to the rear. -
Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... contention and its implications when some "weird" bus cycles (such as I/O ... cycles with I/O addresses in the ... is both memory and I/O contention. Memory contention causes T1 to ... contention makes T1 to be enlarged 6 T-states if the I/O ... -
Multi I-O InterfaceHi all, I found this by luck, and just want to share. Did you ever noticed? https://www.ianjohnston.com/index.php/projects/58-project-022-zx-sp…
Hi all,
I found this by luck, and ... -project-022-zx-spectrum-multi-i-o-interface
If its ... -
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…
... SCLD still applies memory contention at these locations when ... port F4 when applying memory contention; contention is applied whether the ... is not there to fix I/O contention.
Timex SCLDs ... . They have the fixed I/O contention of the 5C112E and the ... -
I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... is halted during T1. For i/o contention, A0 + iorq needs to be ... is time to finish the i/o or memory operation, the ula ... at cycle 14337. if the contention becomes active after cycle 14335 ... c.s.s faq describing I/O contention.
[/QUOTE ... -
I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... c.s.s faq describing I/O contention.[/QUOTE]
Just a ... (like the ULA)? At present, I've no experience with FPGAs ... time in the next year I'd like to start experimenting ... with them and I'm quite interested in the ... -
Growing up... Jasmin supports 128/+2 nowHi, all. New version of Jasmin is available (v0.11). It supports ZX Spectrum 128 and ZX Spectrum +2 models. Try it [URL="http://www.dustedpixels.co…
... on what is memory and I/O contention in "physical" terms. How ... unlikely to me, since contention only take place when reading ... memory areas.
I'd like to understand this ... fully before I start to design and implement contention emulation.
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…
... and which due memory contention?
I am most interested in ... A0 [I]and[/I] ~IOREQ are low.
The contention pattern used ... /> But only the I[I]O contention pattern[/I] applies [I]never [/I]the memory contention pattern.
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…
[QUOTE=mcleod_ideafix;330315]Contention would apply when IORQ+A0 = ... read the Tech Info wiki! I/O contention isn't a simple on ... it's a memory or I/O bus cycle) if A15=0 ...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
Even if you fix the toastrack/grey +2 RAM contention you've still got all the I/O contention which the +3 based machines don't have, and a dirty bus as well. The toastrack is striking to look at, but horrible to use.contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... 've still got all the I/O contention which the +3 based machines ... be done to fix the I/O contention and the dirty bus?contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... be done to fix the I/O contention and the dirty bus?[/QUOTE ... can be done about the I/O contention. You could probably sort out ...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... be done to fix the I/O contention and the dirty bus?[/QUOTE ... ZX128+2A/+3)
[B]- I/O operations are not contended (fast ...Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…
[QUOTE=zub;525933]I had a quick read ... /> no snow effect
no I/O contention (can run many Pentagon demos ... me at first ? but I presume it's good enough ... , and I can believe that it might ... then refuse to run (although I haven't found a program ...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... documentation specifies the +3's contention model.
[ ... that doesn't have any contention at all. Demos written ... 3 contention model than the 128 contention model because the I/O contention in ... still run on the +3 contention model, just sub-optimally. ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... have to deal with contended I/O on the 128/+2. Not ... to the +2A (no I/O contention). But basically I'd avoid doing a ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... a 48K ULA which does I/O contention, I should go for a ... implement I/O contention as well. Well, honestly I don't think that I/O contention ... is a big issue for software, as I/O operations ... will perform, not the I/O operations (for a large ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... a 48K ULA which does I/O contention, I should go for a 128K ... implement I/O contention as well. Well, honestly I don't think that I/O contention is ... a big issue for software, as I/O operations ...New interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…
... emulates pentagon? I mean pentagon has no memory contention, is this ... interface removes contention of +2 ... then PROFI INTERFACE disable I/O contention on all ports(only port ... original memory and ports contention as on ZX128, or ...ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…
... re-visit a Spectrum clone I was designing, using a CPLD ... 20MHz CMOS Z80.
I'd got a far as ... but without the memory and I/O contention.
Hopefully this ULA ...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…
... Contend all I/O ports
- Do a preventive I/O contention based upon partial ... need to trigger the I/O contention handler is IORQ from ... triggering the I/O contention handler as if an I/O request to ... being included in the I/O contention handler, or do we ...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…
... will be valid throughout the I/O cycle.
... 686350]
All ULA I/O ports must be contended, ... Contend all I/O ports
- Do a preventive I/O contention based upon ... I/O ports and uncontended* odd I/O ports. [I](* Or very little contention.)[/I ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... output and the contention pattern, which I believe you have ... are of interest: how I/O contention affects ports 0x4000?0x7fff, ... detail of the contention pattern and its synchronisation, ... whether spurious contention is applied as per ...
