-
ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…
... limitation).
Port #14BF SCRN bits b7 b6 ... video data from.
Port #13BF BLK3 bits b7 b6 ... select (48-64k)
Port #12BF BLK2 bits b7 ... br /> contended, all even banks not). Bit 0 of port #14BF ... reasons, a write to port #7ffd will copy bits ... -
You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…
... Z80 and added a control port to enable a double speed ... make some difference, even in contended address space!
The ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... one 16k block that is contended.
These video modes ... />
* An IF1 compatible network port but again driven by hardware ... for the RS232s and network port. I would have wanted to ... useful feature was the network port that came bundled with the ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... one 16k block that is contended.
These video modes ... /> [quote]* An IF1 compatible network port but again driven by hardware ... for the RS232s and network port. I would have wanted to ... useful feature was the network port that came bundled with the ... -
Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…
... has the only I/O port - #FE (it's always selected ... 128k models, there's no contended RAM and there's no ... with both Scorpion-256 (#1FFD port) and Pentagon-512 modification (bits ... 6 and 7 of #7FFD port). This machine has expansion slots ... -
GP2X - Spectrum EmulationHi all. Looking for advice on the GP2X and (especially) the quality of its ZX Spectrum emulation. Has anybody anything to say about the console - is…
... should. It's due to contended memory emulation, which was only ... ://wiki.gp2x.org/wiki/Fuse]port[/url] of Fuse as well ... -
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…
... you get contention only for contended memory, and why you can ... IR contention and I/O port contention, neither of which are ... -
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…
... case. Is the first cycle contended according to the memory contention ... the #7FFF gets all cycles contended due memory contention.
Now ... applies IO contention if the port is even or stops applying ... any contention if the port is odd?
... -
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…
... the entire instruction was contended (contended according to certain criteria, ... appear to be contended when accessing a port in the ... contended cycles, and then the same instruction but reading port ... 0x00FF.
The first will be contended, the ... -
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…
... memory, is [b]not[/b] contended.
2) There is just ... attribute byte being read from port #7FFF at 14342.
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…
... memory, is [b]not[/b] contended.
2) There is just ... attribute byte being read from port #7FFF at 14342.[/QUOTE]
contended cycles when 4 will do ...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…
... in range #4000-#7FFF is contended as is any odd page ... -#FFFF range in case a contended page is paged in. This ... of the high range, port #7FFD is contended as any other odd ... port in this range (C:1x4 ...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…
... memory read/write are contended. Could've saved myself ... other T state is contended (with partial exception of ... memory write) cycles is contended, and so is any ... T states are not contended (the additional IO treatment ... of M1 cycle, and port address in case of ...Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
... low ram (16384-32767) was contended.
Are ... I/O ports being contended? This is new to ... , memory 49152-65535 is contended. ULA use for ports ... memory. For example: if port adress is set to ... slow mem.page, this port will contended too. (ULA not know ...Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…
... for memory. For example: if port adress is set to 49152 ... set slow mem.page, this port will contended too. (ULA not know ... example all even ports are contended, but differently. You can check ... />
Of course, the IDE port is not even, so what ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
... /> LDIR... failed (0xfb)
Contended IN... failed (0xfd)
Floating ... 0x01)
Contended memory... failed (0x01)
High port contention 1... ... mode it hangs on 'High port contention 2' but is ... . In 48K mode 'High port contention 2' passes (and ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
...
LDIR: failed (0x02)
Contended IN failed: (0x02)
Floating ... /> Contended memory: failed (0x02)
High port contention: passed
High port contention ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
...
LDIR... failed (0xfb)
Contended IN... failed (0xff)
Floating ... =0x01)
Contended memory... failed (0x01)
High port contention 1... passed ... (0xff)
Contended memory... failed (0x02)
High port contention 1... passed ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
... ... passed
LDIR... passed
Contended IN... passed
Floating bus ... ... passed
Contended memory... passed
High port contention 1... passed ...
High port contention 2... passedQuick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
...
LDIR... failed (0x05)
Contended IN... failed (0x03)
Floating ... (0xff)
Contended memory... failed (0x02)
High port contention 1... passed ...
High port contention 2... failed ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
... ... passed
LDIR... passed
Contended IN... passed
Floating bus ... (B=0x01)
Contended memory... passed
High port contention 1... passed ...
High port contention 2... passedQuick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... =0x01)
contended memory...failed (0x01)
High port contention1...passed
High port contention2...failed(0xfd ... (b=0x01)
contended memory...passed
High port contention1...passed
Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... to check the accuracy of contended memory and port emulation.Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…
... /> LDIR... passed
Contended IN... passed
Floating ...
Contended memory... passed
High port contention 1... ... /> LDIR... passed
Contended IN... passed
Floating ... )
Contended memory... passed
High port contention 1... ...Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…
...
LDIR... failed (0xfe)
Contended IN... failed (0x02)
Floating ... ... failed (0x00)
Contended memory... passed
High port contention 1... failed ... (0xff)
High port contention 2... skipped (B=0x01 ...Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... timings will be relating to contended memory/port access, which is detailed ...MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... />
[CODE]
;write PORT B(fixed destination
;adress ...
Since the divIDE data port has 8-bit addressing, wouldn ... />
[CODE]
;write PORT B(fixed destination
;adress ... will slow-down by ULA (contended ports).
...MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... must set high adress of port as 0 or use RESET ... user modify high adress of port in DMA as %01xxxxxx then ... will slow-down by ULA (contended ports).[/QUOTE]
Good ... occurs on 128K Speccy for port %11xxxxxx.48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... earlier)
5) Port 255. The +3 (+2A/B ... which sets a bit in port $7FFD which disables any ... 3/+2A/B models have port $1FFD which provides extra ... RAM on odd pages is contended on a 128/+2. ... />
14) The Expansion port is different between a 128 ...ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... and a contended bank pages in.
- A port read from port 0x7FFD ... bus value back to that port.
- A poor real tape ...
