-
128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
... code running in the memory bank you're about to page ... so it's safe in Bank 2 and can't be ... it'll be slowed by contention). Any interrupt vector tables and ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... to determine whether a RAM bank was contended though you could ... a counter in the RAM bank to test until the next ... I say though, testing for contention is probably overkill, just identify ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... to determine whether a RAM bank was contended though you could ... a counter in the RAM bank to test until the next ... I say though, testing for contention is probably overkill, just identify ... model instead of testing page contention, you are not "testing the ... -
I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…
... a program to avoid "direct" contention with ULA to update the ... , to implement a "kind of bank switching", but for video, by ... />
We would still have contention to access RAM, but we ... -
How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…
...
You can only bank the top 16k of memory ... and this is called contention. If you're trying ... to avoid contention to run timing critical ... in a contended memory bank (this means the I ... pointing into a contended bank). This flaw will not ... -
NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... contend at least a 16K bank and that 8K would have ... to re-read the memory contention chapter a dozen more times ... -
Shadow of the Unicorn loader for +2A / +3hi, i have tried to load SotU with the [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0023000"]RAM loader from Fraser Ross[/url], which is l…
I don't see why contention should be a problem. The ... ], 6, [u]3[/u]] and bank 3 is the only uncontended ... is no way of avoiding contention. It doesn't stop anything ... , a 16K Spectrum was all contention, and that could still run ... -
Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…
... treat it as one 16K bank, and give it its own ... copy code from a memory bank down into the 32768..49151 ... run it (to avoid any contention) then compile it with an ... -
128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... in uncontended time. If memory contention kicks in that will slow ... /> You could copy from one bank to the other with a ... OUT to swap from one bank to the other can happen ... -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... underlying reason for the memory contention.
After looking at ... 16K of code into either bank 1 or 3 as they ... -
Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…
... is executing in a contended bank, the machine can crash. ... at a fixed address in bank 0 in the top ... can't page a contended bank into the top 16k ... execute code in a contended bank in the top 16k ... the easy path to avoid contention issues is to place extra ... -
The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... the past by changing the contention pattern to make them run ... requires being in a contended bank in the top 16k.
bank 00 at top of ram ... -
Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
Removing contention would involve a significant change ... been used.
Then bank switching could have been provided ... -
If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... so that there is no contention, in which case you can ... which is bank switched) = 80k bytes. No changes to the contention pattern ... -
If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…
... sure whether to introduce the contention timing to the lower 16k ... on the mainboard, add the bank logic, some ROM changes and ... -
Calling all coding munkeez...Having spent the last 8 years as a Windows application developer I thought I'd try my hand at a bit of Z80 speccy coding - something I missed out on …
... assembler programmer for a major bank - will my experience help with ... -
Spectaculator 2.0 availableHi, I've just released a new version of Spectaculator. It should be on WOS in a few days. Here's a cut 'n' paste from comp.sys.sinclair: Spectacula…
... rewind
o Memory contention and scanline-based multicolour rendering ... -
Dictator:- Friendly high score challenge.............LOL - just for fun, a friendly high score challenge for the 16k game DICTATOR by DK'Tronics. Scoring catagories are as follows. 1) Overall HIGH SCO…
... money stashed in a Swiss Bank Account
3) Most ... have got in a Swiss Bank Account is $980,000. But ... -
Emulation and Debugging functionality[Cut n Paste from the original CSS post] Hi all, I'm currently working on SPIN's debugger, which is coming along nicely. Mostly, it's been devel…
... ,
or from the memory bank of your choice
Registers ... -
Quiz 14(ish)- Giddy up horsey.. whooo! Ok, 10 quick fire questions.. Some cryptic - you`ll have to unravel the clues to get the game name, Some are description of the game. Others are in…
... ?
Claw Line and Cinder Bank are further clues.
Name ... -
ZX Spin 0.3 ReleasedStandard Cut'n'Paste from CSS post again! I can't get to my webpage, so I've uploaded SPIN0.3 to WOS, Alt.Binaries.Comp.Sinclair, and also Daren Pea…
... .
Fixed an \"Emulate Memory Contention\" bug
Added Magnum Lightgun ... -
[NEW]: Spectaculator 4.0Hi everyone, Finally managed to finish it... enjoy! --- [NEW]: Spectaculator 4.0 Spectaculator is a Sinclair ZX Spectrum emulator for PCs runnin…
... />
o Brand new memory contention system and cycle-accurate display ... -
My Name is Uncle Groucho, you win a fat cigar! - help neededHello, Basically I need help in knowing what the f**k I'm doing in this game. It seems to have a "set" selection of commands I can use in a text adv…
... they are, although "bank" got me into the bank.
Please ... -
Name this soccer management gameAny help appreciated. Rgds... Alex Hi, i was wondering if you can help, i am loking for a particular football manager game for the spectrum, i ca…
... />
the transfer market
bank manager
oddly the ... -
ANN: "Sam Revival" magazine issue 7 out now (SamCoupAs there's been a few posts in these forums about the Sam Coup? I thought I would mention that issue 7 of the 'Sam Revival' magazine is out... Insid…
... off with 'MODE 1
Contention' where Simon Owen has carried ... -
Error trying to buy SpectaculatorAfter prosessing the order this error occurs Your transaction failed for the following reason: eSellerate was unable to process your credit card. Pl…
... card. Please contact the issuing bank for information about this card ...
