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ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... >=0xC000 and a contended bank pages in.
- A port ... there in Z80 flags and contention
- Makes [URL="http://www ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... ;308952]I can solve the contention issue by paging in shadow ... contended (even if it is BANK 7 paged in at 0xc000 ... /> I wouldn't worry about contention too much though, so long ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... ;308952]I can solve the contention issue by paging in shadow ... contended (even if it is BANK 7 paged in at 0xc000 ... /> I wouldn't worry about contention too much though, so long ... -
Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... not suffer any kind of contention. A program run within the ... , the Inves has only one bank composed by two 41464 memory ... -
Knight Lore on c64.. after 25 years..It seems that Knight Lore coming on commode a quarter century after speccy version. ;) Well, better late than never.. The game is still in developmen…
... C64 uses for things like bank switching so it's unsafe ... 4mhz bus, so no DMA contention) on a machine with a ... -
Knight Lore on c64.. after 25 years..It seems that Knight Lore coming on commode a quarter century after speccy version. ;) Well, better late than never.. The game is still in developmen…
... C64 uses for things like bank switching so it's unsafe ... 4mhz bus, so no DMA contention) on a machine with a ... -
Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
... your screen writing routines in bank 2. Page the screen ... . Store the data in bank 5 at 0x4000. When ... put the interrupt routine in bank 2 as well. That ... (after the screen in bank 5). You could use ... have to consider the contention differences between the early ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... the contention handling for IO where a contended memory bank is paged ... understood the circumstances when IO contention is applied to the 0x7ffd ... -
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…
... />
My advice, make the bank contention model switchable - either a jumper ... -
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…
... ;581997]My advice, make the bank contention model switchable - either a jumper ... -
Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…
... always in an uncontended RAM bank. I'm not sure if ... /> All the rest of the contention stuff could be wrong though ... -
SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... .5MHz Z80 core with memory contention and other artifacts can be ... looking that way. A few bank holidays coming and I might ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... to move the code to bank 2 also.
Anyway ... started to read how 128K contention works...
As soon ... -
Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…
... ??[/QUOTE]
The different contention just means that timing critical ... be running in an uncontended bank gets screwed up on the ... may still have the wrong contention). -
Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…
[QUOTE=aowen;631304]The different contention just means that timing critical ... be running in an uncontended bank gets screwed up on the ... may still have the wrong contention).[/QUOTE]
Yes, and ... -
Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…
... />
[QUOTE]
Setting BANK 7 as the screen by ... . The screen memory in bank 7 is a 49152, ... I need to page to BANK 7, and tinker with ... start to generate screen so contention does not occur
... it different way) page bank and switch screen on one ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... 16KB RAM. You choose which bank shadows the Spectrum's lower ... and separately, you choose which bank is actually renders to the ... would this reduce the ula contention and video ram to 6k ... to ensure it emulates the contention and output rasterisation exactly.
Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... in RAM (does lower RAM contention affect it a great deal ... you need more RAM, use bank switching of the 128k. Nowadays ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
[QUOTE=stephenw32768;722860]Does contention come into play when writing ... executing code in a contended bank, your execution time will vary ... out all tape loaders), the contention delay is unpredictable. You won ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... a buffer in a contended bank of the 128 if I ... a block of bytes outside contention, use [B]LDI[/B]. If ...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... , you have missed the point. Contention doesn't depend only on ... a buffer in a contended bank of the 128 if I ...Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... 't know about 2nd 16k bank video contention when I wrote FK ...128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... support for more than one bank of 64K ram for paging ... memory contention applies to every memory access regardless of which bank it ...Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... to fake the effects of contention via the clashbasher by using ... ULAplus ULA fitted ie double contention. :o[/quote]
Given that ... ? (The Timex modes in Bank 5 or Bank 7 of 128 RAM ...128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
[QUOTE=joefish;771159]Somewhat confusingly, but logically, you can also page Bank 5 (the normal screen) in at the top of memory[/QUOTE]
When Bank 5 is paged in at $c000, do writes to $c000 have contention or not?128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
[QUOTE=FrankT;771180]When Bank 5 is paged in at $c000, do writes to $c000 have contention or not?[/QUOTE]Yes, they do.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 ...
