... [/i] of waitcycles to any contended memory (aka screen) accesses :-)

... be able to detect a contended memory access, and will cause garbage ...

... see anything about how the memory is mapped out ? What I ... Data
0xOFFSET2+1 - 0xOFFSET3 : Contended Memory
0xOFFSET3+1 - 0xFINAL : User ... Memory

etc

...

... see anything about how the memory is mapped out ? What I ... + attribute) which is also the contended memory.
32768 to 65535 is ... /> The spectrum manual has a memory map if you wish for ...

... right. I inadvertently clubbed contended memory with the display memory. :)

[QUOTE ...

... ROM
0x4000-0x7FFF (Contended) User RAM
0x8000-0xFFFF ...

Within the contended user RAM:

... screen data from this particular memory chip (or chips), ... certain times. This is the 'contended memory'.

The remaining ...

... 't run the code in contended memory, and coding a loop with ...

... mode, with RAM bank 4 (contended memory) in 0x0000-0x3FFF, and place ...

... LDIR opcode is running in contended memory or not;
[*] whether the ... Source (HL) is pointing to contended memory or not;
[*] whether the ... Destiantion (DE) is pointing to contended memory or not;
[/list]

... to note is that contended memory is not actually contended until the ULA ...

And copying from and to contended memory is a real time-waster. ... Buffer the screen in non-contended memory and always copy from that ... to scroll the store in memory. You can use it as ...

... ROM). The problem is that contended memory access isn't just slow ... square-wave tone channels) in contended memory. It sounds pretty funny!

... ROM). The problem is that contended memory access isn't just slow ...

... square-wave tone channels) in contended memory. It sounds pretty funny![/QUOTE ...

... the interrupt routine in a memory area that isn't bankswitched ... table will reside in non-contended memory, somewhere in the address space ... words: 1st update the shared memory copy, then do the actual ...

... , you really get hit by contended memory.

(The one I ...

... ULA timings except for the contended memory -> [url]http://translate.google ...

... it won't run in contended memory (e.g. where your flash ...

... it won't run in contended memory (e.g. where your flash ...

ROM loading DOES work in contended memory with some adjustments. I have ... have the ROM in non-contended and the regular screen visible ...

... seems to be pointing to contended memory ,

ok how do ...

but what physical IC no's are the contended memory ?

... IC no's are the contended memory ?[/QUOTE]

... 24 are non-contended memory, while IC25-32 belong to contended memory.
... be bit 0 of non contended memory, IC24 would be bit ... of non contended memory, IC25 would be bit 0 of contended memory, and ...

... /> There are two physical memory banks: contended and not contended. Each chip inside ... are stored in the non contended memory bank. Pages 1,3,5 ... 7 are stored in the contended memory bank.

So, ... certain address range of all memory chips of the bank ...

... 16K Spectrums or in low, contended, memory on other models.
[/LIST ...

... ://scratchpad.wikia.com/wiki/Contended_memory]Contended memory[/url]" article on the [url ...

... 16K Spectrums or in low, contended, memory on other models.
[/LIST ...

... I started dealing with the contended memory model I added Kendall's ...

While I think on, if anyone's interested in hearing the ROMBeep engine, [url=http://dl.dropbox.com/u/7642722/Sweevo_rombeep.tap]here's a TAP file[/url] of the tune from Sweevo's World, playing from contended memory at 25000.

... Sweevo's World, playing from contended memory at 25000.[/QUOTE]