At http://www.msx.org/forumtopic6516.html
I had new light on the way of working of the VDP

The possiblitity of haveing in scr2 both Pattern Generator Table
and the Pattern Color Table of 2Kbyte (instead of 6Keach) is very
important as it frees 8K of VRAM that can be used for other purposes

Maybe I have some more to discover :-)

Is it possible to move Pattern Generator Table
and the Pattern Color Table in order to piunt to addresses different
fron 0000h and 2000h ?

With 8K free, it woud be possible to have multiple tile sets
(i.e. animated tiles at at zero cpu load!)

yes, it is possible... but there's a downside... sprites tend to clone using that mode on the TMS, and it seems someone came across a version of the VDP where in that mode the whole mirroring trick doesn't work... meaning: only the first third is actually displayed.

I can't remember the machine that has that mirroring problem, though...

Also, other Pattern/Color table addresses are not possible.

I have heard of some TMS where this "hybrid" mode has problems.

Let's forget them for the moment, is it possible to move Pattern
Generator Table and the Pattern Color Table in order to point to
addresses different from 0000h and 2000h ?

Quote:

I have heard of some TMS where this "hybrid" mode has problems. Let's forget them for the moment, is it possible to move Pattern Generator Table and the Pattern Color Table in order to point to addresses different from 0000h and 2000h ?

According to the datasheet it's either 0000h or 2000h and some bits have to be set to 1. And if you do otherwise, you probably create an incompatibilty with MSX2 (V9938) and higher.

Here's the datasheet: http://www.msxarchive.nl/pub/msx/mirrors/hanso/datasheets/chipstms9918.pdf

Go and see http://www.msx.org/forumtopic6516.html

Using this mode isn't an MSX incompatibility,
I'd rather say that some flawed TMS aren't MSX compatibile.

In V9938 those modes work correctly, like in the good TMS

SONY MSX1 models do not support this "hybrid" mode: confirmed (personally) on SONY HB-10, HB-20, HB-101, HB-75.

For the sake of the science,

you can wrap both pattern tables and colour tables or one of them separately.

I guess, (confirm if you can) that this occurs when you wrap both colour and pattern tables (correct ? ).

Do you know if the TMS problems occurs when you wrap only pattern table ?
Does it occur when you wrap only the couour table ?

Also having one of the two tables with 2K instead of 6K could help in game development
Does anyone have furter info in this issue ?