And it's also not easy to write a program in C# (for a customer in France), when the documentation is also written in French
Siggi
And it's also not easy to write a program in C# (for a customer in France), when the documentation is also written in French
This using the lower bit of the I register is a cool trick, remember the low bit isn't used under normal conditions $1E can be $1F with no ill effectsirmorris wrote: ↑Fri Feb 23, 2018 3:21 pm
Under normal circumstances you cannot replace the ROM at 0000-0fff with the shadow RAM because the I register needs to be set to $1E in order for the character generator to work. If you change I register then the characters on screen will be messed up, psuedo hires.
Does Wilf Rigter's article on memory have any indication bearing on how this could be done with switching of ram location using (instead of being victim to ) ghosting feature of RAM/ROM chip select?All Pokes are sent to the buffer... how replace the main rom.
The HRG Rom is located at &2000, and can't be the buffer Ram // or // the poked byte is redirect in a ram at the same location..
I assume this will only work when the Memotech HRG is connected. Otherwise it would be cool to use the internal 1k for ROM customization.Andy Rea wrote: ↑Fri Feb 23, 2018 6:35 pmThis using the lower bit of the I register is a cool trick, remember the low bit isn't used under normal conditions $1E can be $1F with no ill effectsirmorris wrote: ↑Fri Feb 23, 2018 3:21 pm Under normal circumstances you cannot replace the ROM at 0000-0fff with the shadow RAM because the I register needs to be set to $1E in order for the character generator to work. If you change I register then the characters on screen will be messed up, psuedo hires.
so this is pretty cool idea and maybe could be extended to cover the entire 8K range to allow for complete customized rom that you can load in from your favorite storage device...
regards Andy
In the 0-8K range? With a new chip select memory decoder for internal ROM RAM using techniques like Wilfs? Forcing ROMCS low?I assume this will only work when the Memotech HRG is connected. Otherwise it would be cool to use the internal 1k for ROM customization.