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Hi, for maybe it could help ... I upload here a zip containing the source code of a program that shows this noise when run on a Dragon 32/64, at the same time I include an VDK file to create a disk if desired. The program will also run on a CoCo2 Thanks beforehand pere JOYSTK.ZIP Ps I copied the Joy...

Hello Ciaran, I wanted to give a chance to the games I am converting to take advantage of any HD6309 installed in place of the std MC6809 The code is fairly simple: Set6309 fcb $10,$86,$55,$55 ; ldw #$5555 fcb $1f,$61 ; tfr w,x cmpx #$ffff ; did it fail? beq ES6309 ; yes, skip next fcb $11,$3d,$01 ;...

Hello, I am using the right joystick to move a sprite on screen and to check the two axis I am not using the Basic ROM. The problem is that I hear no noise at all on XRoar while moving the joysticks ... But on the real machine I can hear a noticiable noise level. I had a look at the code used by Tan...

Hi Ciaran, sorry for getting back so late :-( Finally I got one unexpanded Dragon32 and put it on the desk. Using the CoCo-SDC I have loaded an VDK that contains a program that verifies if the machine has RAM in the area $C000-C001 and in case the written word doesn't match the contents of these two...

HI Ciaran, I forgot to say that this last test is a clear demonstration that the write commands don't get their goal, instead the lower RAM is modified copying there the pre-existing value from the pointed byte of ROM. But then, when the program 'reads' the ROM still in MAP1, the data it receives is...

Hi Ciaran, I tested your idea ... and this is the result: Test_Result.jpg The code used is this one: ; --------------------------------------------------------------------- org $3300 put $3300 ; --------------------------------------------------------------------- orcc #$50 ; disable interrupts sta ...

Hi Ciaran, thanks one more time for your explanation. I will try writting to $8400 on ... it's a very clever idea! I will need more time to test it in a real Dragon32 as on my desk there are a D64 and a Tano for testing purposes ... but will be done. It is not that important for the project I am wor...

Hello Ciaran, I have tested it some more times getting always the very same result. The RAM cell $c000 is overwritten despite the program has switched to MAP1 and the emulation expects to work with a 32K machine. For maybe there is something wrong in my bat file that starts XRoar I include it here. ...

sixxie wrote: Released!

I have downloaded v35.1 and tested the same program I was using without changes ...
The result is the same, $c000 gets modified and so the compare finds equal values
wich should not happen on real hardware.
cheers
pere

Hmm, you're right that it wouldn't happen as you describe. It looks like I've introduced a bug somewhere along the line. What should happen if you write to addresses >= $8000 in map type 1 on an unexpanded Dragon 32 is that the value from ROM usually at that address will be written to the aliased l...