Search found 4098 matches

by exxos
Wed Oct 25, 2017 9:50 pm
Forum: INTRODUCE YOURSELF
Topic: Hi from France
Replies: 4
Views: 552

Re: Hi from France

I'm frost of sector one. I'm credited for some code in three demos by Dune+Sector One. I did a break regarding Atari stuff some years and I'm regularly trying to catch up but I always end having too much work to have faith to stay behind a computer for fun stuff. I know how to solder and I'm now tr...
by exxos
Tue Oct 24, 2017 11:10 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 7572

Re: ST SHIFTER operation ?

Well ... if you're redesigning the Shifter then 32MHz MMU can feed 320*200*256 ... :) The question then becomes whether to hardcode a 256 color chunky byte mode (preferable, I think) or find space for 256 palette registers :) Which uses less bytes for 256 colours, bit planes or chunky ? Could be st...
by exxos
Tue Oct 24, 2017 8:15 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 7572

Re: ST SHIFTER operation ?

keli wrote:
Tue Oct 24, 2017 7:24 pm
... or you could use the extra bits to support 65536 colors similar to how the infamous dual shifter mod mentioned in another thread supports 32768 ;)
True :) I don't think extending the colours more going to be that useful as we are still limited to 16 on screen anyway :)
by exxos
Tue Oct 24, 2017 6:25 pm
Forum: DISPLAYS & CONVERTERS
Topic: NEC MultiSync EA190M
Replies: 2
Views: 1326

NEC MultiSync EA190M

Bought myself one of these cheap second-hand as I needed a high-res monitor... Out of the box, the default settings are pretty awful. You can see clearly there is scaling issues... IMG_1928.jpg The only way to fix this is to manually alter the horizontal width.. IMG_1934.jpg You can see the banding ...
by exxos
Tue Oct 24, 2017 5:48 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: How to get TOS to see the 1.44MB drives
Replies: 22
Views: 2380

Re: How to get TOS to see the 1.44MB drives

Maybe the density select switch is faulty ?
by exxos
Tue Oct 24, 2017 5:46 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 7572

Re: ST SHIFTER operation ?

I see you're using and storing all 16 bits from the data bus, but on the ST, only 9 bits are stored (12 if you want to support 4096 colors like on the STE.) Since you're building this on a programmable device (and not discreet components), couldn't you save some space by only using 12 bit wide RAM ...
by exxos
Tue Oct 24, 2017 3:33 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 7572

Re: ST SHIFTER operation ?

b15.png This is one colour register block. There will be 16 of these each of the colour registers. Though as the circuit is rather large, I will convert these is a block symbol for my schematic later. Basically on the top left is the databus, below that some select lines, and to the bottom right th...
by exxos
Tue Oct 24, 2017 11:50 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 3977

Re: Choosing between three Sony MPF-920 drives

So with TOS 206 & TOS 104 with the floppy write protected, without any mods to the drive, initially the programme says disk has definitely not changed, the when the floppy drive motor turns off, it says disk may have changed. So would see media detect works perfectly well here. However with the flop...
by exxos
Tue Oct 24, 2017 11:36 am
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: Choosing between three Sony MPF-920 drives
Replies: 35
Views: 3977

Re: Choosing between three Sony MPF-920 drives

The preliminary conclusion is then perhaps that with a Mega STe at least I will still need to have CTIN shorted on a Sony MPF-920 drive while with a normal ST (such as my STe) and the version 6 Exxos HD module board I might not (as the HD module takes care of everything). I'm soon going to attend t...
by exxos
Mon Oct 23, 2017 11:59 pm
Forum: TWEAKS & FIXES
Topic: SR98 PSU GETS MORE LOVE
Replies: 7
Views: 1735

Re: SR98 PSU GETS MORE LOVE

Well, replacing a crappy capacitor with another new crappy capacitor still doesn't seem good :P If anything a 1uF ceramic would be better. I didn't experiment much noting the regulation IIRC.. you could compare a 1uF and 500nF and check the ripple on a scope and see which value works better. Lower v...