Hallo Peter,

thanks a lot for the new core.
Unfortunately this version seems to break compatibilty to some
vga monitors. :'(
On my Eizo F56 the picture looks rare dark and black & white(50&60Hz).
On the Sony 19" CRT the picture is dark but more recognizeble than on
the Eizo.
On both crts the picture is out of center, much more than before.
Is there a way to get the 0.25 video compatibility back ?

Grüße

Dirk






Peter schrieb:
>
> Hallo Allemaal,
>
> It has been a while since there was an update. During a long 'retro'
> weekend Jens, BeRo and I had the chance to torture the C-One with
> various demos, cartridges, test-programs and oscilloscopes. *)
> The result (after some rework) you can now download as version 0.26
>
> The following items have been fixed/updated:
>
> - Reading from SID chip now implemented. (emulated registers removed)
> - Fixed decimal mode of ARR instruction
> - CPU speed changes together with the video mode if changed by
> pressing F12.
> - Fixed speed of dotclock and phi. System now runs at 0.9850Mhz for
> PAL and 1.026Mhz for NTSC. Most floppy turbo loaders can now operate.
> - VGA frame refresh rate now correct at 50Hz and 60Hz.
> - Catridge port stability improved by adding data register that
> buffers on read.
>
> As you can see many activities have been focused on getting the system
> speed correct. Until now the C-One ran about 8% too fast. With this
> update the system is within 0.5% of the real C64 speed allowing many
> floppy speeders to operate.
>
> The ARR opcode and SID reading fix should satisfy a few extra programs
> out there.
>
> Again sorry for the long delay between the last update. I was working
> on other projects. I have only 2 hands, 1 brain and 1 kitchen table.
>
> The download file 'fpga64_026.zip' is available on my homepage at
> http://www.syntiac.com/c_one.html <http://www.syntiac.com/c_one.html>
>
> or for a complete overview including older versions and test reports
> see: http://www.syntiac.com/fpga64.html
> <http://www.syntiac.com/fpga64.html>
>
> Don't let the bits byte you,
> Peter
>
> *) No 8 bit home computers where damaged or harmed while developing
> this core version!
>
>