[sdiy] Waveform data wanted

[Needham, Alan]

Hello Chris!

VCDO ...
I created a similar spreadsheet, but with each wave on its own plot and
split as per the original 'group' and 'wave' selection switches.
http://sonicsheep.com/Synthesisers/VCDORomWaves.xls

When I plotted this I made a note that...

"Group 4, wave 3, a falling sawtooth has one bad byte near the end.
A decimal 10 appears where it should be 13." - corrected on this plot
(the way I split the waveforms puts that on tab "Group 4a", series 3).

That puts it between addresses 1729 and 1793 -- 4 bytes from end,
address 1789 (all decimal) or spreadsheet tab 'VCDO ROM Print' cell
27-BI. This seems to be beyond the spreadsheet dataset you have.

The above was based on my copy of the ROM which is at
http://sonicsheep.com/Synthesisers/vcdorom.bin which still contains that
bad byte.

SDIY 2009 coming soon! room booked back in January.
	I'm hoping to take something different ;-)

	Alan - better stop chatting and get soldering!


-----Original Message-----
From: Chris Strellis [mailto:Chris.Strellis at crystalvision.tv] 
Sent: 15 June 2009 14:10
To: Needham, Alan; Tom Wiltshire; SDIY DIY
Subject: RE: [sdiy] Waveform data wanted

Hi Alan,

(I remember playing with you ETI4600 you brought in to SDIY UK 2008).

> Digisound ROM ...
> I remember wading through that to plot the waveforms - ONE (I forget
> which- Ill look it up) has a bad byte in the copy I have - anybody
else
> seen that?

I don't know about a bad byte?

I've made an Excel spreadsheet of the wave data here:

http://www.strellis.com/Download/VCDOROM.XLS

>From the first column people can recreate the binary image for the EPROM
if they wish.

Cheers

Chris
http://www.strellis.com

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