6581 R4AR?

Parts Questions
1

at first… hello to all!

since a year i take a look at these projects… and i’m suprised every visit… thosten your the buddah under the diyer (for me…)  :) :slight_smile: :slight_smile:

and the community is just great!!!

ok enough blah blah  ;) :wink: :wink:

i bought a c64 over ebay

and as i opened it.. oh wonder oh wonder… i found a chip (beside the 6581) that is called “6581 R4AR”… what means that? is that a other release of the sid chip? i read in a yahoo group (hardsid?) that this is a “advanced revision”???

any suggestions?

keep up the good work!

cheers

agentff6600

2

Hi i found this in the net…

quote--------------------------------------------

I don’t know the ROMs, but

> I also found a 6581R4. The strange thing is that all my other 6581’s are

> marked as “6581” only. What do I have here?

Several SID revisions were produced during the years. The first batches

didn’t have the ‘R1’ marking on the chip; later ones (from R2) did. You can

also see two different R1 batches (one from Korea, the other from the

Philippines). The R4 is probably from 1986, Hong Kong. The only later 6581

revision I’ve seen is the R4 AR, maybe hinting at 'A’dvanced 'R’esonance

(just thinking loud).

All later 8580 SIDs I’ve seen were from revision 5 (and Hong Kong).

IMHO the R4 batch sounds the best ;-). AFAIK the SidStations were also

equipped with this batch. Its filter sounds very unique, as it gets

saturated from the signal. It sounds very much likely a special analog synth

(…well, since actually, it is :slight_smile: ), giving strong, characteristic, warm

filtered sounds.

Best regards,

quote-------------------------------------------------------------

3

For the records: the SID’s which I own:

  • 1 * MOS 6581 CBM / 3183   (perfect sound, warm filters)
  • 1* MOS 6581 CBM / 2584   (perfect sound, low signal-noise ratio, warm filters)
  • 1* MOS 6581 CBM / 4084   (distorted sound, but nice for fat leads, used in mbsid_demo8.mp3)
  • 1* MOS 8580R5 / 3389 25   (see below)
  • 1* CSG 8580R5 / 4388 25   (see below)
  • 4* CSG 8580R5 / 5092 25   (perfect sound, very high signal-noise ratio, fat filters, see mbsid_v1_5_filter.mp3)

Best Regards, Thorsten.

4

mmh…  ??? ??? ???

probably i must make myself clear…

i found this chip in an c64 with a normal sid chip…

heres a pic

http://scorpius.spaceports.com/~ff6600/sid.jpg

(copy paste the url in a new window, my host don’t allow direct links…)

i’m not shure… but 2 sid’s in one c64?

5

your link doesn’t work…

6

and now…?

http://scorpius.spaceports.com/~ff6600/sid.html