UM6502A and UM6522
Riccardo Rubini
last week I ordered from an IC reseller three IC's : two 6522 and one 6502.
I bought this stuff via mail, and the chips were described as being produced
and manufactured by MOS Technologies.
Strangely enough, when I received this morning the package they sent me, I
found one 6502 and two 6522, yeah, but made by another company, namely UMC,
I think.
The IC's have the following written on the top side of 'em :
UM6522 - 8852S
UM6502A - 8941S
I discovered that the UM6502A is a variant / clone of the MOS 6502 running
at 2 Mhz. The question is simple : can I use this CPU into my VIC-20, for
example, or into a 1571 board ? The MOS 6502 in the VIC runs at 1 Mhz so.
What could happen if I substitute it ? Can the UM6502A work at 1 Mhz ?!? I
would think so, but I want a confirm by others.
Also, I am trying to gain some informations on the UM6522 . It seems to be a
VIA as well as the MOS 6522 but I don't know how much is compatible with it.
Anyone could help passing me some additional informations ?
Thanks.
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Riccardo Rubini
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Daniele Gratteri
news:izaG7.23218$zu5.8...@news1.tin.it...
> I discovered that the UM6502A is a variant / clone of the MOS 6502 running
> at 2 Mhz. The question is simple : can I use this CPU into my VIC-20, for
> example, or into a 1571 board ? The MOS 6502 in the VIC runs at 1 Mhz so.
> What could happen if I substitute it ? Can the UM6502A work at 1 Mhz ?!? I
> would think so, but I want a confirm by others.
Dear Riccardo, I have a MOS 6502C (4MHz version) that works into my VIC 20
since it was built! :-)
Also, Ruud Baltissen once sent me an UMC 6502A that was really a fine
replacement for another VIC 20.
There are no problems at all.
> Also, I am trying to gain some informations on the UM6522 . It seems to be
a
> VIA as well as the MOS 6522 but I don't know how much is compatible with
it.
Don't know about this, I'm sorry.
--
____
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Clockmeister
"Riccardo Rubini" <riccardo....@yyytin.it> wrote in message
news:izaG7.23218$zu5.8...@news1.tin.it...
> Hello,
>
> last week I ordered from an IC reseller three IC's : two 6522 and one
6502.
> I bought this stuff via mail, and the chips were described as being
produced
> and manufactured by MOS Technologies.
>
> Strangely enough, when I received this morning the package they sent me, I
> found one 6502 and two 6522, yeah, but made by another company, namely
UMC,
> I think.
>
> The IC's have the following written on the top side of 'em :
>
> UM6522 - 8852S
> UM6502A - 8941S
>
> I discovered that the UM6502A is a variant / clone of the MOS 6502 running
> at 2 Mhz. The question is simple : can I use this CPU into my VIC-20, for
> example, or into a 1571 board ? The MOS 6502 in the VIC runs at 1 Mhz so.
> What could happen if I substitute it ? Can the UM6502A work at 1 Mhz ?!? I
> would think so, but I want a confirm by others.
CPU's will run fine at a lower speed then they are rated at, it should work
no problem at all. UMC clone a lot of IC's, the 6502(A) being one of them.
> Also, I am trying to gain some informations on the UM6522 . It seems to be
a
> VIA as well as the MOS 6522 but I don't know how much is compatible with
it.
>
I see the UMC6522 listed as a peripheral VIA rated at 1Mhz, 40 pin DIL...
I think you'll find it a MOS 6522 clone and more then likely 100%
compatible.
Regards,
Clockmeister.
Amiga hacking resources, rare manual downloads and Amiga schematics...
Miika Seppänen
<gerr...@tnet.com.au> wrote:
>I think you'll find it a MOS 6522 clone and more then likely 100%
>compatible.
>
Few years ago I bought one to fix my VIC-20 (now dead again, maybe the
CPU this time.) That was made by Rockwell (look at
http://www.sci.fi/~miksukka/Kuvat/VICvasen.jpg, if interested) and it
worked perfectly. I guess they'd have renamed the model (to something
else than 6522), if they wouldn't be compatible.
-Miika
Riccardo Rubini
"Miika Seppänen" <miika.s...@saunalahti.fi> ha scritto nel messaggio
news:2ftiut833pdvfgnd4...@4ax.com...
Hi Miika,
tnx for reply. I guess that now I have discovered something - naive me! - I
didn't know before. There are some MOS compatible semiconductors around
there. My question now is : how to trace them ?
For example : it would be possible that UMC and/or Rockwell made 6526 VIA
clones as well ; as well as 6510 clones. I guess that UMC made that chip
with VIC compatibility in mind...
Did Rockwell create a 6502 clone adaptable to the VIC 20 and 100% compatible
? And what about the C64 and the 6510 ? Are there any Rockwell clones as
well ?
Riccardo Rubini
"Daniele Gratteri" <viva...@libero.it> ha scritto nel messaggio
news:9sbgfs$12g7rj$1...@ID-23382.news.dfncis.de...
Ciao Daniele!
>Ruud Baltissen once sent me an UMC 6502A that was really a fine
> replacement for another VIC 20.
Dear Daniele, thanks for good news ! This is absolutely good news, I thought
I wasted my money on something I couldn't have used for my puropse.
> There are no problems at all.
>
That's great to hear!
> Don't know about this, I'm sorry.
>
It seems is 100% compatible as well ... Grazie Daniele, alla prossima ;-)
Christer Palm
>
> tnx for reply. I guess that now I have discovered something - naive me! - I
> didn't know before. There are some MOS compatible semiconductors around
> there. My question now is : how to trace them ?
>
> For example : it would be possible that UMC and/or Rockwell made 6526 VIA
> clones as well ; as well as 6510 clones. I guess that UMC made that chip
> with VIC compatibility in mind...
>
> Did Rockwell create a 6502 clone adaptable to the VIC 20 and 100% compatible
> ? And what about the C64 and the 6510 ? Are there any Rockwell clones as
> well ?
>
Actually, they're not clones most of the time, but the real thing.
To avoid supply shortage it's (or at least was) common for chip
manufacturers to make so called second source agreements where they
exchange the rights to manufacture the more popular chips. In addition,
it is common for some manufacturers to buy the rights to manufacture
old, but popular, chips for the "aftermarket".
Rockwell and Synertek used to be second source partners to MOS
Technology/CSG. However, I doubt that the 6510 and the 6526 are/were
ever available from other manufacturers, because they were never widely
used in the same way as the 6502 and the 6522 for example.
As far as I understand it, MOS Technology more or less completely went
off the market after they were bought by Commodore, to exclusively
manufacture chips for use in the Commodore product line. CBM were
obviously not primarily looking for extending their business into
commercial chip-making (which was probably a wise decision).
--
Christer Palm
Daniele Gratteri
news:_kfG7.24127$zu5.8...@news1.tin.it...
> Dear Daniele, thanks for good news ! This is absolutely good news, I
thought
> I wasted my money on something I couldn't have used for my puropse.
I am happy to know you haven't wasted money.
> That's great to hear!
:-)
> It seems is 100% compatible as well ... Grazie Daniele, alla prossima ;-)
That's fine. Ciao!
P.S. where you find these ICs? In Italy or not?
Daniele Gratteri
news:iwcG7.41$Tw....@nsw.nnrp.telstra.net...
> I see the UMC6522 listed as a peripheral VIA rated at 1Mhz, 40 pin DIL...
>
> I think you'll find it a MOS 6522 clone and more then likely 100%
> compatible.
I have a 65C22 into one of my two VIC 20s manufactured by GTE. It is a
replacement (I had to install it in place of an original MOS one since I had
problems with the keyboard) and works fine.
Do you know if there are 6522s that runs at 2MHz (6522A)?
Anders Carlsson
> CBM were obviously not primarily looking for extending their business
> into commercial chip-making (which was probably a wise decision).
Given how many other odd decisions and choices they made (although
almost one decade later -- didn't they aquire MOS in 1977 or so?),
it hadn't surprised me if they had made other chips available too.
Maybe the HardSID had been realized in 1985 if they had... years
before SoundBlaster and the other. ;-)
--
Anders Carlsson
Alex Eisenhut
> tnx for reply. I guess that now I have discovered something - naive me! - I
> didn't know before. There are some MOS compatible semiconductors around
> there. My question now is : how to trace them ?
>
Macs used 6522s.
Overdoc
Daniele Gratteri schrieb in Nachricht
<9sc7ag$1295kr$1...@ID-23382.news.dfncis.de>...
>
>Do you know if there are 6522s that runs at 2MHz (6522A)?
>
Yes, they exist. I have one working in one of my 1541 because of
Prologic-Dos ( cool hardware speeder :) ), which raises the 6522's clock to
2MHz. You can also run a normal 6522 at 2 MHz, but then you should keep it
cool to avoid overheating and therefore malfunctioning.
I think most 6522 from later production were in fact 6522A.
Overdoc
Mike Gregory
I think you will find that the 6510 and 6526 were Commodore specific
and only made by Mos.
The 6502 and 6522 were made by many different chip makers. They are
not guaranteed to be 100% compatible, only about 99.99%. You may for
example find that unimplimented opcodes do not work quite the same,
but all the proper opcodes work identically.
Mike G
Leinonen Mika
>Few years ago I bought one to fix my VIC-20 (now dead again, maybe the
>CPU this time.) That was made by Rockwell (look at
>http://www.sci.fi/~miksukka/Kuvat/VICvasen.jpg, if interested) and it
>worked perfectly. I guess they'd have renamed the model (to something
>else than 6522), if they wouldn't be compatible.
There is at least one execption I have read about:
The CMOS 65C22 from Western Design Center doesn't have an open drain
*IRQ line that could be wire-or'ed. Rockwell's 65C22 can be.
peter karlsson
> Maybe the HardSID had been realized in 1985 if they had... years
> before SoundBlaster and the other. ;-)
Wasn't there a SID based PC soundcard available in the late 1980s? I
believe I read something about something like that in SHN back then.
Might have been vapourware, though.
--
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Ruud Baltissen
> There is at least one execption I have read about:
> The CMOS 65C22 from Western Design Center doesn't have an open drain
> *IRQ line that could be wire-or'ed. Rockwell's 65C22 can be.
Don't think so, would be against the whole concept of the way the IRQ-line
should be used. It also would mean it could not replace any existing 6522
ie. nobody would be interested in buying it.
___
/ __|__
/ / |_/ Groetjes, Ruud
\ \__|_\
\___| http://Ruud.C64.org
Miika Seppänen
wrote:
>Wasn't there a SID based PC soundcard available in the late 1980s? I
>believe I read something about something like that in SHN back then.
>Might have been vapourware, though.
Yes there was, "Innovation" or something like that. I've seen only one
game supporting that card, the PC-version of Ultima VI.
-Miika
Riccardo Rubini
"Christer Palm" <pa...@nogui.se> ha scritto nel messaggio
news:3BE9A660...@nogui.se...
> As far as I understand it, MOS Technology more or less completely went
> off the market after they were bought by Commodore, to exclusively
> manufacture chips for use in the Commodore product line. CBM were
> obviously not primarily looking for extending their business into
> commercial chip-making (which was probably a wise decision).
>
> --
> Christer Palm
Hola Chris!
I think you're absolutely right. And in support to your theory I can bring
my experience of phoning a hundred IC resellers in Italy and finding only
C64 or VIC-20 custom chips, if ever. I always ask for "MOS" chips, but
nothing strange ever showed.
Lately I bought 4 1571 motherboards (one came from a 1570 and is modified to
suit that peripheral ) . Here's what I've found on them in the place of a
MOS 6522:
CMD G65SC22P-2 and GTEG65SC22P-2
The strange thing is that these chips are _soldered_ straight on the board,
without any socket, so I think that CBM was using also compatible
third-party integrated circuits.
This makes me wonder...Why did CBM bought IC's from third party and not used
MOS/CSG IC's ?!?