15 Dec
2008
15 Dec
'08
5:43 p.m.
On 12/15/08, Keith <keithvz at verizon.net> wrote:
William Donzelli wrote:
Tell me about it. I've been looking for 1Mx4-bit 20-pin DIP DRAMs for
years. The closest I've come is some 26/20-pin surface mount.
I have, too... I need 4 of them to upgrade my Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
<http://amiga.resource.cx/manual/Rejuvenator_AgnusInstall.pdf>
It's never been critical, so I've never bothered, but with the Sprit
InBoard and the Starboard on the side (w/StarDrive SCSI interface), it
would be a nice boost.
Worst case, if I ever did start using my A1000 and really, really
wanted it, I suppose I could cobble a daughter card up that would plug
into the RAM bank on the Rejuvenator, but that's a lot of work for a
very optional upgrade.
-ethan
-ethan
...Why
dont people collect i1103's ?
They do. Some of the early RAM fetches HUGE money. Multiple hundreds
for some of the real raries. 
15 Dec
15 Dec
7:15 p.m.
I have, too... I need 4 of them to upgrade my
Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
<http://amiga.resource.cx/manual/Rejuvenator_AgnusInstall.pdf>
411000s? I have lots of these stashed somewhere. I could send you, but
I'm in Brazil and these are by no means rare...
7:24 p.m.
On 12/15/08, Alexandre Souza <alexandre-listas at e-secure.com.br> wrote:
Not 411000s - those are 1Mx1s unless I'm quite mistaken. I have a
small pile of those. What I need (as mentioned in the subject line)
is 1Mx4, perhaps known as 441000s, perhaps by other numbers; and I
agree with Keith that they are uncommon in DIP format (which is what
the Rejuvenator is prewired for - remove 8 256Kx4 DIPs, install 4 1Mx4
DIPs).
-ethan
I have, too...
I need 4 of them to upgrade my Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
<http://amiga.resource.cx/manual/Rejuvenator_AgnusInstall.pdf>
411000s? I have lots of these stashed somewhere. I could send you, but
I'm in Brazil and these are by no means rare... 
7:32 p.m.
On 15 Dec 2008 at 19:24, Ethan Dicks wrote:
Not 411000s - those are 1Mx1s unless I'm quite
mistaken. I have a
small pile of those. What I need (as mentioned in the subject line)
is 1Mx4, perhaps known as 441000s, perhaps by other numbers; and I
agree with Keith that they are uncommon in DIP format (which is what
the Rejuvenator is prewired for - remove 8 256Kx4 DIPs, install 4 1Mx4
DIPs).
Weren't those used on some 1Mx8 SIMMS?
Cheers,
Chuck
7:55 p.m.
On 12/15/08, Chuck Guzis <cclist at sydex.com> wrote:
On 15 Dec 2008 at 19:24, Ethan Dicks wrote:
Perhaps there were in the early days, but I don't recall many SIMMs
with DIPs, and those I do recall had 9 chips, not 3. There was this
cycle of lots of smaller chips rather than few large chips, then the
economic balance would tip, but that started with 256K SIMMs.
It's also possible that there were some early 72-pin SIMMs with DIPs
(thus needing to be 32 or 36-bits wide, favoring 4-bit-wide RAMs), but
most I remember seeing were covered in SOJ packages.
-ethan
Not 411000s - those are 1Mx1s unless I'm
quite mistaken. I have a
small pile of those. What I need (as mentioned in the subject line)
is 1Mx4, perhaps known as 441000s, perhaps by other numbers; and I
agree with Keith that they are uncommon in DIP format...
Weren't those used on some 1Mx8 SIMMS? 
8:09 p.m.
On Mon, 15 Dec 2008, Ethan Dicks wrote:
Perhaps there were in the early days, but I don't
recall many SIMMs
with DIPs, and those I do recall had 9 chips, not 3. There was this
cycle of lots of smaller chips rather than few large chips, then the
economic balance would tip, but that started with 256K SIMMs.
Many early SIMMs were DIP based. One popular configuration was two 1Mx4
DIPs, or two 1Mx4 DIPs plus a 1Mx1.
They were even available socketed! (to use the DIPs that are now getting
scarcer)
The 9 DIP SIMMs were generally thought to be more reliable.
16 Dec
16 Dec
5 a.m.
Not 411000s - those are 1Mx1s unless I'm quite
mistaken. I have a
small pile of those. What I need (as mentioned in the subject line)
is 1Mx4, perhaps known as 441000s, perhaps by other numbers; and I
agree with Keith that they are uncommon in DIP format (which is what
the Rejuvenator is prewired for - remove 8 256Kx4 DIPs, install 4 1Mx4
DIPs).
Ops, sorry! :) I though 441000 and wrote 411000 :) As I told you, these
are (were?) very common memories. I have a bunch here, drop me a mail if you
are unable to find it anywhere.
10:29 a.m.
Alexandre Souza wrote:
Unfortunately, I think 441000 is 4Mx1 instead of 1Mx4.
The info I have on the chips I need (and it sounds like Ethan needs):
20-pin DIP memory chips
(16) 1meg x 4-bit dips make up a bank of 8mb.
Should be 60-ns
Fast Page Mode
non-parity
An example would be Toshiba TC514400AP-60.
Other manufacturers might use the following base part numbers:
Fujitsu MB : 814400
Goldstar GM : 71C4400
Hitachi HM : 514400
Hyundai HY : 514400
Micron MT : 4C4001
Mitsubishi M5M: 44400
Can anyone verify that 441000 is 4Mx1 ?
Thanks
Keith
P.S. I'm not picky. If someone has 80ns chips with no FPM (would that
be edo?) that would work too! :)
Not 411000s -
those are 1Mx1s unless I'm quite mistaken. I have a
small pile of those. What I need (as mentioned in the subject line)
is 1Mx4, perhaps known as 441000s, perhaps by other numbers; and I
agree with Keith that they are uncommon in DIP format (which is what
the Rejuvenator is prewired for - remove 8 256Kx4 DIPs, install 4 1Mx4
DIPs).
Ops, sorry! :) I though 441000 and wrote 411000 :) As I told you,
these are (were?) very common memories. I have a bunch here, drop me a
mail if you are unable to find it anywhere.
15 Dec
15 Dec
10:45 p.m.
On Mon, Dec 15, 2008 at 5:43 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
I've got some TC514258AP-80's (20-pin DIP), originally from the fast
RAM of my A3000 (replaced by ZIL (Zig-zag in-line?) chips). Those what
you need? I think they're only 256kx4.
Joe.
--
Joachim Thiemann :: http://www.tsp.ece.mcgill.ca/~jthiem
Tell me about
it. I've been looking for 1Mx4-bit 20-pin DIP DRAMs for
years. The closest I've come is some 26/20-pin surface mount.
I have, too... I need 4 of them to upgrade my Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
11:35 p.m.
On 12/15/08, Joachim Thiemann <joachim.thiemann at gmail.com> wrote:
On Mon, Dec 15, 2008 at 5:43 PM, Ethan Dicks
<ethan.dicks at gmail.com> wrote:
I've got some TC514258AP-80's (20-pin DIP), originally from the fast
RAM of my A3000 (replaced by ZIL (Zig-zag in-line?) chips). Those what
you need? I think they're only 256kx4.
Those _are_ 256Kx4 (1Mbit) and that's what I have eight of in my
Rejuvenator now. What I need to upgrade is four 1Mx4 (4Mbit) chips,
and, as a couple of us have been saying, those are somewhat uncommon.
Save yours for another Amiga, though - 514258s are, IIRC, "static
column" DRAMs and were not as common as 514256s (or 44256s, etc).
There is a measurable performance difference in an Amiga 3000 with
"plain" DRAMs vs "static column" DRAMs (5%? 10%?) AFAIK, they will
work in an A2091 (and other Amiga memory boards) or some older ISA VGA
cards as regular 256x4 chips.
I already have a few 256Kx4 chips - we used to populate our VAXBI
COMBOARDs with 2MB of them, as did many Amiga A2091 and A590 owners
(and a few PC owners, IIRC). Those chips aren't too hard to find in
DIP packages. By the time 4Mbit dice were being produced, memory had
largely (but not entirely) moved on to SMT packaging.
-ethan
Tell me
about it. I've been looking for 1Mx4-bit 20-pin DIP DRAMs for
years. The closest I've come is some 26/20-pin surface mount.
I have, too... I need 4 of them to upgrade my Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
16 Dec
16 Dec
10:20 a.m.
Ethan Dicks wrote:
I have, too... I need 4 of them to upgrade my
Rejuvenator in my Amiga
1000 from 1M of CHIP RAM to 2M of CHIP RAM (that and a "Fatter Agnus",
but those aren't as difficult to find as the RAM itself).
I'm looking to upgrade a VXL-30 RAM expansion card from 2MB to 8MB.
Requires 16 of those 1Mx4 chips.
Keith
5698
days inactive
5699
days old
10 comments
6 participants
participants (6)
-
alexandre-listas＠e-secure.com.br -
cclist＠sydex.com -
cisin＠xenosoft.com -
ethan.dicks＠gmail.com -
joachim.thiemann＠gmail.com -
keithvz＠verizon.net