7 Jun
2008
7 Jun
'08
3:13 p.m.
Looking for 1Mx8 EPROMs (27C080 or 27C801)
Eric Smith eric at brouhaha.com
<mailto:cctalk%40classiccmp.org?Subject=Looking%20for%201Mx8%20EPROMs%20%282
7C080%20or%2027C801%29&In-Reply-To=001501c8c898%24e7331d10%24a903a8c0%40andr
ewdesktop>
Sat Jun 7 13:22:24 CDT 2008
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________________________________
Andrew wrote:
If anyone can help out or knows a low cost supplier of
1Mx8 EPROMs, I
They're not at all hard to find, e.g.,
http://www.unicornelectronics.com/IC/EPROM.html
-----REPLY-----
Hi Eric, Thanks for the reply!
Yes, finding new 1Mx8 EPROMs is not difficult but that isn't what I am
asking about.
They only cost about $10 new and are an excellent value, IMO.
However, I am trying to find some low cost *used* EPROM parts to help out
some homebrew SBC builders.
The N8VEM SBC homebrew computer I designed uses the 27C080 or 27C801 for its
boot device/block device/ROM drive.
I'd like to keep the costs as low as possible and am trying to keep the
EPROM at or below $5 each.
OTPs are an option but they are less desireable than the reuseable parts
with UV windows.
As it turns out, most of the people requesting the PCB for building their
own homebrew computer are also requesting the EPROM.
It rather surprised me as I thought more people would have their own EPROM
programmers and erasers.
I have a limited quantity of the 1Mx8 EPROMs on hand but not very many.
At the rate they are going out with the PCBs, I will exhaust my stock
quickly -- long before I run out of PCBs.
In retrospect, that is probably bad planning on my part this is an amateur
project and I am not a professional businessman.
I found a few more 1Mx8 EPROMs on eBay but that doesn't really solve the
problem.
What I need is the 1Mx8 EPROM equivalent to this website:
http://epromman.com/
I have purchased bulk used EPROMs from "Mr. EPROMMAN" before and they are an
excellent value.
Unfortunately, he doesn't carry the 1Mx8 parts. :-/
Thanks in advance if anyone can help.
Andrew Lynch
7 Jun
7 Jun
6:39 p.m.
On Sat, Jun 7, 2008 at 12:13 PM, Andrew Lynch <lynchaj at yahoo.com> wrote:
The N8VEM SBC homebrew computer I designed uses the
27C080 or 27C801 for its
boot device/block device/ROM drive.
I'd like to keep the costs as low as possible and am trying to keep the
EPROM at or below $5 each.
Digi-Key lists the M27C801-100F1 @ $7.12 each for q >= 10.
IC EPROM 8MBIT UV 100NS 32-FDIP
That's not too far away from $5 ...
8:21 a.m.
On Sat, Jun 7, 2008 at 11:33 PM, Eric Smith <eric at brouhaha.com> wrote:
Glen wrote:
Were you referring to the M27C801-100F1 part in particular as an OTP part?
Digi-Key lists the M27C801-100F1 @ $7.12 each for
q >= 10.
IC EPROM 8MBIT UV 100NS 32-FDIP
That's not too far away from $5 ...
Though it's an OTP, so as soon as you need to reprogram it once, you've
lost the cost savings.
From the datasheet that would appear to be a UV
erasable ceramic
window part, while the 'B' and "K" parts are the
OTP ones:
http://www.st.com/stonline/products/literature/ds/4377/m27c801.pdf
"The FDIP32W (window ceramic frit-seal package) has transparent lid
which allows the user
to expose the chip to ultraviolet light to erase the bit pattern."
"For applications where the content is programmed only one time and
erasure is not
required, the M27C801 is offered in PDIP32 and PLCC32 packages."
"Package
F = FDIP32W
B = PDIP32
K = PLCC32"
3:12 p.m.
Andrew Lynch wrote:
Looking for 1Mx8 EPROMs (27C080 or 27C801)
Sat Jun 7 13:22:24 CDT 2008
* Previous message: Looking for 1Mx8 EPROMs (27C080 or 27C801)
Hi Eric, Thanks for the reply!
Yes, finding new 1Mx8 EPROMs is not difficult but that isn't what I am
asking about.
They only cost about $10 new and are an excellent value, IMO.
However, I am trying to find some low cost *used* EPROM parts to help out
some homebrew SBC builders.
The N8VEM SBC homebrew computer I designed uses the 27C080 or 27C801 for its
boot device/block device/ROM drive.
I'd like to keep the costs as low as possible and am trying to keep the
EPROM at or below $5 each.
OTPs are an option but they are less desireable than the reuseable parts
with UV windows.
As it turns out, most of the people requesting the PCB for building their
own homebrew computer are also requesting the EPROM.
It rather surprised me as I thought more people would have their own EPROM
programmers and erasers.
I have a limited quantity of the 1Mx8 EPROMs on hand but not very many.
At the rate they are going out with the PCBs, I will exhaust my stock
quickly -- long before I run out of PCBs.
In retrospect, that is probably bad planning on my part this is an amateur
project and I am not a professional businessman.
I found a few more 1Mx8 EPROMs on eBay but that doesn't really solve the
problem.
What I need is the 1Mx8 EPROM equivalent to this website:
http://epromman.com/
I have purchased bulk used EPROMs from "Mr. EPROMMAN" before and they are an
excellent value.
Unfortunately, he doesn't carry the 1Mx8 parts. :-/
Thanks in advance if anyone can help.
Jerome Fine replies:
I have a number of:
AM27512DC
827USGY
@ 1983 AMD
with 28 pins each.
What are they? It is obvious they are an EPROM.
Sincerely yours,
Jerome Fine
9 Jun
9 Jun
3:51 p.m.
Tony wrote:
The digits after the '27' are the capacity in
kilobits. 512kbits =
64kbytes, etc.
Only for small parts. That numbering system fell apart after the
512 Kbit level. There were some 27C1024 parts, but most vendors
switched to numbers like 27C010, and even that wasn't done consistently.
The biggest gotchas with older EPROMs are:
* Variations in programming voltage, e.g.:
2732 - 25V
2732A - 21V
2732B - 12.5V
However, some vendors didn't follow Intel's lead on the
programming voltages and part number suffixes.
* Pinout and voltages differences for same part number:
Intel 2716 is a 5V-only part.
TI TMS2716 requires three supplies, and the pinout is
significantly different than the Intel part.
TI TMS2516 is fully compatible with the Intel 2716.
Most other vendor's 2716 parts were Intel 2716 compatible,
unless they were designated TMS2716.
On the other hand:
TI TMS2532 is NOT compatible with Intel 2732.
7:22 p.m.
New subject: older EPROMs (was Re: Looking for 1Mx8 EPROMs (27C080 or 27C801))
On Mon, Jun 09, 2008 at 12:51:36PM -0700, Eric Smith wrote:
On the other hand:
TI TMS2532 is NOT compatible with Intel 2732.
*But* it _is_ pin-compatible with the MOS 2332 ROM, so is useful for
the ROM sockets on dynamic PETs (2001-16N, 2001-32N, 3016, 3032, 4016,
4032, 8032).
When I see TMS2532s float by, I make sure to save them. They are a lot
less common than 2732s.
Of course, you can use a pin-swapper to fit a 2732 into a PET, but if
you have 2532s lying around, they go right in (as do 2716s, if you have
a 2K utility to install).
-ethan
--
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10:47 p.m.
New subject: older EPROMs (was Re: Looking for 1Mx8 EPROMs (27C080 or 27C801))
TI
TMS2532 is NOT compatible with Intel 2732.
*But* it _is_ pin-compatible with the MOS 2332 ROM, so is useful for the ROM sockets on dynamic PETs (2001-16N, 2001-32N,
3016, 3032, 4016,
4032, 8032).
When I see TMS2532s float by, I make sure to save them. They are a lot
less common than 2732s.
Of course, you can use a pin-swapper to fit a 2732 into a PET, but if
On the other hand, some programmers can program 2732s but not 2532s. In
that case you might be better off using the former chip and making a
daughterboard to swap the pins round in the machine.
-tony
5852
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10 comments
7 participants
participants (7)
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ard＠p850ug1.demon.co.uk -
ats＠offog.org -
eric＠brouhaha.com -
ethan.dicks＠usap.gov -
glen.slick＠gmail.com -
jhfinedp3k＠compsys.to -
lynchaj＠yahoo.com