I've taken and uploaded some larger easy to view images of the processor board
component and solder sides.
One plus is the eproms are socketed.
I've uploaded an image showing the silk screening stamp on the underside of the
eproms.
Now that I look closer at the Power Supply PWB I see it too
The only new information I can gather from those picture is it would
appear that pins 1 and 28 of the EPROMs is tied together and since 28
is Vcc, connected to +5V this would eliminate 27512 as pin 1 on a 27512
is A15, but on 2764, 27128, and 27256 it is Vpp and would normally be
tied to +5V f
I came across a reference to a cctalk message from 9 September 2006 and
would like to read the rest of the thread with the subject "PDP-8m Console
Switch Problems - fixed!".
Unfortunately it appears that the cctalk archive does not go back to 2006.
Is there some place with the complete cctalk arc
On 3/22/2022 9:23 AM, Tom Hunter via cctalk wrote:
I came across a reference to a cctalk message from 9 September 2006 and
would like to read the rest of the thread with the subject "PDP-8m Console
Switch Problems - fixed!".
Sending you the requested month. many titled messaages.
will send
There are a few other problems.
The power supply does not power up. Three of it's four voltages are missing
(+5vdc, +8.5vdc, +13vdc). With no connections to the power supply board,
the +5vdc measures 4.92vdc while the other two voltages are still zero
volts.
The second issue I found upon remo
You are correct ordinary glass does not transmit UV well, the UV lamps
normally used to erase EPROMs and germicidal lamps like the window in an
EPROM are made from quartz glass. Florescent lights do leak a little UV
but it would take a long time to erase an EPROM.
Paul.
On 2022-03-22 06:40, D
It is true that the glass blocks most of the UVC from florescent lamps. The key
word here is "most". It is not a 100% block.
When looking at aged data in EPROMs one should error on the side of caution.
As an example, I have a pole lamp that I use a standard florescent bulb, with
the typical spira
On Monday (03/21/2022 at 09:17PM -0700), Glen Slick via cctalk wrote:
> On Mon, Mar 21, 2022 at 8:25 PM Chuck Guzis via cctalk
> wrote:
> >
> > The PROMs are most likely house-labeled Intel commodity parts with
> > JEDEC-standard pinouts, so it should be fairly easy, using an EPROM
> > reader, to
Those look like "stripline" RF/microwave packages. PCBs will have cutouts
for the package body, so that the leads can be soldered flat (no bends)
directly onto impedance-controlled leads on the board.
On Tue, Mar 22, 2022 at 6:17 PM Oldcompu via cctech
wrote:
> Anybody know what these are? Mayb
> On Mar 22, 2022, at 1:25 PM, Magnus Ringman via cctech
> wrote:
>
> Those look like "stripline" RF/microwave packages. PCBs will have cutouts
> for the package body, so that the leads can be soldered flat (no bends)
> directly onto impedance-controlled leads on the board.
>
> On Tue, Mar
On Tue, Mar 22, 2022 at 11:56 AM Chris Elmquist wrote:
>
> Trying not to hijack the thread too much but I have an Intel D27C256-200
> here in my TL866II+ programmer and it returns ID 89h / 8Dh.
>
http://www.bitsavers.org/components/intel/_dataBooks/1993_Intel_Memory_Products.pdf
Page 5-78 (Page
On Tuesday (03/22/2022 at 12:20PM -0700), Glen Slick wrote:
> On Tue, Mar 22, 2022 at 11:56 AM Chris Elmquist wrote:
> >
> > Trying not to hijack the thread too much but I have an Intel D27C256-200
> > here in my TL866II+ programmer and it returns ID 89h / 8Dh.
> >
>
> http://www.bitsavers.org/c
In general: http://bitsavers.org/mailing_lists/cctalk_mailing_list/
However I just used Google Search on "PDP-8m Console Switch Problems - fixed!
CCTALK CCTECH" and the fourth hit was:
http://bitsavers.org/mailing_lists/cctalk_mailing_list/2006-September.txt
Then search in that page for "PDP
In case anyone else has been looking some of these, there is a listing for
multiple tubes-of-11 on eBay at a moderate price:
https://www.ebay.com/itm/123710245814
QTY-11 PCS. AMI SEMICONDUCTOR DC319 C04090 Integrated Circuit - (UIC
40378901)
It's documented in the DEC Semiconductor
I can tell you what some of the chips are on the power supply board, but
the list I have is mostly TTL parts
1582684 LM324
1582606 74LS74 F/F D-TYPE DUAL +E/T
2392122 7417 BUF/DVR HEX O/C (TPD0 30NS)
8272147 74LS05 INV HEX O/C
Aside from the house numbering of parts which is no
On Tue, Mar 22, 2022 at 12:25 PM Chris Elmquist wrote:
>
> On Tuesday (03/22/2022 at 12:20PM -0700), Glen Slick wrote:
> > On Tue, Mar 22, 2022 at 11:56 AM Chris Elmquist wrote:
> > >
> > > Trying not to hijack the thread too much but I have an Intel D27C256-200
> > > here in my TL866II+ programm
sorry to put on list, but never heard from Tom about what I sent him.
thanks
Jim
On 3/22/2022 9:23 AM, Tom Hunter via cctalk wrote:
I came across a reference to a cctalk message from 9 September 200
Thank you Jim and Pbirkel for your help.
Sorry for the slow reply. I live on the west coast of Australia in Perth
(GMT+8) so our time zones differ a lot.
Best regards
Tom Hunter
On Wed, Mar 23, 2022 at 11:25 AM jim stephens via cctalk <
cctalk@classiccmp.org> wrote:
> sorry to put on list, but
Years ago when I was at Intel, they would take EPROMs that had only a few
defects and attempt to program them with specific applications. They would then
usually paint the window black and put on that particular product number. When
we needed EPROMs in the lab, we would take a pile of these that
On 3/22/22 21:32, dwight via cctalk wrote:
> Years ago when I was at Intel, they would take EPROMs that had only a few
> defects and attempt to program them with specific applications. They would
> then usually paint the window black and put on that particular product
> number. When we needed EP
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