24 Mar
2017
24 Mar
'17
9:44 a.m.
So all the DEUNA's I've seen have L10 (ceramic package, 10Mhz) 68K's in them.
Has anyone tried using anything else, and did it work?
I _assume_ an x12 would work, but until someone has acutally tried it...
The Pxx's (plastic packaging) might not work - according to the datasheet,
they are 2mm wider than the ceramics (why, I have no idea - it probably means
they aren't interchangeable, which makes no sense at all to me).
Noel
24 Mar
24 Mar
10:12 a.m.
On 03/24/2017 12:44 PM, Noel Chiappa via cctalk wrote:
So all the DEUNA's I've seen have L10 (ceramic
package, 10Mhz) 68K's in them.
Has anyone tried using anything else, and did it work?
I _assume_ an x12 would work, but until someone has acutally tried it...
The Pxx's (plastic packaging) might not work - according to the datasheet,
they are 2mm wider than the ceramics (why, I have no idea - it probably means
they aren't interchangeable, which makes no sense at all to me).
Noel
The 68K dips regardless of package use the same pin pads (center to
center location).
The issue was at the start the only 68K fast enough was only in ceramic
then.
You should be able to use any 68K that will clock at that speed ( I
forget what
the DEUNA ran at).
I have the big Moto microprocessor data book and that confirms all the DIP
parts are mechanically interchangeable. The ceramic is smaller but the
lead
shape (bend) defines the landing point and the socket pin location.
Allison
10:19 a.m.
On Fri, Mar 24, 2017 at 12:44:37PM -0400, Noel Chiappa via cctalk wrote:
So all the DEUNA's I've seen have L10 (ceramic
package, 10Mhz) 68K's in them.
Has anyone tried using anything else, and did it work?
I _assume_ an x12 would work, but until someone has acutally tried it...
I don't know, but isn't the DEUNA T11-based? So I think this is DELUA?
I'm getting old ... could have it wrong.
Anyway I'd be inclined to just try it. How is a slightly-wrong CPU likely
to do more damage than the definitely-fried CPU (right?) that's in there now?
John Wilson
D Bit
10:40 a.m.
On 03/24/2017 01:19 PM, John Wilson via cctalk wrote:
On Fri, Mar 24, 2017 at 12:44:37PM -0400, Noel Chiappa
via cctalk wrote:
DEQNA and DELQA (Qbus Ethernet
adaptor) DELUA is Ubus and older.
So all the DEUNA's I've seen have L10
(ceramic package, 10Mhz) 68K's in them.
Has anyone tried using anything else, and did it work?
I _assume_ an x12 would work, but until someone has acutally tried it...
I
don't know, but isn't the DEUNA T11-based? So I think this is DELUA?
I'm getting old ... could have it wrong. Anyway I'd be inclined to just try it. How is a
slightly-wrong CPU likely
to do more damage than the definitely-fried CPU (right?) that's in there now?
I'd be surprised the CPU is fried. Stolen for other uses maybe.
The 68K came in two major forms one was 16 bit bus the other was 8bit bus.
That swap would be likely to hurt the cpu. The other variants are package,
mask revision levels ( due to bugs in the microcode) and Clock maximum.
Allison
John Wilson
D Bit
4:09 p.m.
On 03/24/2017 04:02 PM, Paul Koning via cctalk wrote:
Ah yes. Its still logical 68K and the 8bit bus form.
Allison
On Mar 24,
2017, at 1:40 PM, allison via cctalk <cctalk at classiccmp.org> wrote:
...
The 68K came in two major forms one was 16 bit bus the other was 8bit bus.
Isn't that the 68008? paul
11:06 a.m.
On Mar 24, 2017, at 12:44 PM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
So all the DEUNA's I've seen have L10 (ceramic package, 10Mhz) 68K's in
them.
Has anyone tried using anything else, and did it work?
I _assume_ an x12 would work, but until someone has acutally tried it...
The Pxx's (plastic packaging) might not work - according to the datasheet,
they are 2mm wider than the ceramics (why, I have no idea - it probably means
they aren't interchangeable, which makes no sense at all to me).
I looked at the 68000 User Manual on the NXP website, which has package dimensions in
chapter 11: http://www.nxp.com/assets/documents/data/en/reference-manuals/MC68000UM.pdf
It shows two 48-pin packages (ceramic and plastic). The package bodies are not the same
width, but that is irrelevant. The dimension that matters is the pin spacing (dimension
"L" in those drawings) which is 0.600 inches in both cases. Similarly, the 64
pin packages have different body width but the same lead spacing (0.900 inches).
The reason the body widths differ is that in the plastic package, the pins come out
horizontally and are then bent down outside the body, so the bend radius adds to the pin
spacing. In the ceramic package, the pins are brazed to the sides of the body, so those
extra radii are absent.
So my conclusion is that the plastic parts will fit. Which makes sense; DIP packages
(independent of material) are designed to a small set of standard dimensions. 0.1 inch
lead pitch, pin spacing 0.300 or 0.400 or 0.600 or similar round numbers.
paul
12:56 p.m.
On 2017-Mar-24, at 11:06 AM, Paul Koning via cctalk wrote:
Which makes sense; DIP packages (independent of
material) are designed to a small set of standard dimensions. 0.1 inch lead pitch, pin
spacing 0.300 or 0.400 or 0.600 or similar round numbers.
One (perhaps the singular) exception to this is the DCJ11 (pdp11 microproc), a 60-pin DIP
with an over-wide body, ~ 1&9/32 in / 33mm, but then it's an unusual hybrid /
dual-chip ceramic package.
2604
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2604
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ajp166＠verizon.net -
bhilpert＠shaw.ca -
jnc＠mercury.lcs.mit.edu -
paulkoning＠comcast.net -
wilson＠dbit.com