19 Sep
2026
19 Sep
'26
8:46 p.m.
Does anyone have one (or know where I can get one) of the 80 pin high
density cables that connects the 16500B main board to the 16500-68733
(16500L or 16500H) LAN/High Speed interface board.
The cable part # is 16500-61607or 16500-61608.
Please contact me off list at bitwiz(a)12bitsbest.com
Thank you,
Mike
19 Sep
19 Sep
9:20 p.m.
On Sat, Sep 19, 2026, 8:47 PM Mike Katz via cctalk <cctalk(a)classiccmp.org
wrote:
Does anyone have one (or know where I can get one) of
the 80 pin high
density cables that connects the 16500B main board to the 16500-68733
(16500L or 16500H) LAN/High Speed interface board.
The cable part # is 16500-61607or 16500-61608.
I wonder if the 80 conductor cables on the 16550A modules use the same
connectors, and if so, if those cables are long enough to connect between a
16500B CPU board and a 16500L or 16500H board.
I'll have to see if I can find the time to answer that question. If the
answers are yes, it might be easier to acquire an 80 conductor cable from a
16550A module than a 16500L / 16500H cable. I have some 16550A modules that
I don't have much real reason to ever use instead of 16555A or better
modules.
9:33 p.m.
The distance is about 4 inches or less I believe. I can measure it.
Thank you....
On 9/19/2026 11:20 PM, Glen Slick via cctalk wrote:
On Sat, Sep 19, 2026, 8:47 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org>
wrote:
Does anyone have one (or know where I can get
one) of the 80 pin high
density cables that connects the 16500B main board to the 16500-68733
(16500L or 16500H) LAN/High Speed interface board.
The cable part # is 16500-61607or 16500-61608.
I wonder if the 80 conductor cables on the 16550A modules use the same
connectors, and if so, if those cables are long enough to connect between a
16500B CPU board and a 16500L or 16500H board.
I'll have to see if I can find the time to answer that question. If the
answers are yes, it might be easier to acquire an 80 conductor cable from a
16550A module than a 16500L / 16500H cable. I have some 16550A modules that
I don't have much real reason to ever use instead of 16555A or better
modules.
10:44 p.m.
On Sat, Sep 19, 2026, 9:33 PM Mike Katz via cctalk <cctalk(a)classiccmp.org
wrote:
The distance is about 4 inches or less I believe. I
can measure it.
The 80 conductor 16550A cable might be too short. Also, it might be keyed
the wrong way even if it was long enough. The 16550A cable polarization tab
is keyed pin 1 to pin 1, while the 16500B / 16500L/H cable might be reverse
keyed between the two ends. I'd have to pull the lid off of a 16500B to
check.
9:49 p.m.
Glen,
Looking at my two 16550A boards and how they are connected together.
The cable that goes from J6 on the upper board to J5 on the lower board.
I'm glad I checked because that cable has come disconnected form J5 on
the lower board.
Thanks again,
Mike
On 9/19/2026 11:20 PM, Glen Slick via cctalk wrote:
On Sat, Sep 19, 2026, 8:47 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org>
wrote:
Does anyone have one (or know where I can get
one) of the 80 pin high
density cables that connects the 16500B main board to the 16500-68733
(16500L or 16500H) LAN/High Speed interface board.
The cable part # is 16500-61607or 16500-61608.
I wonder if the 80 conductor cables on the 16550A modules use the same
connectors, and if so, if those cables are long enough to connect between a
16500B CPU board and a 16500L or 16500H board.
I'll have to see if I can find the time to answer that question. If the
answers are yes, it might be easier to acquire an 80 conductor cable from a
16550A module than a 16500L / 16500H cable. I have some 16550A modules that
I don't have much real reason to ever use instead of 16555A or better
modules.
10:03 p.m.
Glen,
I'm hoping to purchase two 16557Ds to upgrade the two 16550As that I
have. How do the 16557D's connect to each other or do they not need to
connect together?
Thanks again,
Mike
On 9/19/2026 11:20 PM, Glen Slick via cctalk wrote:
On Sat, Sep 19, 2026, 8:47 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org>
wrote:
Does anyone have one (or know where I can get
one) of the 80 pin high
density cables that connects the 16500B main board to the 16500-68733
(16500L or 16500H) LAN/High Speed interface board.
The cable part # is 16500-61607or 16500-61608.
I wonder if the 80 conductor cables on the 16550A modules use the same
connectors, and if so, if those cables are long enough to connect between a
16500B CPU board and a 16500L or 16500H board.
I'll have to see if I can find the time to answer that question. If the
answers are yes, it might be easier to acquire an 80 conductor cable from a
16550A module than a 16500L / 16500H cable. I have some 16550A modules that
I don't have much real reason to ever use instead of 16555A or better
modules.
10:20 p.m.
On Sat, Sep 19, 2026, 10:03 PM Mike Katz via cctalk <cctalk(a)classiccmp.org
wrote:
Glen,
I'm hoping to purchase two 16557Ds to upgrade the two 16550As that I
have. How do the 16557D's connect to each other or do they not need to
connect together?
The 16554/5/6/7 modules have a 20 conductor cable plugged between two
connectors on a single module configuration. On a multiple module
configuration one end of the cable is unplugged from one of the connectors
on each of the expander boards and plugged into a different connector on
the master board.
Also, an additional pair of cables is needed to connect between a pair of
connectors on each board of a multiple board set.
HP part number 16555-68701 or 16555-68705 is a set of pairs of cables for
different numbers of boards in the set. 16555 are limited to 3 board sets,
16556/7 up to 5 board sets.
For example item 263655364718 or 355859408593 on eBay.
11:03 p.m.
Glenn,
If those cables are standard density (100mil pitch) I can make them here.
Thanks,
Mike
On 9/20/2026 12:20 AM, Glen Slick via cctalk wrote:
On Sat, Sep 19, 2026, 10:03 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org>
wrote:
Glen,
I'm hoping to purchase two 16557Ds to upgrade the two 16550As that I
have. How do the 16557D's connect to each other or do they not need to
connect together?
The 16554/5/6/7 modules have a 20 conductor cable plugged between two
connectors on a single module configuration. On a multiple module
configuration one end of the cable is unplugged from one of the connectors
on each of the expander boards and plugged into a different connector on
the master board.
Also, an additional pair of cables is needed to connect between a pair of
connectors on each board of a multiple board set.
HP part number 16555-68701 or 16555-68705 is a set of pairs of cables for
different numbers of boards in the set. 16555 are limited to 3 board sets,
16556/7 up to 5 board sets.
For example item 263655364718 or 355859408593 on eBay.
11:24 p.m.
Glen,
Thank you, I just ordered a set of the 1655X cables, the seller is about
3 miles from me. So no shipping involved. I also asked him about the
80 pin high density cable.
thank you for all of your help.
Now I need to get two 16577D boards, one 16534A board, one 16534A and
one 16522A. And then if I can get lucky a a 16505 to help me design a
debug board for my PDP-8/E computer from the 70's.
I also have a 16500C coming from ebay, I plan on putting all of the good
cards in that and then selling the 16500b with the LAN and Memory upgrade.
Thank you for all of your help,
Mike.
On 9/20/2026 12:20 AM, Glen Slick via cctalk wrote:
On Sat, Sep 19, 2026, 10:03 PM Mike Katz via cctalk
<cctalk(a)classiccmp.org>
wrote:
Glen,
I'm hoping to purchase two 16557Ds to upgrade the two 16550As that I
have. How do the 16557D's connect to each other or do they not need to
connect together?
The 16554/5/6/7 modules have a 20 conductor cable plugged between two
connectors on a single module configuration. On a multiple module
configuration one end of the cable is unplugged from one of the connectors
on each of the expander boards and plugged into a different connector on
the master board.
Also, an additional pair of cables is needed to connect between a pair of
connectors on each board of a multiple board set.
HP part number 16555-68701 or 16555-68705 is a set of pairs of cables for
different numbers of boards in the set. 16555 are limited to 3 board sets,
16556/7 up to 5 board sets.
For example item 263655364718 or 355859408593 on eBay.
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