RE: Connecting LK250 to VAXmate
Hello Jason, I have all the bits necessary to make a cable for the LK250 now, without butchering the IBM Model M cable I bought (which turns out to only have 4 out of 6 wires). All I need now is the pinout. I have the VAXmate technical description which gives me pin numbers and signals for the cable, but I am not really sure how that maps to the connector pins. So, if you, or anyone else, could tell me the pinout for the LK250 cable I would be very grateful. From the technical description it looks like I may be able to get away with only 4 wires, not sure. Thanks Rob From: Jason T Sent: 15 June 2019 14:46 To: General Discussion: On-Topic and Off-Topic Posts ; robert.jarr...@ntlworld.com; r...@jarratt.me.uk Subject: Re: Connecting LK250 to VAXmate On Sat, Jun 15, 2019, 03:28 Rob Jarratt via cctalk mailto:cctalk@classiccmp.org> > wrote: I recently acquired a VAXmate with an LK250 keyboard. The problem is the keyboard came without the cable. It uses an 8-pin SDL connector and the usual tiny MMJ-like connector at the keyboard end. I don't know the pinout and I don't have the necessary crimping tools, is there any source for such a cable? Is it actually MMJ, with the offset pin, like a DEC serial cable? Or is it just an RJ connector like a telephone handset? And is the SDL end the same type as on an IBM model M keyboard? I have a VAXmate buried in storage. With enough prodding I could dig it out and try to determine the pinout of the cable.
Re: Connecting LK250 to VAXmate
> On Jun 15, 2019, at 9:45 AM, Jason T via cctalk wrote: > > On Sat, Jun 15, 2019, 03:28 Rob Jarratt via cctalk > wrote: > >> I recently acquired a VAXmate with an LK250 keyboard. The problem is the >> keyboard came without the cable. It uses an 8-pin SDL connector and the >> usual tiny MMJ-like connector at the keyboard end. I don't know the pinout >> and I don't have the necessary crimping tools, is there any source for such >> a cable? >> > > Is it actually MMJ, with the offset pin, like a DEC serial cable? Or is it > just an RJ connector like a telephone handset? And is the SDL end the same > type as on an IBM model M keyboard? > > I have a VAXmate buried in storage. With enough prodding I could dig it out > and try to determine the pinout of the cable. LK201 keyboards use a telephone handset type connector. You might try a handset cord, though it's possible those don't work because of not having enough copper in them. At least I remember being told that handset cords have "tinsel wire" in them, while LK201 cords use real wire. paul
RE: Connecting LK250 to VAXmate
Sorry, yes, I meant RJ like for a telephone. I believe the SDL end may be like an IBM but I don’t know, it is one of these: https://en.wikipedia.org/wiki/Shielded_data_link_connector Regards Rob From: Jason T Sent: 15 June 2019 14:46 To: General Discussion: On-Topic and Off-Topic Posts ; robert.jarr...@ntlworld.com; r...@jarratt.me.uk Subject: Re: Connecting LK250 to VAXmate On Sat, Jun 15, 2019, 03:28 Rob Jarratt via cctalk mailto:cctalk@classiccmp.org> > wrote: I recently acquired a VAXmate with an LK250 keyboard. The problem is the keyboard came without the cable. It uses an 8-pin SDL connector and the usual tiny MMJ-like connector at the keyboard end. I don't know the pinout and I don't have the necessary crimping tools, is there any source for such a cable? Is it actually MMJ, with the offset pin, like a DEC serial cable? Or is it just an RJ connector like a telephone handset? And is the SDL end the same type as on an IBM model M keyboard? I have a VAXmate buried in storage. With enough prodding I could dig it out and try to determine the pinout of the cable.
Re: Connecting LK250 to VAXmate
On Sat, Jun 15, 2019, 03:28 Rob Jarratt via cctalk wrote: > I recently acquired a VAXmate with an LK250 keyboard. The problem is the > keyboard came without the cable. It uses an 8-pin SDL connector and the > usual tiny MMJ-like connector at the keyboard end. I don't know the pinout > and I don't have the necessary crimping tools, is there any source for such > a cable? > Is it actually MMJ, with the offset pin, like a DEC serial cable? Or is it just an RJ connector like a telephone handset? And is the SDL end the same type as on an IBM model M keyboard? I have a VAXmate buried in storage. With enough prodding I could dig it out and try to determine the pinout of the cable. >
Connecting LK250 to VAXmate
I recently acquired a VAXmate with an LK250 keyboard. The problem is the keyboard came without the cable. It uses an 8-pin SDL connector and the usual tiny MMJ-like connector at the keyboard end. I don't know the pinout and I don't have the necessary crimping tools, is there any source for such a cable? Thanks Rob
