IIRC, John Mac was the designer for the DHQ/DHV. If my memory is correct, after DH was done, John had the idea of a mix and match synchronous/Async mux and came up with those designs. I dont remember who was on his team. COMMS 11 group had led (farmed out) the designs of the Sync version of a UART called USynRT in some parlance SIg 2652 and SMC 5027 IIFC. I ran the Signetics contract tech side. A fresh MIT PhD was the Sig POC, and there are more stories about that. I cant recall his name at this juncture. bob
On Sun, Jan 30, 2022 at 1:00 PM <cctalk-requ...@classiccmp.org> wrote: > > Send cctalk mailing list submissions to > cctalk@classiccmp.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.classiccmp.org/mailman/listinfo/cctalk > or, via email, send a message with subject or body 'help' to > cctalk-requ...@classiccmp.org > > You can reach the person managing the list at > cctalk-ow...@classiccmp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of cctalk digest..." > > > Today's Topics: > > 1. Re: What was a Terminal Concentration Device in DEC's > products? (Noel Chiappa) > 2. Re: What was a Terminal Concentration Device in DEC's > products? (Paul Koning) > 3. Re: What was a Terminal Concentration Device in DEC's > products? (Chris Zach) > 4. Re: What was a Terminal Concentration Device in DEC's > products? (Glen Slick) > 5. Re: What was a Terminal Concentration Device in DEC's > products? (Noel Chiappa) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 29 Jan 2022 15:58:53 -0500 (EST) > From: j...@mercury.lcs.mit.edu (Noel Chiappa) > To: cctalk@classiccmp.org > Cc: j...@mercury.lcs.mit.edu > Subject: Re: What was a Terminal Concentration Device in DEC's > products? > Message-ID: <20220129205853.15eea18c...@mercury.lcs.mit.edu> > > > From: Paul Koning > > > DH-11 is unusual in that it has DMA in both directions > > McNamara's DH11? (I don't know of another DECdevice of that name.) Per: > > > http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf > > it's DMA on output only; the input side has a FIFO that has to be emptied by > the CPU. > > Noel > > PS: I am familiar with the term 'terminal concentrator' from the networking > world, but as a generic term, not the name of a particular product. (Although > Cisco's first boxes may have included a terminal concentrator, so named.) > > Noel > > > > ------------------------------ > > Message: 2 > Date: Sat, 29 Jan 2022 17:12:41 -0500 > From: Paul Koning <paulkon...@comcast.net> > To: Noel Chiappa <j...@mercury.lcs.mit.edu>, "cctalk@classiccmp.org" > <cctalk@classiccmp.org> > Subject: Re: What was a Terminal Concentration Device in DEC's > products? > Message-ID: <684f1fcf-a6e6-4f3c-ac39-ada1504fc...@comcast.net> > Content-Type: text/plain; charset=us-ascii > > > > > On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk > > <cctalk@classiccmp.org> wrote: > > > >> From: Paul Koning > > > >> DH-11 is unusual in that it has DMA in both directions > > > > McNamara's DH11? (I don't know of another DECdevice of that name.) Per: > > > > > > http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf > > > > it's DMA on output only; the input side has a FIFO that has to be emptied > > by the CPU. > > Oh. That's amazing, all these years I thought it had DMA both ways. Clearly > not. I wonder how I got that misunderstanding. > > paul > > > > ------------------------------ > > Message: 3 > Date: Sat, 29 Jan 2022 18:49:06 -0500 > From: Chris Zach <c...@alembic.crystel.com> > To: Paul Koning <paulkon...@comcast.net>, "General Discussion: > On-Topic and Off-Topic Posts" <cctalk@classiccmp.org>, Paul Koning via > cctalk <cctalk@classiccmp.org>, Noel Chiappa > <j...@mercury.lcs.mit.edu>, "cctalk@classiccmp.org" > <cctalk@classiccmp.org> > Subject: Re: What was a Terminal Concentration Device in DEC's > products? > Message-ID: <24f062e4-8b26-4eb3-a573-b47c69a53...@alembic.crystel.com> > Content-Type: text/plain; charset=utf-8 > > Maybe that is the dhv11. Or the dv11 I'll look it up tomorrow > > On January 29, 2022 5:12:41 PM EST, Paul Koning via cctalk > <cctalk@classiccmp.org> wrote: > > > > > >> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk > >> <cctalk@classiccmp.org> wrote: > >> > >>> From: Paul Koning > >> > >>> DH-11 is unusual in that it has DMA in both directions > >> > >> McNamara's DH11? (I don't know of another DECdevice of that name.) Per: > >> > >> > >> http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf > >> > >> it's DMA on output only; the input side has a FIFO that has to be emptied > >> by the CPU. > > > >Oh. That's amazing, all these years I thought it had DMA both ways. > >Clearly not. I wonder how I got that misunderstanding. > > > > paul > > > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > > ------------------------------ > > Message: 4 > Date: Sat, 29 Jan 2022 16:47:27 -0800 > From: Glen Slick <glen.sl...@gmail.com> > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk@classiccmp.org> > Subject: Re: What was a Terminal Concentration Device in DEC's > products? > Message-ID: > <cam2uowl2hi2crm7ovphgd+uzfpepv+vuzoduan7a2a5xo+e...@mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > http://www.bitsavers.org/pdf/dec/qbus/EK-DHQ11-UG-002.pdf > DHQ11 User Guide, EK-DHQ11-UG.002 > > The main application of the M3107 DHQ11 is for interactive terminal > handling; it can also be used for data concentration and real-time > processing. It has two programming modes, DHV11 and DHU11. The > register sets in these modes are compatible with those of the DHV11 > and DHU11 respectively. The preferred mode of operation is DHU11 mode. > The main features of the DHQ11 are: > > ? For transmission: DMA transfers; or for each line, program transfers > to a 1 character transmit buffer in DHV11 mode, or to a 64-character > transmit FIFO in DHU11 mode > > ? For receive: a 256-entry FIFO buffer for received characters, > dataset status changes, and diagnostic information > > The M3118 CXA16 and the M3119 CXA08 have the same programming > interface as the M3107 DHQ11 > > > The M3108 DSV11 can do DMA transfers in both directions, although it > is a synchronous interface, not asynchronous. > > http://www.bitsavers.org/pdf/dec/qbus/EK-DSV11-TM-001_Jan87.pdf > DSV11 Technical Manual, EK-DSV11-TM-001 > > Functional Description (Section 1.5). The DSV11 supports a range of > synchronous protocols on the serial interface, and transfers data to > and from the host by DMA transfer. This section describes the way in > which the DSV11 handles data. > > On Sat, Jan 29, 2022 at 3:49 PM Chris Zach via cctalk > <cctalk@classiccmp.org> wrote: > > > > Maybe that is the dhv11. Or the dv11 I'll look it up tomorrow > > > > On January 29, 2022 5:12:41 PM EST, Paul Koning via cctalk > > <cctalk@classiccmp.org> wrote: > > > > > > > > >> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk > > >> <cctalk@classiccmp.org> wrote: > > >> > > >>> From: Paul Koning > > >> > > >>> DH-11 is unusual in that it has DMA in both directions > > >> > > >> McNamara's DH11? (I don't know of another DECdevice of that name.) Per: > > >> > > >> > > >> http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf > > >> > > >> it's DMA on output only; the input side has a FIFO that has to be > > >> emptied by the CPU. > > > > > >Oh. That's amazing, all these years I thought it had DMA both ways. > > >Clearly not. I wonder how I got that misunderstanding. > > > > > > paul > > > ------------------------------ > > Message: 5 > Date: Sun, 30 Jan 2022 09:26:46 -0500 (EST) > From: j...@mercury.lcs.mit.edu (Noel Chiappa) > To: cctalk@classiccmp.org > Cc: j...@mercury.lcs.mit.edu > Subject: Re: What was a Terminal Concentration Device in DEC's > products? > Message-ID: <20220130142646.5614818c...@mercury.lcs.mit.edu> > > > From: Chris Zach > > > Maybe that is the dhv11. > > The DH11, DHV11 and DHU11 are all very similar, although not 100.00% program > compatible. > (The DHQ11 can be set to exactly emulate either the DHV11 or DHU11.) So, all > provide > DMA output, but not DMA input. > > Differences with the DH11 include two full word registers for DMA address, > hardware ^S/^Q support, built-in diagnostics, etc. The DHV11 and DHU11 differ > in hardware echo, output FIFO, a fix for the infamous DH11 input silo level > bug, etc. > > Noel > > > End of cctalk Digest, Vol 88, Issue 30 > **************************************
