DS11 Multiple Line Synchronous Interface - Revision history

Jnc: /* Interrupt vector */ typo

2024-01-05T16:38:59Z

‎Interrupt vector: typo

Jnc: /* Interrupt vector */ Add

2024-01-05T16:38:31Z

‎Interrupt vector: Add

Jnc: Add ISR, reg contents

2024-01-05T02:54:27Z

Add ISR, reg contents

Jnc: Add implementation details - board types

2023-11-19T19:02:05Z

Add implementation details - board types

Jnc: Gleaned a bit more from the manual

2023-11-19T01:36:16Z

Gleaned a bit more from the manual

Jnc: New cat scheme

2023-02-18T02:20:27Z

New cat scheme

Jnc: Stubby, but it's '''something'''

2022-09-23T19:31:33Z

Stubby, but it's '''something'''

New page

The '''DS11 Multiple Line Synchronous Interface''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it can handle up to 16 lines.

It consists of a master line scanner, and up to four adapters, each of which can handle up to four lines. Physically, it is a large [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]]; each line has a separate [[DEC card form factor|quad]] M7110 Line Control Module.

==Registers==

{| border=1
! Register !! Abbreviation !! Address
|-
|Receiver Status Register || RxCSR || 775xx0
|-
|Receiver Data Buffer Register || RxDBUF || 775xx2
|-
|Transmitter Status Register || TxCSR || 775xx4
|-
|Transmitter Data Buffer Register || TxDBUF || 775xx6
|}

Line addresses:

* Line 0: 775400-775406
: ...
* Line 15: 775570-775576


{{semi-stub}}

==See also==

* [[DU11 synchronous serial line interface]]

==Further reading==

* ''DS11 Multiple Line Synchronous Interface Maintenance Manual'' (DEC-00-DS11-DB; not available online, but in fiche)

==External links==

* [http://bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-XSRMA-A-D%20DECsystem10%20System%20Reference%20Manual.pdf DECsystem-10 System Reference Manual] - documents the DS11 registers in Appendix C (pp. 370-371 of the PDF)
* [https://archive.org/35/items/bitsavers_decmodules_110248/M7110_text.pdf M7110]

[[Category: UNIBUS Serial Interfaces]]
[[Category: DEC Synchronous Serial Interfaces]]

@@ Line 99: / Line 99: @@
 * DIAGBC - Diagnostic Bit Counter
-==Interrupt vector==
+==Interrupt vectors==
 The DS11 uses an [[array]] of [[interrupt vector]]s, as follows:

@@ Line 98: / Line 98: @@
 * CLRBC - Clear Bit Counter
 * DIAGBC - Diagnostic Bit Counter
 ==Implementation==

@@ Line 1: / Line 1: @@
 The '''DS11 Multiple Line Synchronous Interface''' was an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it could handle up to 16 lines. It used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it could operate in either [[half-duplex]] or [[full-duplex]] mode.
-It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface to Bell 200 series [[modem]]s (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303. Character lengths of 6, 8 and 12 bits were supported, and could be configured by software.
+Character lengths of 6, 8 and 12 bits were supported, and could be configured by software. It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface to Bell 200 series [[modem]]s (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303.
-It consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate [[DEC card form factor|quad]] M7110 Line Control Module. It used an [[M105 Address Selector]] to set its bus address. Physically, it is a large quad-height [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]].
+<!--
-<!--
+The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
-The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
+It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters.
 -->
 ==Registers==
@@ Line 101: / Line 100: @@
 {{16bitoctal-bitout}}
-* TDBUF - Transmitter Data Buffer -->
+* TDBUF - Transmitter Data Buffer
 {{semi-stub}}
@@ Line 117: / Line 164: @@
 * [http://bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-XSRMA-A-D%20DECsystem10%20System%20Reference%20Manual.pdf DECsystem-10 System Reference Manual] - documents the DS11 registers in Appendix C (pp. 370-371 of the PDF)
 * [http://www.bitsavers.org/pdf/dec/modules/mSeries/M7110.pdf M7110]
 [[Category: UNIBUS Synchronous Serial Interfaces]]

@@ Line 22: / Line 22: @@
 |-
 |Transmitter Data Buffer Register          || TxDBUF || 775xx6
 |}
@@ Line 29: / Line 31: @@
 : ...
 * Line 15: 775570-775576
-<!--
-===16xx10: Receiver Status Register (RxCSR)===
+In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in ''italics'', and write-only in '''bold'''.
 {{16bit-header}}
-| DSC || RING || CTS || CARR || RACT || SECRCV || DSR || STRSYN || RDN || RIE || DSIE || SRCHSYN || SECXMT || RTS || DTR || Unused
+| RING || BITOVR || CHAROVR || CARLST || colspan=2 | SYNCST || ''CARDET'' || DTR || ''DONE'' || ''DSR'' || colspan=2 | CHARLEN || colspan=2 | DNIA || RNGENB || RCVENB
 {{16bitoctal-bitout}}
-* DSC - Data Set Change; set for any change on Ring, Carrier, Data Set Ready, Clear to Send or Secondary Received Data lines
+* BITOVR - Bit Overrun
-* RING - Ring Indicator
+* CHAROVR - Character Overrun
-* CTS - Clear to Send
+* CARLST - Carrier Lost
-* CARR - Carrier
+* SYNCST - Sync State
-* RACT - Receiver Active; setting dependent on the internal/external synchronization mode
+* CARDET - Carrier Detected
-* SECRCV - Secondary Received Data
+* DTR - Data Terminal Ready
 * DSR - Data Set Ready
-* STRSYN - Strip Sync; sync characters are discarded
+* CHARLEN - Character Length
-* RDN - Receive Done Flag; set  when the receive buffer is filled with an assembled character
+* DNIA - Done Interrupt Assignment
-* RIE - Receiver Interrupt Enable; allows an input interrupt when Receive Done is set
+* RNGENB - Ring Enable
-* DSIE - Data Set Interrupt Enable; allows an input interrupt when DSC is set
+* RCVENB - Receiver Enable
-===16xx12 (read): Receiver Data Buffer Register (RxDBUF)===
+===175xx2 (read): Receiver Data Buffer Register (RxDBUF)===
 {{16bit-header}}
-| ERR || OVR || Unused || PARERR || colspan=4 | Unused ||  colspan=8 | RDBUF
+| colspan=4 | Unused || colspan=12 | RDBUF
 {{16bitoctal-bitout}}
 * RDBUF - Receiver Data Buffer
-===16xx12 (write): Parameter Control Register (PARCSR)===
+===175xx4: Transmitter Status Register (TxCSR)===
 {{16bit-header}}
-| colspan=2 | Unused || colspan=2 | MODE || colspan=2 | LEN || PAR EN || EVEN PAR ||  colspan=8 | SYNC
+| Unused || BITOVR || CHAROVR || CTSLST || colspan=2 | Unused || ''CTS'' || DTR || DONE || ''DSR'' || colspan=2 | CHARLEN || colspan=2 | DNIA || IDLE || RTS
 {{16bitoctal-bitout}}
-* MODE - Synchronous Mode Select (10=External, 11=Internal)
+* BITOVR - Bit Overrun
-* LEN - Length (00=5, 01=6, 10=7, 11=8)
+* CHAROVR - Character Overrun
-* PAR EN - Parity Enable
+* CTSLST - Clear to Send Lost
-* EVEN PAR - Even Parity selected
+* CTS - Clear to Send
-* SYNC - Sync Character
+* DTR - Data Terminal Ready
-===16xx14: Transmitter Status Register (TxCSR)===
+===175xx6: Transmitter Data Buffer Register (TxDBUF)===
 {{16bit-header}}
-| DNA || MD || MCLK || colspan=2 | MMS || MBW || Unused || MR || TDN || TIE || DNAIE || SEND || HDFD || colspan=2 | Unused || BRK
+| colspan=4 | Unused || colspan=12 | TDBUF
 {{16bitoctal-bitout}}
-* DNA - Data Not Available
+* TDBUF - Transmitter Data Buffer
-===16xx16: Transmitter Data Buffer Register (TxDBUF)===
+===175600: Interface Status Register (ISTR)===
 {{16bit-header}}
-| colspan=8 | Unused ||  colspan=8 | TDBUF
+| ''A3IN'' || ''A2IN'' || ''A1IN'' || colspan=3 | Unused || colspan=2 | VAHBITS || DIAGM || PRCLK || Unused || '''CLRBC''' || colspan=4 | ''DIAGBC''
 {{16bitoctal-bitout}}
-* TDBUF - Transmitter Data Buffer
+* A3IN - Adapter 3 In
 ==Implementation==

@@ Line 1: / Line 1: @@
-The '''DS11 Multiple Line Synchronous Interface''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it can handle up to 16 lines.
+The '''DS11 Multiple Line Synchronous Interface''' was an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it could handle up to 16 lines. It used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it could operate in either [[half-duplex]] or [[full-duplex]] mode.
-It consists of a master line scanner, and up to four adapters, each of which can handle up to four lines. Physically, it is a large [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]]; each line has a separate [[DEC card form factor|quad]] M7110 Line Control Module.
+It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface to Bell 200 series [[modem]]s (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303. Character lengths of 6, 8 and 12 bits were supported, and could be configured by software.
-Like the earlier [[DP11-A synchronous serial line interface|DP11-A]], it used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it was double-[[buffer]]ed for both input and output.
+It consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate [[DEC card form factor|quad]] M7110 Line Control Module. It used an [[M105 Address Selector]] to set its bus address. Physically, it is a large quad-height [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]].
 It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface (to Bell 200 series [[modem]]s, such as the model 201, and equivalents), and optionally a [[20mA current loop serial line interface|current loop]] interface (to Bell 300 series modems, such as the model 303, and equivalents). [[Baud rate]]s of up to 9.6K bits/second were supported by the EIA interface, and up to 100K bits/second by the current loop interface.
-The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. It could operate in either [[half-duplex]] or [[full-duplex]] mode. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
+The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
-<!-- It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters. The DU11 could also be set to discard additional incoming sync characters. --
+<!-- It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters.
 -->
 ==Registers==