DUP11 synchronous serial line interface - Revision history

Jnc: New cat scheme

2023-02-18T02:21:42Z

New cat scheme

Jnc: /* External links */ +manuals (note changing case in DEC titles ;-)

2022-09-05T16:15:59Z

‎External links: +manuals (note changing case in DEC titles ;-)

Jnc: New cat

2022-08-15T19:30:20Z

New cat

Jnc: DU11 with CRC

2021-08-04T00:38:02Z

DU11 with CRC

Jnc: typo, +see also

2020-10-08T19:34:28Z

typo, +see also

Jnc: proper cat

2020-06-08T19:38:17Z

proper cat

Jnc: /* Registers */ add Transmitter Data Buffer Register

2020-04-10T20:42:23Z

‎Registers: add Transmitter Data Buffer Register

Jnc: /* Registers */ add Transmitter Status Register

2020-04-08T01:41:38Z

‎Registers: add Transmitter Status Register

Jnc: Add rcv regs

2020-03-29T18:29:11Z

Add rcv regs

Jnc: Basic info

2020-03-21T14:36:35Z

Basic info

New page

[[Image:DUP11-M7867.jpg|300px|thumb|right|DUP11 M7867 board]]

The '''DUP11''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]. 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 could operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 9.6K bits/second.

Both [[byte]]-oriented (e.g. [[DDCMP]], [[BISYNC]]) and [[bit]]-oriented (e.g. [[SDLC]], [[HDLC]]) [[protocol]]s were supported; a variety of [[cyclic redundancy check|CRC]] algorithms, depending on the[protocol in use on the line, were supported for error detection. The [[character]] length was 8 [[bit]]s; the [[sync character]] was selectable under program control, as well as the modem control leads. 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 DUP11 could also be set to discard additional incoming sync characters.

It was intended to interface to Bell 200 series [[modem]]s (models 201, 208 and 209) and equivalents.

It was a [[DEC card form factor|hex]] card, the '''M7867'''; it plugged into an [[Small Peripheral Controller|SPC]] slot. A [[Berg connector|Berg header]] on the card connected to a short [[flat cable]] which led off to a connector.

==Registers==

{| border=1
! Register !! Abbreviation !! Address
|-
|Receiver Status Register || RxCSR || 16xxx0
|-
|Receiver Data Buffer Register (read only) || RxDBUF || 16xxx2
|-
|Parameter Status Register (write only) || PARCSR || 16xxx2
|-
|Transmitter Status Register || TxCSR || 16xxx4
|-
|Transmitter Data Buffer Register || TxDBUF || 16xxx6
|}



[[Category:UNIBUS Peripherals]]

← Older revision		Revision as of 02:21, 18 February 2023
Line 117:		Line 117:
	* [http://www.bitsavers.org/pdf/dec/unibus/EK-DUP11-MM-003_DUP11Maint.pdf DUP11 Bit Synchronous Interface Maintenance Manual] (EK-DUP11-MM-003)		* [http://www.bitsavers.org/pdf/dec/unibus/EK-DUP11-MM-003_DUP11Maint.pdf DUP11 Bit Synchronous Interface Maintenance Manual] (EK-DUP11-MM-003)

−	[[Category: UNIBUS ~~Serial Interfaces]]~~	+	[[Category: UNIBUS Synchronous Serial Interfaces]]
−	~~[[Category: DEC~~ Synchronous Serial Interfaces]]

@@ Line 110: / Line 110: @@
 * [[DP11-A synchronous serial line interface]]
 [[Category: UNIBUS Serial Interfaces]]
 [[Category: DEC Synchronous Serial Interfaces]]

← Older revision		Revision as of 19:30, 15 August 2022
Line 111:		Line 111:
	* [[DP11-A synchronous serial line interface]]		* [[DP11-A synchronous serial line interface]]

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

@@ Line 1: / Line 1: @@
 [[Image:DUP11-M7867.jpg|300px|thumb|right|DUP11 M7867 board]]
-The '''DUP11''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]. 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 could operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 9.6K bits/second.
+The '''DUP11''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]. It was basically a [[DU11 synchronous serial line interface|DU11]] with [[cyclic redundancy check|CRC]] computation in [[hardware]]. Like the earlier DU11, 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 could operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 9.6K bits/second.
-Both [[byte]]-oriented (e.g. [[DDCMP]], [[BISYNC]]) and [[bit]]-oriented (e.g. [[SDLC]], [[HDLC]]) [[protocol]]s were supported; a variety of [[cyclic redundancy check|CRC]] algorithms, depending on the protocol in use on the line, were supported for error detection. The [[character]] length was 8 [[bit]]s; the [[sync character]] was selectable under program control, as well as the modem control leads. 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 DUP11 could also be set to discard additional incoming sync characters.
+Both [[byte]]-oriented (e.g. [[DDCMP]], [[BISYNC]]) and [[bit]]-oriented (e.g. [[SDLC]], [[HDLC]]) [[protocol]]s were supported; for error detection, a variety of CRC algorithms, depending on the protocol in use on the line, were supported. The [[character]] length was 8 [[bit]]s; the [[sync character]] was selectable under program control, as well as the modem control leads. 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 DUP11 could also be set to discard additional incoming sync characters.
 It was intended to interface to Bell 200 series [[modem]]s (models 201, 208 and 209) and equivalents.

@@ Line 3: / Line 3: @@
 The '''DUP11''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]. 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 could operate in either [[half-duplex]] or [[full-duplex]], at [[baud rate]]s up to 9.6K bits/second.
-Both [[byte]]-oriented (e.g. [[DDCMP]], [[BISYNC]]) and [[bit]]-oriented (e.g. [[SDLC]], [[HDLC]]) [[protocol]]s were supported; a variety of [[cyclic redundancy check|CRC]] algorithms, depending on the[protocol in use on the line, were supported for error detection. The [[character]] length was 8 [[bit]]s; the [[sync character]] was selectable under program control, as well as the modem control leads. 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 DUP11 could also be set to discard additional incoming sync characters.
+Both [[byte]]-oriented (e.g. [[DDCMP]], [[BISYNC]]) and [[bit]]-oriented (e.g. [[SDLC]], [[HDLC]]) [[protocol]]s were supported; a variety of [[cyclic redundancy check|CRC]] algorithms, depending on the protocol in use on the line, were supported for error detection. The [[character]] length was 8 [[bit]]s; the [[sync character]] was selectable under program control, as well as the modem control leads. 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 DUP11 could also be set to discard additional incoming sync characters.
 It was intended to interface to Bell 200 series [[modem]]s (models 201, 208 and 209) and equivalents.
@@ Line 106: / Line 106: @@
 * TSOM - Transmit Start of Message
 * TDBUF - Transmitter Data Buffer
 [[Category:UNIBUS Serial Interfaces]]

← Older revision		Revision as of 19:38, 8 June 2020
Line 107:		Line 107:
	* TDBUF - Transmitter Data Buffer		* TDBUF - Transmitter Data Buffer

−	[[Category:UNIBUS ~~Peripherals~~]]	+	[[Category:UNIBUS Serial Interfaces]]

@@ Line 92: / Line 92: @@
 * SEND - Send; enables the transmitter logic
 * HDFD - Half-Duplex/Full-Duplex
 [[Category:UNIBUS Peripherals]]

@@ Line 74: / Line 74: @@
 * SEC ADDR/RSYNC - Secondary Station Address / Receiver Sync
 ===16xxx4: Transmitter Status Register (TxCSR)===
 {{16bit-header}}
-| CARRF || RXOF || RING || MRDY || CARR || CTS || RTS || Unused || XDN || XDIE || XSIE || Unused || MXMT || Unused || IDLS || TRDY
+| DLT || MTDO || MCLK || MMSB || MMSA || MID || TACT || DRST || TDN || TIE || Unused || SEND || HDFD || colspan=3 | Unused
 {{16bitoctal-bitout}}
-* CARRF - Carrier Flag; set when modem's Carrier lead goes from On to Off
+* DLT - Transmitter Data Late Error
-* RXOF - Receiver Overrun Flag; receiver buffer not read before end of next character
+* MTDO - Maintenance Transmit Data Out
-* RING - Ring Flag; indicates a Ring signal from the modem
+* MCLK - Maintenance Clock
-* MRDY - Modem Ready; current state of modem Data Set Ready lead
+* MMSB - Maintenance Mode Select B
-* CARR - Carrier; current state of modem Carrier lead
+* MMSA - Maintenance Mode Select A
-* CTS - Clear to Send; current state of mode CTS lead
+* MID - Maintenance Input Data
-* RTS - Request to Send; set when transmit buffer is loaded, or if Idle Sync is set
+* TACT - Transmitter Active
-* XDN - Transmit Done Flag; set when output character transmission has started
+* DRST - Device Reset
-* XDIE - Transmit Done Interrupt Enable; allows a transmit interrupt when Transmit Done Flag is set
+* TDN - Transmitter Done; set when the Transmitter Data Buffer id ready for the next character
-* XSIE - Transmit Status Interrupt Enable; allows a transmit interrupt when any flag bit is set
+* TIE - Transmitter Interrupt Enable; allows a transmit interrupt when Transmit Done is set
-* MXMT - Miscellaneous Transmit; control any non-standard modem status
+* SEND - Send; enables the transmitter logic
-* IDLS - Idle Sync; allows transmission from the sync buffer
+* HDFD - Half-Duplex/Full-Duplex
 [[Category:UNIBUS Peripherals]]

@@ Line 24: / Line 24: @@
 |Transmitter Data Buffer Register          || TxDBUF || 16xxx6
 |}
-<!-- The [[address]]es shown are for the first DP11-A in a system; additional ones are normally set to be at 774760, 774750, etc to 774400.
+===16xxx0: Receiver Status Register (RxCSR)===
-===774770: Receiver Control and Status Register (DPRCSR)===
+{{16bit-header}}
 {{16bit-header}}
-| colspan=3 | Unused || CPAR || RACT || colspan=3 | BPCH || RDN || RDIE || colspan=2 |  Unused || MRCV || MAINT || HLFD || STRS
+| ERR || OVR || Rsvd || RCRC || Rsvd || RABO || REOM || RSOM ||  colspan=8 | DDAT
 {{16bitoctal-bitout}}
-* CPAR - Character Parity; parity of last character in the receive buffer
+* ERR - Error
-* RACT - Receiver Active; set after two consecutive sync characters
+* OVR - Overrun
-* BPCH - Bits per Character, selects between 6-8, 10-12 bits per character
+* RCRC - Receiver CRC
-* RDN - Receive Done Flag; set  when the receive buffer contains an assembled character
+* RABO - Received Abort
-* RDIE - Receive Interrupt Enable; allows an input interrupt when Receive Done Flag is set
+* REOM - End of Received Message
-* MRCV - Miscellaneous Receive; monitor any non-standard modem status
+* RSOM - Start of Received Message
-* MAINT -Maintenance Mode; connect Transmitter output to Receiver input, CTS simulation
+* RDAT - Received Data Buffer
-* HLFD - Half Duplex; RTS on inhibits Receive logic
-* STRS - Strip Sync; sync characters following Receive Active are discarded
+===16xxx2: Parameter Status Register (PARCSR)===
-===774774: Transmitter Control and Status Register (DPXCSR)===
+<!--
 {{16bit-header}}