Tymshare Base-Host Protocol - Revision history

Larsbrinkhoff: Link to SUMEX-AIM.

2023-06-10T06:26:18Z

Link to SUMEX-AIM.

Jnc: /* External links */ Better cat

2022-06-09T13:40:01Z

‎External links: Better cat

Jnc: Add some more links; typos

2022-04-29T00:15:28Z

Add some more links; typos

Larsbrinkhoff: Larsbrinkhoff moved page Tymnet protocol to Tymshare Base-Host Protocol: Update name to reflect Tymeshare documentation.

2022-04-28T20:00:10Z

Larsbrinkhoff moved page Tymnet protocol to Tymshare Base-Host Protocol: Update name to reflect Tymeshare documentation.

Larsbrinkhoff: Two links.

2022-04-28T17:30:56Z

Two links.

Larsbrinkhoff: It seems "TymBAS" is the official spelling.

2022-04-28T17:20:35Z

It seems "TymBAS" is the official spelling.

Jnc: Add a bunch of links; also, too long to be a plain stub :-)

2022-04-28T12:29:50Z

Add a bunch of links; also, too long to be a plain stub :-)

Larsbrinkhoff: Type G length does not include the header.

2022-04-28T11:52:23Z

Type G length does not include the header.

Larsbrinkhoff: Padding.

2022-04-28T07:23:33Z

Padding.

Larsbrinkhoff: Brief description of the shared memory interface.

2022-04-28T07:20:53Z

Brief description of the shared memory interface.

@@ Line 315: / Line 315: @@
 |}
-This information comes from the SUMEX-AIM monitor file TYMSRV.MAC, written by Michael A. Heathman in 1975.  Additional updates from the [[SRI-NIC]] version from 1982.
+This information comes from the [[SUMEX-AIM]] monitor file TYMSRV.MAC, written by Michael A. Heathman in 1975.  Additional updates from the [[SRI-NIC]] version from 1982.
 {{semi-stub}}

@@ Line 316: / Line 316: @@
 This information comes from the SUMEX-AIM monitor file TYMSRV.MAC, written by Michael A. Heathman in 1975.  Additional updates from the [[SRI-NIC]] version from 1982.
 ==External links==
@@ Line 322: / Line 324: @@
 * [https://github.com/TYMCOM-X/169281.tape/blob/61a4c1fcd77c19952506cd141ca9bb9dd0adfd4c/fremontdoc/tbase.doc (FREMONTDOC)TBASE.DOC] - TYMCOM-X documenting the Tymeshare Base-Host Protocol.
-{{semi-stub}}
+[[Category: Network Protocols]]

@@ Line 1: / Line 1: @@
 [[Image:Tymnet-man1.jpg|thumb|right|Humorous visualization of Tymnet protocol]]
-This documents the [[protocol]], as used around 1975-1982, between a [[PDP-10]] [[host]] and Varian 620 TymBAS.  At a low level, the interface consists of shared memory; one page (512 words) at address 02000 (octal).  The memory has some [[meta-data]] and [[ring buffer]]s for input and output.  The host and the TymBAS regularly poll this memory for updates.
+This documents the [[protocol]], as used around 1975-1982, between a [[PDP-10]] [[host]] and Varian 620 TymBAS.  At a low level, the interface consists of [[shared memory]]; one page (512 words) at [[address]] 02000 (octal).  The memory has some [[meta-data]] and [[ring buffer]]s for input and output.  The host and the TymBAS regularly poll this memory for updates.
-Messages are transmitted from the PDP-10 as 36-bit words with four [[octet]]s in bits 0-31.  Bits 32-35 are unused.
+Messages are transmitted from the PDP-10 as 36-bit [[word]]s with four [[octet]]s in bits 0-31.  Bits 32-35 are unused.
 Message types A, B, C, and D are just 4 octets.
@@ Line 28: / Line 28: @@
 |}
-Type G messages have a variable number of octets.  The message number is 0200 (octal) plus the number of data octets following the 16-bit header.  The last word is padded out to a 36-bit boundary.
+Type G messages have a variable number of octets.  The message number is 0200 (octal) plus the number of data octets following the 16-bit [[header]].  The last word is padded out to a 36-bit boundary.
 {| class="wikitable"
@@ Line 247: / Line 247: @@
 | B
 | BOC
-| Block ouptut complete.
+| Block output complete.
 |-
 | 46
@@ Line 272: / Line 272: @@
 | B
 | IRQ
-| Requst block input termination.
+| Request block input termination.
 |-
 | 53
@@ Line 309: / Line 309: @@
 | Enter alt output device mode.
 |-
-| 200+''n''
+| 0200+''n''
 | G
+|

@@ Line 316: / Line 316: @@
 This information comes from the SUMEX-AIM monitor file TYMSRV.MAC, written by Michael A. Heathman in 1975.  Additional updates from the [[SRI-NIC]] version from 1982.
 {{semi-stub}}
 [[Category: Networking]]

@@ Line 1: / Line 1: @@
 [[Image:Tymnet-man1.jpg|thumb|right|Humorous visualization of Tymnet protocol]]
-This documents the [[protocol]], as used around 1975-1982, between a [[PDP-10]] [[host]] and Varian 620 Tymbase.  At a low level, the interface consists of shared memory; one page (512 words) at address 02000 (octal).  The memory has some [[meta-data]] and [[ring buffer]]s for input and output.  The host and the Tymbase regularly poll this memory for updates.
+This documents the [[protocol]], as used around 1975-1982, between a [[PDP-10]] [[host]] and Varian 620 TymBAS.  At a low level, the interface consists of shared memory; one page (512 words) at address 02000 (octal).  The memory has some [[meta-data]] and [[ring buffer]]s for input and output.  The host and the TymBAS regularly poll this memory for updates.
 Messages are transmitted from the PDP-10 as 36-bit words with four [[octet]]s in bits 0-31.  Bits 32-35 are unused.

← Older revision	Revision as of 20:00, 28 April 2022
(No difference)

@@ Line 30: / Line 30: @@
 |}
-Type G messages have a variable number of octets.  The message number is 200 (octal) plus the total number of octets in the message, including header.
+Type G messages have a variable number of octets.  The message number is 200 (octal) plus the number of data octets following the 16-bit header.  The last word is padded out to a 36-bit boundary.
 {| class="wikitable"

@@ Line 40: / Line 40: @@
 | colspan="4" | Data as per ''n''
 |-
-| colspan="4" | ...
+| colspan="3" | ...
 |}

@@ Line 3: / Line 3: @@
 [[Image:Tymnet-man1.jpg|thumb|right|Humorous visualization of Tymnet protocol]]
-This documents the protocol, as used around 1975-1982, between a PDP-10 host and Varian 620 Tymbase.
+This documents the protocol, as used around 1975-1982, between a PDP-10 host and Varian 620 Tymbase.  At a low level, the interface consists of shared memory; one page (512 words) at address 2000 (octal).  The memory has some metadata and ring buffers for input and output.  The host and the Tymbase regularly poll this memory for updates.
 Messages are transmitted from the PDP-10 as 36-bit words with four octets in bits 0-31.  Bits 32-35 are unused.