Difference between revisions of "Tymshare Base-Host Protocol"
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(This version from 1975.) |
(It's called message, not packet. Add message type column.) |
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This documents the protocol, as used around 1975, between a PDP-10 host and Varian 620 Tymbase. | This documents the protocol, as used around 1975, between a PDP-10 host and Varian 620 Tymbase. | ||
| − | + | Messages start with a 4-octet header. More data may optionally follow after the header, depending on the message type. | |
{| class="wikitable" | {| class="wikitable" | ||
| − | | | + | | Message number |
| Port | | Port | ||
| Subtype | | Subtype | ||
| Line 14: | Line 14: | ||
|} | |} | ||
| − | + | Messages. Any number not in this list is illegal. | |
{| class="wikitable" | {| class="wikitable" | ||
| Number | | Number | ||
| + | | Type | ||
| Name | | Name | ||
| Comment | | Comment | ||
|- | |- | ||
| 1 | | 1 | ||
| + | | A | ||
| ANS | | ANS | ||
| System is answering. | | System is answering. | ||
|- | |- | ||
| 2 | | 2 | ||
| + | | A | ||
| SHT | | SHT | ||
| System is up but shut. | | System is up but shut. | ||
|- | |- | ||
| 3 | | 3 | ||
| + | | A | ||
| CRS | | CRS | ||
| Sender is crashed. | | Sender is crashed. | ||
|- | |- | ||
| 4 | | 4 | ||
| + | | A | ||
| DIE | | DIE | ||
| Recipient should crash. | | Recipient should crash. | ||
|- | |- | ||
| 5 | | 5 | ||
| + | | A | ||
| NSP | | NSP | ||
| Base taken over by new supervisor. | | Base taken over by new supervisor. | ||
|- | |- | ||
| 6 | | 6 | ||
| + | | B | ||
| LOG | | LOG | ||
| Login, next 4 data characters are the info about terminal type, and port or origin, then name, etc. | | Login, next 4 data characters are the info about terminal type, and port or origin, then name, etc. | ||
|- | |- | ||
| 7 | | 7 | ||
| + | | B | ||
| AUX | | AUX | ||
| − | | Supervisor response to establishing | + | | Supervisor response to establishing auxiliary circuit. |
|- | |- | ||
| 10 | | 10 | ||
| + | | B | ||
| NOP | | NOP | ||
| − | | | + | | Back pressure on. |
|- | |- | ||
| 11 | | 11 | ||
| + | | B | ||
| OUP | | OUP | ||
| − | | | + | | Back pressure off. |
|- | |- | ||
| 12 | | 12 | ||
| + | | B | ||
| GOB | | GOB | ||
| Character gobbler. | | Character gobbler. | ||
|- | |- | ||
| 13 | | 13 | ||
| + | | B | ||
| ZAP | | ZAP | ||
| Circuit zapper. | | Circuit zapper. | ||
|- | |- | ||
| 14 | | 14 | ||
| + | | B | ||
| EDC | | EDC | ||
| Enter deferred echo mode. | | Enter deferred echo mode. | ||
|- | |- | ||
| 15 | | 15 | ||
| + | | B | ||
| LDC | | LDC | ||
| Leave deferred echo mode. | | Leave deferred echo mode. | ||
|- | |- | ||
| 16 | | 16 | ||
| + | | B | ||
| GRN | | GRN | ||
| Green ball. | | Green ball. | ||
|- | |- | ||
| 17 | | 17 | ||
| + | | B | ||
| RED | | RED | ||
| Red ball. | | Red ball. | ||
|- | |- | ||
| 20 | | 20 | ||
| + | | B | ||
| YEL | | YEL | ||
| Yellow ball. | | Yellow ball. | ||
|- | |- | ||
| 21 | | 21 | ||
| + | | B | ||
| ORG | | ORG | ||
| Orange ball. | | Orange ball. | ||
|- | |- | ||
| 22 | | 22 | ||
| + | | B | ||
| HNG | | HNG | ||
| Hang character - not used. | | Hang character - not used. | ||
|- | |- | ||
| 23 | | 23 | ||
| + | | B | ||
| ETM | | ETM | ||
| Enter 2741 transparent mode. | | Enter 2741 transparent mode. | ||
|- | |- | ||
| 24 | | 24 | ||
| + | | B | ||
| LTM | | LTM | ||
| Leave 2741 transparent mode. | | Leave 2741 transparent mode. | ||
|- | |- | ||
| 25 | | 25 | ||
| + | | C | ||
| LOS | | LOS | ||
| Lost ball, data has been lost from buffers. The data filed may tell how many were lost. | | Lost ball, data has been lost from buffers. The data filed may tell how many were lost. | ||
|- | |- | ||
| 26 | | 26 | ||
| + | | C | ||
| SUP | | SUP | ||
| Supervisor request (aux circuits). | | Supervisor request (aux circuits). | ||
|- | |- | ||
| 27 | | 27 | ||
| + | | C | ||
| SUR | | SUR | ||
| Supervisor response (aux circuits). | | Supervisor response (aux circuits). | ||
|- | |- | ||
| 30 | | 30 | ||
| + | | C | ||
| AXC | | AXC | ||
| Supervisor string character. | | Supervisor string character. | ||
|- | |- | ||
| 31 | | 31 | ||
| + | | F | ||
| TSP | | TSP | ||
| Test pattern probe. | | Test pattern probe. | ||
|- | |- | ||
| 32 | | 32 | ||
| + | | F | ||
| TSR | | TSR | ||
| Test pattern response. | | Test pattern response. | ||
|- | |- | ||
| 33 | | 33 | ||
| + | | F | ||
| SAD | | SAD | ||
| Host sad. | | Host sad. | ||
|- | |- | ||
| 34 | | 34 | ||
| + | | B | ||
| ECN | | ECN | ||
| Echo on. | | Echo on. | ||
|- | |- | ||
| 35 | | 35 | ||
| + | | B | ||
| ECF | | ECF | ||
| Echo off. | | Echo off. | ||
|- | |- | ||
| 36 | | 36 | ||
| + | | D | ||
| TCS | | TCS | ||
| Term characteristics, first data byte indicates which characteristics second data byte indicates value to set to. | | Term characteristics, first data byte indicates which characteristics second data byte indicates value to set to. | ||
|- | |- | ||
| 37 | | 37 | ||
| + | | C | ||
| TCP | | TCP | ||
| − | | Term | + | | Term characteristics probe, data byte indicates which terminal characteristic were requested. |
|- | |- | ||
| 40 | | 40 | ||
| + | | D | ||
| TCR | | TCR | ||
| − | | Term | + | | Term characteristics response, data is just like TCS, comes in response to a probe; also is reflected by remote when terminal characteristics are sent. |
|- | |- | ||
| 41 | | 41 | ||
| + | | C | ||
| HSI | | HSI | ||
| − | | Host up and | + | | Host up and answering with # of ports in port byte, and host # in data byte. |
|} | |} | ||
Revision as of 06:40, 28 April 2022
This documents the protocol, as used around 1975, between a PDP-10 host and Varian 620 Tymbase.
Messages start with a 4-octet header. More data may optionally follow after the header, depending on the message type.
| Message number | Port | Subtype | Data |
Messages. Any number not in this list is illegal.
| Number | Type | Name | Comment |
| 1 | A | ANS | System is answering. |
| 2 | A | SHT | System is up but shut. |
| 3 | A | CRS | Sender is crashed. |
| 4 | A | DIE | Recipient should crash. |
| 5 | A | NSP | Base taken over by new supervisor. |
| 6 | B | LOG | Login, next 4 data characters are the info about terminal type, and port or origin, then name, etc. |
| 7 | B | AUX | Supervisor response to establishing auxiliary circuit. |
| 10 | B | NOP | Back pressure on. |
| 11 | B | OUP | Back pressure off. |
| 12 | B | GOB | Character gobbler. |
| 13 | B | ZAP | Circuit zapper. |
| 14 | B | EDC | Enter deferred echo mode. |
| 15 | B | LDC | Leave deferred echo mode. |
| 16 | B | GRN | Green ball. |
| 17 | B | RED | Red ball. |
| 20 | B | YEL | Yellow ball. |
| 21 | B | ORG | Orange ball. |
| 22 | B | HNG | Hang character - not used. |
| 23 | B | ETM | Enter 2741 transparent mode. |
| 24 | B | LTM | Leave 2741 transparent mode. |
| 25 | C | LOS | Lost ball, data has been lost from buffers. The data filed may tell how many were lost. |
| 26 | C | SUP | Supervisor request (aux circuits). |
| 27 | C | SUR | Supervisor response (aux circuits). |
| 30 | C | AXC | Supervisor string character. |
| 31 | F | TSP | Test pattern probe. |
| 32 | F | TSR | Test pattern response. |
| 33 | F | SAD | Host sad. |
| 34 | B | ECN | Echo on. |
| 35 | B | ECF | Echo off. |
| 36 | D | TCS | Term characteristics, first data byte indicates which characteristics second data byte indicates value to set to. |
| 37 | C | TCP | Term characteristics probe, data byte indicates which terminal characteristic were requested. |
| 40 | D | TCR | Term characteristics response, data is just like TCS, comes in response to a probe; also is reflected by remote when terminal characteristics are sent. |
| 41 | C | HSI | Host up and answering with # of ports in port byte, and host # in data byte. |
This information comes from the SUMEX-AIM monitor file TYMSRV.MAC, written by Michael A. Heathman in 1975.
