Autosave: 2024-10-22 07:12:24

neuron/c5a35693-1ea8-44ec-bdf5-53955699f359/385af4b4_43ea_4a5f_85a3_5791d95109aa.md

@@ -0,0 +1,17 @@
+---
+tags: [fleeting, networks, ARPANET, packet-switching]
+created: Tuesday, October 22, 2024
+---
+
+# 385af4b4-43ea-4a5f-85a3-5791d95109aa
+
+## _Paul Baran's concept of a distributed network and influence on architecture of the ARPANET_
+
+Baran worked for RAND not ARPA and his work predated the commencement of the
+ARPANET. However his model of a distributed network was highly influential on
+the design of the ARPANET. He served as a consultant to ARPA during the initial
+construction of the ARPANET.
+
+Unlike ARPA, Baran was concerned with command and control and how a
+communication network could be resiliant enough to withstand nuclear conflict.
+He analysed the weaknesses in AT&T's telephone network.

neuron/c5a35693-1ea8-44ec-bdf5-53955699f359/861cc26e_5f59_4615_821d_fe3ee5e1014d.md

@@ -1,5 +1,5 @@
 ---
-tags: [synthesis, computer-history, ARPA]
+tags: [fleeting, computer-history, ARPA]
 created: Monday, October 14, 2024
 ---
 

neuron/c5a35693-1ea8-44ec-bdf5-53955699f359/cfbef1c4_95ea_4fd1_85b8_536492e45e31.md

@@ -0,0 +1,37 @@
+---
+tags: [fleeting, modems, computer-history, internet, bulletin-boards]
+created: Monday, October 14, 2024
+---
+
+# cfbef1c4-95ea-4fd1-85b8-536492e45e31
+
+## _Early precursors to the commercial internet_
+
+Prior to the commercial internet and the advent of the web, there were services
+in the 1980s which allowed home computers to connect to limited public networks.
+Example services: checking one's bank balance, paying bills, transferring money,
+booking holidays.
+
+(Presumably, the services would be hosted on a providers'
+[mainframe](./Mainframe_computers.md) or mini-computer, which the consumer would
+access through something like time-sharing?)
+
+![BT telephone modem](static/modem-bt.png)
+
+The mechanism of connection was via a modem. A device that connected to your
+phone's cradle. Digital signals from your home computer would be converted into
+sound signals ("tones") that would travel through the phone transmitter to a
+receiver at the service provider which you would "dial-up" beforehand.
+
+In the US the main provider was Micronet in the 1970s, which became Compuserve
+in the 1980s and eventually AOL in the 1990s. In the UK there was Prestel
+provided by BT, first introduced in 1971.
+
+These services had an expensive subscription model and consequently uptake was
+limited.
+
+In addition there were bulletin board systems (BBS), typically administrated by
+hobbyists. Their personal computers acted as servers that other users would
+dial-up to access. They permitted the sharing of news and messages and later
+chat-rooms for realtime communication. Some of the biggest BBSs later became the
+first ISPs.

neuron/c5a35693-1ea8-44ec-bdf5-53955699f359/index.md

@@ -11,24 +11,25 @@ is a [Zettelkasten](https://en.wikipedia.org/wiki/Zettelkasten) work in progress
 comprising notes from my self-directed study of software engineering and
 computer science.
  
-**Build ID:** 4e98d18e-1a79-4e78-a4ac-f7e3a2de9887
+**Build ID:** c5a35693-1ea8-44ec-bdf5-53955699f359
 
-**Published:** Mon 21 Oct 2024 23:11:47
+**Published:** Tue 22 Oct 2024 07:12:22
 
 ### Recent edits 
 
+- [[385af4b4_43ea_4a5f_85a3_5791d95109aa]] 
+- [[cfbef1c4_95ea_4fd1_85b8_536492e45e31]] 
 - [[861cc26e_5f59_4615_821d_fe3ee5e1014d]] 
 - [[Compile_Python_app_to_single_executable]] 
 - [[VirtualMemory]] 
 - [[Zero_property_of_multiplication]] 
 - [[Working_with_CSVs_in_Python]] 
 - [[Variables_and_data_types_in_Bash]] 
-- [[Validity_and_entailment]] 
-- [[Utilities_operators_flags]] 
 
 
-### All notes (462) 
+### All notes (464) 
 
+- [[385af4b4_43ea_4a5f_85a3_5791d95109aa]] 
 - [[861cc26e_5f59_4615_821d_fe3ee5e1014d]] 
 - [[API_Gateway]] 
 - [[AWS_CLI]] 
@@ -481,6 +482,7 @@ computer science.
 - [[Working_with_numbers_in_Bash]] 
 - [[Zero_property_of_multiplication]] 
 - [[Zip_function_in_Python]] 
+- [[cfbef1c4_95ea_4fd1_85b8_536492e45e31]] 
 - [[fs]] 
 - [[http_in_Node]] 
 - [[journald]] 

zk/385af4b4_43ea_4a5f_85a3_5791d95109aa.md

@@ -0,0 +1,17 @@
+---
+tags: [fleeting, networks, ARPANET, packet-switching]
+created: Tuesday, October 22, 2024
+---
+
+# 385af4b4-43ea-4a5f-85a3-5791d95109aa
+
+## _Paul Baran's concept of a distributed network and influence on architecture of the ARPANET_
+
+Baran worked for RAND not ARPA and his work predated the commencement of the
+ARPANET. However his model of a distributed network was highly influential on
+the design of the ARPANET. He served as a consultant to ARPA during the initial
+construction of the ARPANET.
+
+Unlike ARPA, Baran was concerned with command and control and how a
+communication network could be resiliant enough to withstand nuclear conflict.
+He analysed the weaknesses in AT&T's telephone network.

zk/861cc26e_5f59_4615_821d_fe3ee5e1014d.md

@@ -1,5 +1,5 @@
 ---
-tags: [synthesis, computer-history, ARPA]
+tags: [fleeting, computer-history, ARPA]
 created: Monday, October 14, 2024
 ---
 

zk/cfbef1c4_95ea_4fd1_85b8_536492e45e31.md

@@ -0,0 +1,37 @@
+---
+tags: [fleeting, modems, computer-history, internet, bulletin-boards]
+created: Monday, October 14, 2024
+---
+
+# cfbef1c4-95ea-4fd1-85b8-536492e45e31
+
+## _Early precursors to the commercial internet_
+
+Prior to the commercial internet and the advent of the web, there were services
+in the 1980s which allowed home computers to connect to limited public networks.
+Example services: checking one's bank balance, paying bills, transferring money,
+booking holidays.
+
+(Presumably, the services would be hosted on a providers'
+[mainframe](./Mainframe_computers.md) or mini-computer, which the consumer would
+access through something like time-sharing?)
+
+![BT telephone modem](../img/modem-bt.png)
+
+The mechanism of connection was via a modem. A device that connected to your
+phone's cradle. Digital signals from your home computer would be converted into
+sound signals ("tones") that would travel through the phone transmitter to a
+receiver at the service provider which you would "dial-up" beforehand.
+
+In the US the main provider was Micronet in the 1970s, which became Compuserve
+in the 1980s and eventually AOL in the 1990s. In the UK there was Prestel
+provided by BT, first introduced in 1971.
+
+These services had an expensive subscription model and consequently uptake was
+limited.
+
+In addition there were bulletin board systems (BBS), typically administrated by
+hobbyists. Their personal computers acted as servers that other users would
+dial-up to access. They permitted the sharing of news and messages and later
+chat-rooms for realtime communication. Some of the biggest BBSs later became the
+first ISPs.