Running an LSI-11 from UNIX V6 - Revision history

Jnc: rm bloat

2023-07-02T16:25:23Z

rm bloat

Jnc: Jnc moved page Running an LSI-11 from Unix V6 to Running an LSI-11 from UNIX V6: Consistent caps

2021-03-10T16:49:14Z

Jnc moved page Running an LSI-11 from Unix V6 to Running an LSI-11 from UNIX V6: Consistent caps

Jnc: ,imor copyedit

2020-09-19T15:23:31Z

,imor copyedit

Jnc: /* External links */ reloc

2020-09-15T16:00:26Z

‎External links: reloc

Jnc: /* External links */ +tty.h; relocate

2020-09-15T13:35:01Z

‎External links: +tty.h; relocate

Jnc: + output delay codes

2020-09-14T11:50:15Z

+ output delay codes

Jnc: + parity on output

2020-09-14T03:04:29Z

+ parity on output

Jnc: +See also

2019-03-03T01:47:23Z

+See also

Jnc: +cat

2018-12-14T13:51:47Z

+cat

Jnc: add missing detail/code

2016-12-23T00:17:33Z

add missing detail/code

@@ Line 31: / Line 31: @@
 *[http://ana-3.lcs.mit.edu/~jnc/tech/unix/sys/dl.c dl.c]
 *[http://ana-3.lcs.mit.edu/~jnc/tech/unix/ttytalk.c ttytalk.c]
 [[Category: UNIX Practical Guides‎]]

@@ Line 3: / Line 3: @@
 If one connects the LSI-11's [[asynchronous serial line]] console to a serial line on the Unix V6 machine (either real or simulated), a program ('ttytalk', see below) exists to allow a user logged into the Unix machine to talk to the console, load programs into it, etc.
-One issue with doing so on Unix 'vanilla' V6 is that it insists on sending a [[parity]] bit on all output characters to a serial line, and there is no way to disable that. Also, the user-called top end of the serial line [[device driver]] output code inserts bytes with the high bit set into the output queue, to indicate the inter-character delays which some (e.g. 'carriage return') needed after some characters to support the [[printing terminal]]s of the day. Finally, probably to support all the above, it explicitly does not allow 8-bit output on serial lines; this capability is needed to load binary files into the LSI-11. Several small change to the shared serial line driver, dmr/tty.c, fix these issues.
+One issue with doing so on Unix 'vanilla' V6 is that it insists on sending a [[parity]] bit on all output characters to a serial line, and there is no way to disable that. Also, the user-called top end of the serial line [[device driver]] output code inserts bytes with the high bit set into the output queue, to indicate the inter-character delays needed after some characters (e.g. 'carriage return') to support many of the [[printing terminal]]s of the day. Finally, probably to support all the above, it explicitly does not allow 8-bit output on serial lines; this capability is needed to load binary files into the LSI-11. Several small change to the shared serial line driver, dmr/tty.c, fix these issues.
 Since the mode word in stty/gtty is already full, one has to extend the device interface to support setting and clearing 8-bit output support. One can either add ioctl() or do an upward-compatible extension to stty/gtty (see external link below); the code below takes the latter tack.

@@ Line 26: / Line 26: @@
 ==External links==
-*[http://www.chiappa.net/~jnc/tech/newtty.txt Extended TTY Modes, and User Interface]
+*[http://ana-3.lcs.mit.edu/~jnc/tech/unix/newtty.txt Extended TTY Modes, and User Interface]
 *[http://ana-3.lcs.mit.edu/~jnc/tech/unix/sys/tty.h tty.h]
 *[http://ana-3.lcs.mit.edu/~jnc/tech/unix/sys/tty.c tty.c]

@@ Line 27: / Line 27: @@
 *[http://www.chiappa.net/~jnc/tech/newtty.txt Extended TTY Modes, and User Interface]
-*[http://ana-3.lcs.mit.edu/~jnc/tech/unix/tty.c tty.c]
+*[http://ana-3.lcs.mit.edu/~jnc/tech/unix/sys/tty.h tty.h]
-*[http://ana-3.lcs.mit.edu/~jnc/tech/unix/dl.c dl.c]
+*[http://ana-3.lcs.mit.edu/~jnc/tech/unix/sys/tty.c tty.c]
 *[http://ana-3.lcs.mit.edu/~jnc/tech/unix/ttytalk.c ttytalk.c]

@@ Line 1: / Line 1: @@
-It is relatively easy to run a hardware [[LSI-11]] (or [[PDP-11/23]], [[PDP-11/73]], etc, although this article will use the term 'LSI-11') from a [[PDP-11]] (either real or simulated) running [[UNIX Sixth Edition|Unix V6]].
+It is relatively easy to run a hardware [[LSI-11]] (or [[PDP-11/23]], [[PDP-11/73]], etc, although this article will use the term 'LSI-11' for all of them) from a [[PDP-11]] (either real or simulated) running [[UNIX Sixth Edition|Unix V6]].
 If one connects the LSI-11's [[asynchronous serial line]] console to a serial line on the Unix V6 machine (either real or simulated), a program ('ttytalk', see below) exists to allow a user logged into the Unix machine to talk to the console, load programs into it, etc.
-One issue is that Unix 'vanilla' V6 insists on sending a [[parity]] bit on all output characters to a serial line, and there is no way to disable that. Also, it does not allow 8-bit output on serial lines; this capability is needed to load binary files into the LSI-11. A small change to the shared serial line driver, dmr/tty.c, fixes these issues.
+One issue with doing so on Unix 'vanilla' V6 is that it insists on sending a [[parity]] bit on all output characters to a serial line, and there is no way to disable that. Also, the user-called top end of the serial line [[device driver]] output code inserts bytes with the high bit set into the output queue, to indicate the inter-character delays which some (e.g. 'carriage return') needed after some characters to support the [[printing terminal]]s of the day. Finally, probably to support all the above, it explicitly does not allow 8-bit output on serial lines; this capability is needed to load binary files into the LSI-11. Several small change to the shared serial line driver, dmr/tty.c, fix these issues.
 Since the mode word in stty/gtty is already full, one has to extend the device interface to support setting and clearing 8-bit output support. One can either add ioctl() or do an upward-compatible extension to stty/gtty (see external link below); the code below takes the latter tack.

← Older revision	Revision as of 16:49, 10 March 2021
(No difference)

← Older revision		Revision as of 01:47, 3 March 2019
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	The current code is somewhat inelegant, since the generic code to recognize the extended interface is currently in the serial line driver (dl.c), and not in the stty() system call code (since moving it there would mean adding entries in cdevsw[], and it was desired to minimize the number of modules that were changed).		The current code is somewhat inelegant, since the generic code to recognize the extended interface is currently in the serial line driver (dl.c), and not in the stty() system call code (since moving it there would mean adding entries in cdevsw[], and it was desired to minimize the number of modules that were changed).
		+
		+	==See also==
		+
		+	* [[UNIX V6 internals]]
		+	* [[Unix V6 kernel memory layout]]
		+	** [[Unix V6 dump analysis]]
		+	* [[Installing UNIX Sixth Edition]]
		+	** [[Setting up UNIX Sixth Edition]]
		+	** [[Upgrading UNIX Sixth Edition]]
		+	** [[Running UNIX V6 on an -11/23]]
		+	* [[Installing Unix v6 (PDP-11) on SIMH]]
		+	** [[Running Unix v6 in SIMH]]
		+	* [[Installing UNIX Sixth Edition on Ersatz-11]]

	==External links==		==External links==

@@ Line 1: / Line 1: @@
-It is relatively easy to run a hardware [[LSI-11]] (or [[PDP-11/23]], [[PDP-11/73]], etc, although this article will use the term 'LSI-11') from a PDP-11 (either real or simulated) running Unix V6.
+It is relatively easy to run a hardware [[LSI-11]] (or [[PDP-11/23]], [[PDP-11/73]], etc, although this article will use the term 'LSI-11') from a [[PDP-11]] (either real or simulated) running [[UNIX Sixth Edition|Unix V6]].
-If one connects the LSI-11's serial line console to a serial line on the Unix V6 machine (either real or simulated), a program ('ttytalk', see below) exists to allow a user logged into the Unix machine to talk to the console, load programs into it, etc.
+If one connects the LSI-11's [[asynchronous serial line]] console to a serial line on the Unix V6 machine (either real or simulated), a program ('ttytalk', see below) exists to allow a user logged into the Unix machine to talk to the console, load programs into it, etc.
 One issue is that Unix V6 does not allow 8-bit output on serial lines; this capability is needed to load binary files into the LSI-11. A small change to the shared serial line driver, dmr/tty.c, allows this.
@@ Line 19: / Line 19: @@
 {{PDP-11}}