M9301 ROM - Revision history

Jnc: /* External links */ Bitsavers has reorganized a bit

2026-10-05T14:09:47Z

External links: Bitsavers has reorganized a bit

← Older revision		Revision as of 14:09, 5 October 2026
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	==External links==		==External links==

	* [http://www.bitsavers.org/pdf/dec/unibus/EK-M9301-TM-001_M9301_Bootstrap_Terminator_Module_Maintenance_and_Operators_Manual_Jun77.pdf M9301 bootstrap/terminator module maintenance and operator's manual] (EK-M9301-TM-001)		* [http://www.bitsavers.org/pdf/dec/unibus/M9301/EK-M9301-TM-001_M9301_Bootstrap_Terminator_Module_Maintenance_and_Operators_Manual_Jun77.pdf M9301 bootstrap/terminator module maintenance and operator's manual] (EK-M9301-TM-001)
	* [http://www.bitsavers.org/pdf/dec/unibus/M9301_RevV_Engineering_Drawings_Dec77.pdf UNIBUS Terminator/Bootstrap Engineering Drawings]		* [http://www.bitsavers.org/pdf/dec/unibus/M9301/M9301_RevV_Engineering_Drawings_Dec77.pdf UNIBUS Terminator/Bootstrap Engineering Drawings]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]

Jnc: /* External links */ typos

2021-12-07T17:41:37Z

External links: typos

← Older revision		Revision as of 17:41, 7 December 2021
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	* [[UNIBUS boot ROMs]]		* [[UNIBUS boot ROMs]]

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

	* [http://www.bitsavers.org/pdf/dec/unibus/EK-M9301-TM-001_M9301_Bootstrap_Terminator_Module_Maintenance_and_Operators_Manual_Jun77.pdf M9301 bootstrap/terminator module maintenance and operator's manual] (EK-M9301-TM-001)		* [http://www.bitsavers.org/pdf/dec/unibus/EK-M9301-TM-001_M9301_Bootstrap_Terminator_Module_Maintenance_and_Operators_Manual_Jun77.pdf M9301 bootstrap/terminator module maintenance and operator's manual] (EK-M9301-TM-001)
	* [www.bitsavers.org/pdf/dec/unibus/M9301_RevV_Engineering_Drawings_Dec77.pdf UNIBUS Terminator/Bootstrap Engineering Drawings]		* [http://www.bitsavers.org/pdf/dec/unibus/M9301_RevV_Engineering_Drawings_Dec77.pdf UNIBUS Terminator/Bootstrap Engineering Drawings]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]

Jnc: /* External links */ +Manual, eng drws

2021-12-07T17:40:02Z

External links: +Manual, eng drws

← Older revision		Revision as of 17:40, 7 December 2021
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	* [[UNIBUS boot ROMs]]		* [[UNIBUS boot ROMs]]

	~~==Reference==~~		==External links===

	* EK-M9301-TM-001, ''M9301 bootstrap/terminator module''

	==External links==

			* [http://www.bitsavers.org/pdf/dec/unibus/EK-M9301-TM-001_M9301_Bootstrap_Terminator_Module_Maintenance_and_Operators_Manual_Jun77.pdf M9301 bootstrap/terminator module maintenance and operator's manual] (EK-M9301-TM-001)
			* [www.bitsavers.org/pdf/dec/unibus/M9301_RevV_Engineering_Drawings_Dec77.pdf UNIBUS Terminator/Bootstrap Engineering Drawings]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YA.mac Disassembled and commented M9301-YA ROM code]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac Disassembled and partially commented M9301-YB ROM code]

Jnc: /* Configuration switches */ power-up vector forcing method

2021-12-06T11:12:39Z

Configuration switches: power-up vector forcing method

← Older revision		Revision as of 11:12, 6 December 2021
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	If S1-1 is set to 'off' (open), the low bank of memory on the card (765000-765777) is disabled; when 'on' (closed) it is enabled.		If S1-1 is set to 'off' (open), the low bank of memory on the card (765000-765777) is disabled; when 'on' (closed) it is enabled.

	If S1-2 is 'off', the system will power-up normally; if 'on', the CPU will obtain its new PC/PS pair from locations 173024 on the card, which contain a mixture of bits from the ROM (high bits) and the configuration switch (low bits), which can be used to force the CPU to start executing in the ROM on power-on.		If S1-2 is 'off', the system will power-up normally; if 'on', the CPU will obtain its new PC/PS pair from locations 173024 on the card, which contain a mixture of bits from the ROM (high bits) and the configuration switch (low bits), which can be used to force the CPU to start executing in the ROM on power-on. (This is done by asserting the appropriate high address lines on the UNIBUS for the first two bus cycles after power-up; a technique pioneered by the [[BM873 ROM]].)

	Switches S1-3 through S1-10 contain bits 8 through 1 of the power-on PC (above); the exact meaning will depend on the board variant (below).		Switches S1-3 through S1-10 contain bits 8 through 1 of the power-on PC (above); the exact meaning will depend on the board variant (below).

Jnc: +img

2021-12-05T02:01:52Z

+img

← Older revision		Revision as of 02:01, 5 December 2021
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	The '''M9301 ~~[[Read-only memory\|~~ROM]]''' card was a [[UNIBUS]] card for the [[PDP-11]] series of computers. It contained 512 words of memory, all readable directly from the UNIBUS (i.e. not windowed). A [[Dual Inline Package\|DIP]] switch bank provided configuration. The M9301 also provided [[terminator\|termination]] for the UNIBUS.		[[Image:M9301.jpg\|250px\|thumb\|right\|M9301 card]]

			The '''M9301 ROM''' card was a [[UNIBUS]] [[Read-only memory\|ROM]] card for the [[PDP-11]] series of computers. It contained 512 words of memory, all readable directly from the UNIBUS (i.e. not windowed). A [[Dual Inline Package\|DIP]] switch bank provided configuration. The M9301 also provided [[terminator\|termination]] for the UNIBUS.

	It was a [[DEC card form factor\|dual]] format card, intended for use in the [[DEC edge connector contact identification\|two top (AB) connectors]] of a [[Modified UNIBUS Device\|MUD]] slot, or in a UNIBUS in/out slot.		It was a [[DEC card form factor\|dual]] format card, intended for use in the [[DEC edge connector contact identification\|two top (AB) connectors]] of a [[Modified UNIBUS Device\|MUD]] slot, or in a UNIBUS in/out slot.

Jnc: Better cat

2021-08-22T08:42:00Z

Better cat

← Older revision		Revision as of 08:42, 22 August 2021
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	[[Category: UNIBUS ROMs]]		[[Category: UNIBUS ROMs]]
	~~[[Category: DEC Boards]]~~

Jnc: avoid redir

2020-10-29T16:58:41Z

avoid redir

← Older revision		Revision as of 16:58, 29 October 2020
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	==Variants==		==Variants==

	* M9301-YA - (ROMs 034A9, 035A9, 036A9, 037A9) - [[PDP-11/04]] and [[PDP-11/34]] [[Original Equipment Manufacturer\|OEM]] version; had basic diagnostics, console emulator, booted from various devices ([[RK11]] and [[RP11]] disks, [[TC11]] [[DECtape]], [[TM11]] magnetic tape, serial line, [[PC11]] high-speed paper-tape reader, [[TA11]] casette tape, [[RX11]] 8-inch [[floppy disk]]), supported auto-boot on power on, and also power-fail restart		* M9301-YA - (ROMs 034A9, 035A9, 036A9, 037A9) - [[PDP-11/04]] and [[PDP-11/34]] [[Original Equipment Manufacturer\|OEM]] version; had basic diagnostics, console emulator, booted from various devices ([[RK11 disk controller\|RK11]] and [[RP11 disk controller\|RP11]] disks, [[TC11]] [[DECtape]], [[TM11]] magnetic tape, serial line, [[PC11]] high-speed paper-tape reader, [[TA11]] casette tape, [[RX11 floppy disk controller\|RX11]] 8-inch [[floppy disk]]), supported auto-boot on power on, and also power-fail restart

	* M9301-YB - (ROMs 038A9, 039A9, 040A9, 041A9) - /04 and /34 end user version; had basic diagnostics, console emulator, booted from various devices (RK11, RP11, TC11, TM11, TA11, RX11, serial line, high-speed paper-tape reader, RJS, RJP, TJU), also power-fail restart		* M9301-YB - (ROMs 038A9, 039A9, 040A9, 041A9) - /04 and /34 end user version; had basic diagnostics, console emulator, booted from various devices (RK11, RP11, TC11, TM11, TA11, RX11, serial line, high-speed paper-tape reader, RJS, RJP, TJU), also power-fail restart

	* M9301-YC - [[PDP-11/70]] version; contained basic CPU, cache and memory diagnostics, booted from various devices (TM11, TC11, RK11, RP11, [[~~RK06~~]], RJS, RJP, TJU, RX11)		* M9301-YC - [[PDP-11/70]] version; contained basic CPU, cache and memory diagnostics, booted from various devices (TM11, TC11, RK11, RP11, [[RK611 disk controller\|RK611]], RJS, RJP, TJU, RX11)

	* M9301-YD - All models; contained code to allow a terminal attached to the machine to be a terminal on some other line; also had boot code for RX11 and [[DDCMP]]		* M9301-YD - All models; contained code to allow a terminal attached to the machine to be a terminal on some other line; also had boot code for RX11 and [[DDCMP]]

Jnc: +cats

2018-12-16T15:10:18Z

+cats

← Older revision		Revision as of 15:10, 16 December 2018
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	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YF.mac Disassembled and partially commented M9301-YF ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YF.mac Disassembled and partially commented M9301-YF ROM code]
	* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YH.mac Disassembled but mostly un-commented M9301-YH ROM code]		* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YH.mac Disassembled but mostly un-commented M9301-YH ROM code]

			[[Category: UNIBUS ROMs]]
			[[Category: DEC Boards]]

Jnc: /* M9301-YF */ Note manual conflict

2018-09-10T21:14:46Z

M9301-YF: Note manual conflict

← Older revision		Revision as of 21:14, 10 September 2018
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	Note that switch S1-1 must be on for all the choices ''with'' diagnostics, and also the console emulation and power-fail restart choices.		Note that switch S1-1 must be on for all the choices ''with'' diagnostics, and also the console emulation and power-fail restart choices.

			''*'' - The manual gives the 16540x locations for manual start locations, but the configuration DIP switch settings correspond to the 17300x locations.

	==See also==		==See also==

Jnc: /* Entry points */ Add -YB, -YF

2018-09-10T21:07:49Z

Entry points: Add -YB, -YF

@@ Line 82: / Line 82: @@
 | 173626 || TA11 Boot (no diagnostics)
 |-
-| 173640 || RX11 Boot w/ Diagnostics
+| 173636 || RX11 Boot w/ Diagnostics
 |-
-| 173642 || RX11 Boot (no diagnostics)
+| 173640 || RX11 Boot (no diagnostics)
 |-
 | 173650 || DL11 Boot w/ Diagnostics
@@ Line 94: / Line 94: @@
 | 173662 || PC11 Boot (no diagnostics)
 |}
 ==See also==

← Older revision		Revision as of 02:01, 5 December 2021
Line 1:		Line 1:
	The '''M9301 ~~[[Read-only memory\|~~ROM]]''' card was a [[UNIBUS]] card for the [[PDP-11]] series of computers. It contained 512 words of memory, all readable directly from the UNIBUS (i.e. not windowed). A [[Dual Inline Package\|DIP]] switch bank provided configuration. The M9301 also provided [[terminator\|termination]] for the UNIBUS.		[[Image:M9301.jpg\|250px\|thumb\|right\|M9301 card]]

			The '''M9301 ROM''' card was a [[UNIBUS]] [[Read-only memory\|ROM]] card for the [[PDP-11]] series of computers. It contained 512 words of memory, all readable directly from the UNIBUS (i.e. not windowed). A [[Dual Inline Package\|DIP]] switch bank provided configuration. The M9301 also provided [[terminator\|termination]] for the UNIBUS.

	It was a [[DEC card form factor\|dual]] format card, intended for use in the [[DEC edge connector contact identification\|two top (AB) connectors]] of a [[Modified UNIBUS Device\|MUD]] slot, or in a UNIBUS in/out slot.		It was a [[DEC card form factor\|dual]] format card, intended for use in the [[DEC edge connector contact identification\|two top (AB) connectors]] of a [[Modified UNIBUS Device\|MUD]] slot, or in a UNIBUS in/out slot.