BDV11 Bus Terminator/ROM - Revision history

Jnc: /* Further reading */ +Location of W13 on the BDV11

2024-07-28T18:45:44Z

‎Further reading: +Location of W13 on the BDV11

Jnc: Avoid redirs; typos

2024-06-24T08:05:59Z

Avoid redirs; typos

Jnc: +image

2023-07-10T00:01:42Z

+image

Jnc: /* External links */ +manual, FMPS

2023-07-02T18:48:26Z

‎External links: +manual, FMPS

Jnc: rm bloat

2023-06-30T18:34:42Z

rm bloat

Jnc: avoid redir

2020-04-28T17:26:26Z

avoid redir

Jnc: Avoid dab page

2019-08-18T16:01:05Z

Avoid dab page

Jnc: better cat

2018-12-07T02:19:50Z

better cat

Jnc: +cat

2018-12-06T20:08:29Z

+cat

Jnc: /* KW11-L issue */ Front panel switches often toggle power OK, which does clear it

2018-01-16T15:17:31Z

‎KW11-L issue: Front panel switches often toggle power OK, which does clear it

@@ Line 42: / Line 42: @@
 * Add a wire from BE1 (BDAL20) to E1 pin 13
 * Add a wire from BF1 (BDAL21) to E1 pin 12
 ==External links==

@@ Line 11: / Line 11: @@
 The board is normally supplied with 2KW of PROM containing diagnostic and bootstrap functionality, with an optional 2KW for more; there are also sockets available for an additional 18KW of user-supplied [[EPROM]]. This memory does not appear directly on the QBUS; a 256 word window, and a window control [[register]], allows the entire contents to be seen.
-In addition, the board provides a pair of [[DIP switch]]es (readable under program control, except for one used for KW11-L functionality control); and also a set of red [[LED]]s, a 'power OK' green LED, on-board RESET and HALT/ENABLE switches, and test points for on-board voltages. All of the latter are on the card edge, so they are accessible when it is plugged in. A single read/write [[register]] is provided for diagnostic purposes.
+In addition, the board provides a pair of [[DIP switch]]es (readable under program control, except for one used for KW11-L functionality control); and also a set of red [[Light Emitting Diode|LEDs]], a 'power OK' green LED, on-board RESET and HALT/ENABLE switches, and test points for on-board voltages. All of the latter are on the card edge, so they are accessible when it is plugged in. A single read/write [[register]] is provided for diagnostic purposes.
 ==KW11-L functionality==
@@ Line 25: / Line 25: @@
 The ''only'' thing that clears it is either a manual disable (write 0 to the KW11-L's CSR); something which toggles the BDCOK bus line - e.g. using the BDV11's on-board RESTART switch, or a front-panel restart switch; or power cycling the machine.
-''Caveat haquur!''
+'''Caveat haquur!'''
 ==Board layout error==
-There is a layout error on the BDV11 which can cause damage if a BDV11 is plugged into a system with the optional -12V on pin AB2. The trace which is supposed to connect bus line BIRQ6, on pin AB1, to the pullup network is incorrectly routed to pin AB2. The [[ECO]] to repair this (DEC #2 for the BDV11) is fairly simple:
+There is a layout error on the BDV11 which can cause damage if a BDV11 is plugged into a system with the optional -12V on pin AB2. The [[trace]] which is supposed to connect bus line BIRQ6, on pin AB1, to the pullup network is incorrectly routed to pin AB2. The [[Engineering Change Order|ECO]] to repair this (DEC #2 for the BDV11) is fairly simple:
 * Cut the trace (on the solder side) between E1 pin 11 and AB2
@@ Line 36: / Line 36: @@
 ==Bus termination upgrade==
-The BDV11 only provides termination for a Q18 QBUS; there is a relatively easy offical DEC ECO (#5) to extend it to Q22, since there are 4 spare [[resistor]] networks available in one of the resistor packs. It is:
+The BDV11 only provides termination for a Q18 QBUS; there is a relatively easy official DEC ECO (#5) to extend it to Q22, since there are 4 spare [[resistor]] networks available in one of the resistor packs. It is:
-* Add a wire from BC1 (BDAL18) to E1 pin 1-5
+* Add a wire from BC1 (BDAL18) to E1 pin 15
 * Add a wire from BD1 (BDAL19) to E1 pin 14
 * Add a wire from BE1 (BDAL20) to E1 pin 13
@@ Line 48: / Line 48: @@
 * [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Products_Handbook_1985.pdf Microcomputer Products Handbook] - the BDV11 is covered in Appendix C (pp. 593-600 of the PDF)
 * [http://www.bitsavers.org/pdf/dec/qbus/EK-BDV11-TM-001_Mar78.pdf BDV11 bus terminator, bootstrap, and diagnostic ROM technical manual] (EK-BDV11-TM-001)
-* [http://bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP-11/23 Field Maintenance Print Set] (MP00740) - BDV11-A Field Maintenance Print Set (MP00489) is on pp. 16-31 of the PDF
+* [http://www.bitsavers.org/pdf/dec/qbus/MP00489_BDV11_Sep77.pdf BDV11-A Field Maintenance Print Set] (MP00489)
 * [https://avitech.com.au/?page_id=3407 BDV11 Upgrade]
 [[Category: QBUS ROMs]]

@@ Line 1: / Line 1: @@
 The '''BDV11 Bus Terminator/ROM''' board is a [[QBUS]] board that includes:
@@ Line 5: / Line 7: @@
 * [[KW11-L Line Time Clock]] functionality
-Physically, it is a [[DEC card form factor|quad]] board, the M8012.
+Physically, it is a [[DEC card form factor|quad]] board, the '''M8012'''.
-The board is normally supplied with 2KW of PROM containing diagnostic and bootstrap functionality, with an optional 2KW for more; there are also sockets available for an additional 18KW of user-supplied [[EPROM]]. This memory does not appear directly on the QBUS; a 256 word window, and a window control register, allows the entire contents to be seen.
+The board is normally supplied with 2KW of PROM containing diagnostic and bootstrap functionality, with an optional 2KW for more; there are also sockets available for an additional 18KW of user-supplied [[EPROM]]. This memory does not appear directly on the QBUS; a 256 word window, and a window control [[register]], allows the entire contents to be seen.
-In addition, the board provides a pair of DIP switches (readable under program control, except for one used for KW11-L functionality control); and also a set of red [[LED]]s, a 'power OK' green LED, on-board RESET and HALT/ENABLE switches, and test points for on-board voltages. All of the latter are on the card edge, so they are accessible when it is plugged in. A single read/write [[register]] is provided for diagnostic purposes.
+In addition, the board provides a pair of [[DIP switch]]es (readable under program control, except for one used for KW11-L functionality control); and also a set of red [[LED]]s, a 'power OK' green LED, on-board RESET and HALT/ENABLE switches, and test points for on-board voltages. All of the latter are on the card edge, so they are accessible when it is plugged in. A single read/write [[register]] is provided for diagnostic purposes.
 ==KW11-L functionality==
@@ Line 44: / Line 46: @@
 * [http://www.bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Interfaces_Handbook_1980.pdf microcomputer interfaces handbook] - BDV11 is covered on pp. 86-113, 94-121 of the PDF
 * [http://www.bitsavers.org/pdf/dec/qbus/EK-BDV11-TM-001_Mar78.pdf BDV11 bus terminator, bootstrap, and diagnostic ROM technical manual] (EK-BDV11-TM-001)
 * [http://bitsavers.org/pdf/dec/qbus/MP00740_1123_schem_Oct81.pdf PDP-11/23 Field Maintenance Print Set] (MP00740) - BDV11-A Field Maintenance Print Set (MP00489) is on pp. 16-31 of the PDF

@@ Line 5: / Line 5: @@
 * [[KW11-L Line Time Clock]] functionality
-Physically, it is a [[DEC card form factor|quad]] board, M8012.
+Physically, it is a [[DEC card form factor|quad]] board, the M8012.
 The board is normally supplied with 2KW of PROM containing diagnostic and bootstrap functionality, with an optional 2KW for more; there are also sockets available for an additional 18KW of user-supplied [[EPROM]]. This memory does not appear directly on the QBUS; a 256 word window, and a window control register, allows the entire contents to be seen.
@@ Line 36: / Line 36: @@
 The BDV11 only provides termination for a Q18 QBUS; there is a relatively easy offical DEC ECO (#5) to extend it to Q22, since there are 4 spare [[resistor]] networks available in one of the resistor packs. It is:
-* Add a wire from BC1 (BDAL18) to E1 pin 15
+* Add a wire from BC1 (BDAL18) to E1 pin 1-5
 * Add a wire from BD1 (BDAL19) to E1 pin 14
 * Add a wire from BE1 (BDAL20) to E1 pin 13
 * Add a wire from BF1 (BDAL21) to E1 pin 12
 [[Category: QBUS ROMs]]

@@ Line 40: / Line 40: @@
 * Add a wire from BE1 (BDAL20) to E1 pin 13
 * Add a wire from BF1 (BDAL21) to E1 pin 12
 [[Category: QBUS ROMs]]

@@ Line 19: / Line 19: @@
 '''''NOTE''''': Once the KW11-L on a BDV11 has been enabled, RESET/etc do '''not''' disable it, unlike every other device in the [[PDP-11]] universe! (This is apparently because they were short a QBUS receiver for the BINIT bus line, and didn't want to add another complete chip to be able to monitor it.)
-So if you start some [[operating system]] which enables the KW11-L (e.g. [[UNIX]]), and then try and re-boot it by halting the machine and using the 'Go' command to [[ODT]], you'll probably get a clock [[interrupt]] in the process of booting, which will trash it.
+So if you start some [[operating system]] which enables the KW11-L (e.g. [[UNIX]]), and then try and re-boot it by halting the machine and using the 'Go' command to [[QBUS CPU ODT|ODT]], you'll probably get a clock [[interrupt]] in the process of booting, which will trash it.
 The ''only'' thing that clears it is either a manual disable (write 0 to the KW11-L's CSR); something which toggles the BDCOK bus line - e.g. using the BDV11's on-board RESTART switch, or a front-panel restart switch; or power cycling the machine.

← Older revision		Revision as of 02:19, 7 December 2018
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	{{PDP-11}}		{{PDP-11}}

−	[[Category: QBUS]]	+	[[Category: QBUS ROMs]]

← Older revision		Revision as of 20:08, 6 December 2018
Line 42:		Line 42:

	{{PDP-11}}		{{PDP-11}}
		+
		+	[[Category: QBUS]]