RH11 MASSBUS controller: Difference between revisions
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The '''RH11 MASSBUS controller''' allowed the interconnection of [[MASSBUS]] devices such as the [[RP04 disk drive|RP04]] to systems with a [[UNIBUS]], primarily [[PDP-11]]'s. | The '''RH11 MASSBUS controller''' allowed the interconnection of [[MASSBUS]] devices such as the [[RP04 disk drive|RP04]] to systems with a [[UNIBUS]], primarily [[PDP-11]]'s. | ||
The RH11 | The RH11 has the capability to operate in 18-bit mode; in this mode (used in the [[UC15]] UNICHANNEL-15 on the [[PDP-15]]), the PA and PB UNIBUS lines are used for data bits 16 and 17. | ||
As is standard for the MASSBUS, all the device | ==Registers== | ||
The RH11 contains 4 registers, plus a share of a fifth; they are | |||
* RHCS1 - Control and Status 1 (shared) | |||
* RHWC - Word Count | |||
* RHBA - Bus Address | |||
* RHCS2 - Control and Status 2 | |||
* RHDB - Data Buffer (for maintenance) | |||
As is standard for the MASSBUS, all the other device registers are in the device. | |||
==Hardware== | |||
The RH11 consisted of a double [[system unit]] [[backplane]] into which plugged a number of cards: | |||
Two of them [[DEC card form factor|hex]]-sized: | |||
* M7294 - DBC - Data Buffer and Control | |||
* M7295 - BCT - Bus Control | |||
Two [[DEC card form factor|dual]]-sized cards containing controller logic: | |||
* M7296 - CSR - Control and Status | |||
* M7297 - PAC - Parity Generation and Checking | |||
Three [[DEC card form factor|dual]]-height M5904 MASSBUS transceiver modules. | |||
Optionally one or two (see below) [[DEC card form factor|single]]-height cards: | |||
* M688 - UNIBUS Power Fail Driver | |||
The RH11 backplane also contained three [[Small Peripheral Controller|SPC]] slots in otherwise-unused slots. | |||
==Second UNIBUS== | |||
The RH11 contains connectors and circuitry for two separate UNIBUSes; the second UNIBUS is primarily used on systems with [[multi-port memory]], such as the [[PDP-11/45]]. If no [[Central Processing Unit|CPU]] is connected to UNIBUS B, an M9300 terminator at the start of the bus can be configured to do [[Non-Processor Request|NPR]] grants. A jumper allows the RH11 to do block transfers on UNIBUS B without going through an arbitration cycle. | The RH11 contains connectors and circuitry for two separate UNIBUSes; the second UNIBUS is primarily used on systems with [[multi-port memory]], such as the [[PDP-11/45]]. If no [[Central Processing Unit|CPU]] is connected to UNIBUS B, an M9300 terminator at the start of the bus can be configured to do [[Non-Processor Request|NPR]] grants. A jumper allows the RH11 to do block transfers on UNIBUS B without going through an arbitration cycle. | ||
Revision as of 21:29, 28 October 2017
The RH11 MASSBUS controller allowed the interconnection of MASSBUS devices such as the RP04 to systems with a UNIBUS, primarily PDP-11's.
The RH11 has the capability to operate in 18-bit mode; in this mode (used in the UC15 UNICHANNEL-15 on the PDP-15), the PA and PB UNIBUS lines are used for data bits 16 and 17.
Registers
The RH11 contains 4 registers, plus a share of a fifth; they are
- RHCS1 - Control and Status 1 (shared)
- RHWC - Word Count
- RHBA - Bus Address
- RHCS2 - Control and Status 2
- RHDB - Data Buffer (for maintenance)
As is standard for the MASSBUS, all the other device registers are in the device.
Hardware
The RH11 consisted of a double system unit backplane into which plugged a number of cards:
Two of them hex-sized:
- M7294 - DBC - Data Buffer and Control
- M7295 - BCT - Bus Control
Two dual-sized cards containing controller logic:
- M7296 - CSR - Control and Status
- M7297 - PAC - Parity Generation and Checking
Three dual-height M5904 MASSBUS transceiver modules.
Optionally one or two (see below) single-height cards:
- M688 - UNIBUS Power Fail Driver
The RH11 backplane also contained three SPC slots in otherwise-unused slots.
Second UNIBUS
The RH11 contains connectors and circuitry for two separate UNIBUSes; the second UNIBUS is primarily used on systems with multi-port memory, such as the PDP-11/45. If no CPU is connected to UNIBUS B, an M9300 terminator at the start of the bus can be configured to do NPR grants. A jumper allows the RH11 to do block transfers on UNIBUS B without going through an arbitration cycle.
