RX11 floppy disk controller - Revision history

Jnc: /* External links */ +Manuals

2022-11-06T12:50:21Z

‎External links: +Manuals

Jnc: Better naming system, links, avoid redir

2020-10-29T15:38:49Z

Better naming system, links, avoid redir

Jnc: +cat

2018-09-04T00:56:46Z

+cat

Jnc: Add remaining error codes

2018-03-27T21:46:58Z

Add remaining error codes

Jnc: /* Error and Status (RXES) */ Add Error reg

2018-03-27T21:43:10Z

‎Error and Status (RXES): Add Error reg

Jnc: /* 777170: Command and Status Register (RXCS) */ RXV11 lossage

2018-03-27T21:27:31Z

‎777170: Command and Status Register (RXCS): RXV11 lossage

Jnc: Mostly complete

2018-03-27T02:27:35Z

Mostly complete

New page

The '''RX11''' and '''RXV11''' are controllers for the [[RX0x floppy drive|RX01]] [[diskette|floppy disk]] [[disk|drives]] for the [[UNIBUS]] and [[QBUS]].

They have an identical programming interface; both use [[programmed I/O]]. The controller contains a buffer, which is filled or emptied under program control.

==Device registers==

{| border=1
! Register !! Abbreviation !! Address
|-
|Command and Status Register || RXCS || 777170
|-
|Data Buffer Register || RxDB || 777172
|}

===777170: Command and Status Register (RXCS)===
{{16bit-header}}
| Error || Initialize || colspan=6 | Unused || Transfer Request || Interrupt Enable || Done || Unit Select || colspan=3 | Function || Go
{{16bit-bitout}}

The function codes are:
{| class="wikitable"
! Code !! Function
|-
| 0 || Fill Buffer
|-
| 1 || Empty Buffer
|-
| 2 || Write Sector
|-
| 3 || Read Sector
|-
| 4 || Not used
|-
| 5 || Read Status
|-
| 6 || Write Deleted Data Sector
|-
| 7 || Read Error Register
|}

===777172: Data Buffer Register (RXDB)===

This register contains one of several 'virtual' registers, depending on the function in progress.

The 'Transfer Request' bit in the RXCS is used to indicate which virtual register is in used at any given time.

====Track Address (RXTA)====
{{16bit-header}}
| colspan=8 | Unused || 0 || colspan=7 | Track
{{16bit-bitout}}

====Sector Address (RXSA)====
{{16bit-header}}
| colspan=8 | Unused || 0 || 0 || 0 || colspan=5 | Sector
{{16bit-bitout}}

====Data Buffer (RXDB)====
{{16bit-header}}
| colspan=8 | Unused || colspan=8 | Data
{{16bit-bitout}}

Note the name clash between this virtual register, and the actual register which contains it.

====Error and Status (RXES)====
{{16bit-header}}
| colspan=8 | Unused || Drive Ready || Deleted Data || colspan=3 | Unused || Initialize Done || Parity Error || CRC Error
{{16bit-bitout}}

@@ Line 111: / Line 111: @@
 | 0210 || All parity errors
 |}
 [[Category: UNIBUS Storage Controllers]]
 [[Category: QBUS Storage Controllers]]

@@ Line 1: / Line 1: @@
-The '''RX11''' and '''RXV11''' are controllers for the [[RX0x floppy drive|RX01]] [[diskette|floppy disk]] [[disk|drives]] for the [[UNIBUS]] and [[QBUS]].
+The '''RX11''' and '''RXV11''' are controllers for the [[RX01/02 floppy drive|RX01]] [[diskette|floppy disk]] [[disk|drives]] for the [[UNIBUS]] and [[QBUS]].
-They have an identical programming interface; both use [[programmed I/O]]. The controller contains a buffer, which is filled or emptied under program control.
+They have an identical programming interface; both use [[programmed I/O]]. The controller contains a [[buffer]], which is filled or emptied under program control.
 ==Device registers==
@@ Line 99: / Line 99: @@
 | 0130 || Preamble found but no I/O mark found within allowable time span
 |-
-| 0140 || [[CRC]] error found on what we thought was a header
+| 0140 || [[Cyclic redundancy check|CRC]] error found on what we thought was a header
 |-
 | 0150 || The header track address of a good header does not compare with the desired track
@@ Line 112: / Line 112: @@
 |}
-[[Category:UNIBUS Storage Controllers]]
+[[Category: UNIBUS Storage Controllers]]
-[[Category:QBUS Storage Controllers]]
+[[Category: QBUS Storage Controllers]]

← Older revision		Revision as of 00:56, 4 September 2018
Line 111:		Line 111:
	\| 0210 \|\| All parity errors		\| 0210 \|\| All parity errors
	\|}		\|}
		+
		+	[[Category:UNIBUS Storage Controllers]]
		+	[[Category:QBUS Storage Controllers]]

@@ Line 45: / Line 45: @@
 This register contains one of several 'virtual' registers, depending on the function in progress.
-The 'Transfer Request' bit in the RXCS is used to indicate which virtual register is in used at any given time.
+The 'Transfer Request' bit in the RXCS is used to indicate which virtual register is in use at any given time.
 ====Track Address (RXTA)====
@@ Line 101: / Line 101: @@
 | 0140 || [[CRC]] error found on what we thought was a header
 |-
-| 150 || The header track address of a good header does not compare with the desired track
+| 0150 || The header track address of a good header does not compare with the desired track
+|-
 |}

← Older revision		Revision as of 21:43, 27 March 2018
Line 68:		Line 68:
	\| colspan=8 \| Unused \|\| Drive Ready \|\| Deleted Data \|\| colspan=3 \| Unused \|\| Initialize Done \|\| Parity Error \|\| CRC Error		\| colspan=8 \| Unused \|\| Drive Ready \|\| Deleted Data \|\| colspan=3 \| Unused \|\| Initialize Done \|\| Parity Error \|\| CRC Error
	{{16bit-bitout}}		{{16bit-bitout}}
		+
		+	====Error (RXER)====
		+	{{16bit-header}}
		+	\| colspan=8 \| Unused \|\| colspan=8 \| Error Code
		+	{{16bit-bitout}}
		+
		+	Error code values:
		+
		+	{\| class="wikitable"
		+	! Value !! Meaning
		+	\|-
		+	\| 0010 \|\| Drive 0 failed to see home on Initialize
		+	\|-
		+	\| 0020 \|\| Drive 1 failed to see home on Initialize
		+	\|-
		+	\| 0030 \|\| Found home when stepping out 10 tracks for INIT
		+	\|-
		+	\| 0040 \|\| Tried to access a track greater than 77
		+	\|-
		+	\| 0050 \|\| Home was found before desired track was reached
		+	\|-
		+	\| 0060 \|\| Self-diagnostic error
		+	\|-
		+	\| 0070 \|\| Desired sector could not be found after looking at 52 headers (2 revolutions)
		+	\|-
		+	\| 0110 \|\| More than 40 μsec and no SEP clock seen
		+	\|-
		+	\| 0120 \|\| A preamble could not be found
		+	\|-
		+	\| 0130 \|\| Preamble found but no I/O mark found within allowable time span
		+	\|-
		+	\| 0140 \|\| [[CRC]] error found on what we thought was a header
		+	\|-
		+	\| 150 \|\| The header track address of a good header does not compare with the desired track
		+
		+	\|}

@@ Line 17: / Line 17: @@
 | Error || Initialize || colspan=6 | Unused || Transfer Request || Interrupt Enable || Done || Unit Select || colspan=3 | Function || Go
 {{16bit-bitout}}
 The function codes are: