514:
1359:
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25:
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222:
The last track of an RL01 and RL02 cartridge contains a table which lists all of the bad sectors on the cartridge. This track also contains the cartridges serial number.) The drive does not contain any logic for handling bad sectors - this must be performed by the operating system. Hence, one could
157:
cartridges, but have servo tracking data pre-encoded onto the cartridge. This reduces the need for strict head alignment, allowing cartridges to be used in several drives (although there was no backwards compatibility between RL02 and RL01 cartridges, despite similar appearance). However, this
144:
microcomputers. The RL01 and RL02 drives stored approximate 5MB and 10MB respectively, utilizing a removable data cartridge. The drives are typically mounted in a standard 19" rack and weigh 34 kg. Up to four RL02 or RL01 drives may be used, in any combination, from a single controller.
179:
consisting of three words. The first word identifies whether the sector is on the upper or lower side of the platter, followed by the track number (1 to 256 or 1 to 512) and finally the sector number (1 to 40). The second word is all zeros. The third word contains a
317:
This line will be asserted by the selected drive when the head is centred over the selected track, indicating that the drive is ready to receive commands from the controller. This temporarily goes low when a drive command word has been shifted.
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These two lines are used to select the drive (0-3). As there are only four possible combinations, at least one of the four drives is always selected. Only the selected drive will output data on the Drive Ready through to Status lines.
270:
Only when this line is asserted will the writing circuitry be enabled within the drive. If this line is asserted while a sector pulse occurs, the drive will raise a Write Gate Error and the drive will no longer accept any commands.
308:
This line remains asserted at all times that the controller is active. If the computer or controller experience a power failure, this line will fall low, resulting in the drive unloading the heads and spinning down the platter.
291:
The system clock shifts data through the Drive
Command line and also provides a reference for the disk servo motor. The drive will not spin up without these clock pulses. The clock pulses must be 4.1 MHz +/- 0.1%.
158:
prevents on-site low level formatting of cartridges. The drives have logic to prevent this servo data from being overwritten. RL01 cartridges have 256 tracks, and RL02 cartridges have 512 tracks.
145:
Typically an RL11 in the case of a Unibus PDP-11 and an RLV11 or RLV12 in the case of a Q-bus PDP-11. On the PDP-8/a the controller is an RL8A which consists of an M8433 Hex wide
Omnibus card.
461:
166:
On both RL01 and RL02 cartridges, each track is divided into 40 sectors of equal length. Each sector is divided into six fields, defined as follows (where each word is 16 bits).)
231:
Access to and from an RL drive is done serially, via a 40 pin cable running from the controller inside the computer to the drive. These lines are described in the table below.
215:
The header and data is preceded by two servo bursts (S1 and S2) which are prerecorded onto the data cartridge during manufacture. Data is encoded on the disk using
454:
420:
1382:
1372:
447:
397:
337:
This is a 625 microsecond pulse which is asserted high 40 times per disc revolution. This signal is generated from by the sector transducer.
1070:
502:
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of one word consisting only of zeros. This field separates the header and data fields, enabling for mechanical tolerances between drives.
1144:
154:
1149:
1090:
1037:
1403:
108:
1284:
904:
46:
1174:
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429:
406:
345:
280:
216:
133:
1264:
971:
522:
1322:
1269:
1052:
1014:
859:
1299:
1085:
89:
35:
1333:
61:
996:
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encoded data is transferred over this line whenever the drive is selected and the head is locked onto a track.
513:
1317:
203:
181:
68:
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When the Write Gate line is asserted, data may be transferred on this line. This data should be encoded in
1289:
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597:
1408:
1362:
529:
42:
75:
1279:
1047:
951:
329:
This clock the delayed system clock and is only enabled during a transfer of the drive status word.
219:, where a one bit will result in a magnetic flux reversal on the magnetic coating of the cartridge.
1139:
884:
538:
1006:
57:
1116:
699:
364:
The drive status word is transferred in serial using this line, clocked by the Status Clock.
1154:
839:
1413:
1062:
490:
1159:
1026:
1020:
580:
1397:
1204:
129:
1199:
1095:
1042:
941:
300:
This line is used to transfer the drive command word, shifted by the system clock.
223:
potentially erase this table if the operating system does not prevent against it.
196:
consists of three words of 47 zeros, followed by a single synchronization one bit.
173:
consists of three words of 47 zeros, followed by a single one for synchronization.
82:
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24:
1257:
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contains 128 words (a total of 2048 bits), followed by single word (16 bits)
1230:
1134:
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991:
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680:
619:
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1241:
981:
976:
936:
715:
575:
557:
552:
1294:
1179:
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1075:
961:
921:
916:
864:
1327:
1247:
1235:
1100:
931:
926:
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894:
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141:
1344:
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1312:
1304:
1274:
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1080:
986:
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137:
1209:
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721:
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356:
This line is asserted when there has been certain drive errors.
443:
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18:
184:(CRC) of the header. This is checked during a read operation.
432:. December 1979. pp. I/3-1-I/3-6. EK-RL012-TM-PRE.
283:, as the drive does not encode or decode this data.
1218:
1114:
1061:
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838:
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673:
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566:
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477:
422:
RL01/RL02 DISK DRIVE Technical Manual (Preliminary)
49:. Unsourced material may be challenged and removed.
153:The RL01 and RL02 data cartridges are based on
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392:
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382:
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8:
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109:Learn how and when to remove this message
233:
376:
399:RL01/RL02 Disk Subsystem User's Guide
321:From the RL drive to the controller.
257:From the controller to the RL drive.
16:Cartidge-based hard disk drive format
7:
1378:
1071:Digital Storage Systems Interconnect
47:adding citations to reliable sources
1145:Dynamically Redefined Character Set
1091:Synchronous Backplane Interconnect
14:
1377:
1368:
1367:
1358:
1357:
409:. October 1980. EK-RL012-UG-004.
23:
1285:Maintenance Operations Protocol
34:needs additional citations for
1:
1175:Mass Storage Control Protocol
471:Digital Equipment Corporation
346:Modified Frequency Modulation
281:Modified Frequency Modulation
217:Modified Frequency Modulation
134:Digital Equipment Corporation
1265:Digital Federal Credit Union
487:(founder and CEO, 1957–1992)
1309:Sequence and Batch Language
1270:Dynamic debugging technique
1430:
1300:Record Management Services
1086:Standard Disk Interconnect
1353:
1334:The Ultimate Entrepreneur
510:
320:
256:
252:
1404:Computer storage devices
997:DIGITAL Command Language
1323:Systems Research Center
1318:System Reference Manual
204:cyclic redundancy check
182:cyclic redundancy check
132:drives manufactured by
128:drives are moving head
1290:On-line Debugging Tool
211:contains 16 zero bits.
188:Header Postamble (PO1)
171:Header Preamble (PR1)
1280:Local Area Transport
1038:National Replacement
209:Data Postamble (PO2)
43:improve this article
1140:Digital Linear Tape
499:(VP of engineering)
235:
194:Data Preamble (PR2)
1363:Computers template
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1155:Flip-Chip module
1048:Special Graphics
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505:(CEO, 1992–1998)
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149:Cartridge format
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1017:(Multinational)
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523:Instruction set
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491:Harlan Anderson
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262:Drive Select 1
250:Drive Select 0
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1219:Related topics
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1027:Code page 1288
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1021:Code page 1287
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1007:Character sets
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581:MicroVAX 78032
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1063:Bus standards
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525:architectures
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504:
503:Robert Palmer
501:
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334:Sector Pulse
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328:
326:Status Clock
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288:System Clock
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130:magnetic disk
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63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1409:DEC hardware
1332:
1240:
1200:Star coupler
1194:
1096:TURBOchannel
942:Digital UNIX
493:(co-founder)
421:
415:
398:
353:Drive Error
314:Drive Ready
242:Description
230:
221:
214:
208:
199:
193:
187:
176:
170:
165:
152:
125:
121:
120:
105:
99:January 2022
96:
86:
79:
72:
65:
53:
41:Please help
36:verification
33:
952:Programming
665:Alpha 21464
660:Alpha 21364
655:Alpha 21264
645:Alpha 21164
628:Alpha 21064
497:Gordon Bell
305:Power Fail
276:Write Data
267:Write Gate
162:Data format
1398:Categories
1258:HP-Interex
681:MicroPRISM
530:processors
478:Key people
371:References
342:Read Data
245:Direction
239:Line Name
69:newspapers
1231:AltaVista
1135:DECwriter
1106:VAXBI bus
1053:Technical
1029:(Turkish)
992:VAX MACRO
954:languages
840:Operating
722:VT50/VT52
702:terminals
686:StrongARM
485:Ken Olsen
227:Interface
1373:Category
1242:CPU Wars
1160:Gold key
1117:hardware
1043:RADIX 50
982:MACRO-11
977:MACRO-10
700:Computer
155:IBM 5440
136:for the
1383:Commons
1295:PALcode
1180:PALcode
1150:Firefly
1130:DECtape
1125:DECtalk
1076:Massbus
1023:(Greek)
962:BASIC-8
922:VAX/VMS
917:TOPS-20
865:TOPS-10
842:systems
649:21164PC
361:Status
177:Header,
83:scholar
1414:PDP-11
1328:TD/SMP
1248:DECnet
1236:Compaq
1115:Other
1101:Unibus
1033:Hebrew
932:Ultrix
927:VAXELN
912:DSM-11
900:RSX-11
895:RSTS/E
885:DOS-11
870:RSX-15
855:4K DMS
850:DECsys
826:(1994)
820:(1993)
814:(1990)
812:VT1000
808:(1990)
792:(1987)
776:(1983)
740:(1978)
724:(1975)
718:(1972)
712:(1970)
603:Mariah
546:LSI-11
539:PDP-11
142:PDP-11
85:
78:
71:
64:
58:"RL02"
56:
1345:WPS-8
1340:VT640
1313:Sixel
1305:ReGIS
1275:FX!32
1253:DECUS
1226:AdvFS
1170:LK421
1165:LK201
1081:Q-Bus
987:MUMPS
972:FOCAL
967:DIBOL
890:RT-11
875:TSS/8
830:VT525
824:VT520
818:VT510
806:VT420
801:VT340
796:VT330
790:VT320
785:VT241
780:VT240
774:VT220
769:VT180
764:VT131
759:VT105
754:VT103
749:VT102
744:VT101
738:VT100
674:Other
638:21068
633:21066
620:Alpha
598:Rigel
426:(PDF)
403:(PDF)
138:PDP-8
90:JSTOR
76:books
1210:TU81
1195:RL02
1190:RK05
1185:RA90
937:MICA
880:OS/8
733:VT62
728:VT55
716:GT40
710:VT05
610:NVAX
586:CVAX
576:V-11
558:J-11
553:T-11
549:F-11
200:Data
140:and
126:RL02
124:and
122:RL01
62:news
905:IAS
860:COS
591:SOC
568:VAX
430:DEC
407:DEC
45:by
1400::
428:.
405:.
379:^
651:)
647:(
527:,
463:e
456:t
449:v
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
