tips:vax:microvax3100
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tips:vax:microvax3100 [2010/01/19 16:20] mattieu |
tips:vax:microvax3100 [2010/01/19 16:43] mattieu |
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| - | MicroVAX 3100 M20e | + | ====== |
| + | ===== Hardware summary ===== | ||
| < | < | ||
| Line 9: | Line 9: | ||
| Bus: SCSI | Bus: SCSI | ||
| - | Memory on CPU: 4MB | + | Memory on CPU: 4 MB |
| - | Max. Memory: 32MB (obtained by piggy-backing MS42-CA and MS42_BA together) | + | Max. Memory: 32 MB (obtained by piggy-backing MS42-CA and MS42_BA together) |
| Mem. Slots: 1 | Mem. Slots: 1 | ||
| - | 4MB part: | + | 4 MB part: |
| - | 8MB part: | + | 8 MB part: |
| - | 12MB part: | + | 12 MB part: |
| - | 16MB part: | + | 16 MB part: |
| + | |||
| + | Max. Disk Size: 1.073 GB | ||
| Enclosure: | Enclosure: | ||
| //Notes: MicroVAX 3100 M10e used same hardware in a smaller BA42-A box. On board NCR-5380 SCSI-1, where video is on VAXstation 3100 M38. Can switch EPROM to get VAXserver 3100 KA41-E. Ethernet ' | //Notes: MicroVAX 3100 M10e used same hardware in a smaller BA42-A box. On board NCR-5380 SCSI-1, where video is on VAXstation 3100 M38. Can switch EPROM to get VAXserver 3100 KA41-E. Ethernet ' | ||
| + | |||
| + | ===== What system disk size limit on the MicroVAX and VAXstation 3100? ===== | ||
| + | |||
| + | System disks larger than 1.073 gigabytes (GB)---1fffff hexidecimal blocks -- are not supported on any member of the VAXstation 3100 series and on certain older members of the MicroVAX 3100 series, and are not reliable on these affected systems. (See below to identify the affected systems---the more recent members of the MicroVAX 3100 series systems are NOT affected.) | ||
| + | |||
| + | Various of the SCSI commands used by the boot drivers imbedded in the console PROM on all members of the VAXstation 3100 series use "Group 0" commands, which allow a 21 bit block number field, which allows access to the first 1fffff hexidecimal blocks of a disk. Any disk references past 1fffff will wrap---this wrapping behaviour can be of particular interest when writing a system crashdump file, as this can potentially lead to system disk corruptions should any part of the crashdump file be located beyond 1.073 GB. | ||
| + | |||
| + | More recent systems and console PROMs use "Group 1" SCSI commands, which allow a 32 bit block number field. | ||
| + | |||
| + | There was a similar limitation among the oldest of the MicroVAX 3100 series, but a console boot PROM was phased into production and was made available for field retrofits---this PROM upgrade allows the use of the "Group 1" SCSI commands, and thus larger system disks. There was no similar PROM upgrade for the VAXstation 3100 series. | ||
| + | |||
| + | Systems that are affected by this limit: | ||
| + | |||
| + | * VAXstation 3100 series, all members. No PROM upgrade is available. | ||
| + | * MicroVAX 3100 models 10 and 20. No PROM upgrade is available. | ||
| + | * MicroVAX 3100 models 10e and 20e. Only systems with console VMB versions prior to V6.4 are affected. A PROM upgrade for these specific systems is (or was once) available. | ||
| + | |||
| + | ~~NOTOC~~ | ||
tips/vax/microvax3100.txt · Last modified: 2010/01/20 10:19 by mattieu
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