Hi All,
All my 8" SSDD /SSSDdisks are non formatted, which was the reason for my initial troubles. Nevertheless, my IBM System /23 (Type 5324) can format disks in three different formats:

_1. IBM System /23 Format_
512 Bytes per Sector
Possible Disk: SSSD, SSDD, DSDD

_2. Standard Format_
128 Bytes per Sector
Possible Disk: SSSD, SSDD

_3. H- Format_
258 Bytes per Sector
Possible Disk: DSDD

_So option 2_ was the right one, also when nothing in the docs point to the IBM 3740 format. After booting the System/23 with the inserted maintenance Disk VOL002 the formatter program can be started with the following command: link prepare


By now I have 20 RX02 Disks formatted, and was also able to create a bootable RT11 Disk via my running RT11 installation on my RC25.
It is RT-11SJ (S) V04.00I ...
>>>
.FORMAT DY1:
DY1:/FORMAT-Are you sure?Y
?FORMAT-I-Formatting complete
<<<
>>>
.INIT/BAD DY1:
DY1:/Initialize; Are you sure? Y
?DUP-I-No bad blocks detected DY1:
<<<

Next step would be to install RT11 on my SCSI Disk, which is presented through a Dilog SU726A as MSCP Device 0 (Address 160340 (will be 1760340 on my PDP-11/84)) to the system. Disk is an DEC RZ22 and was also formatted and mapped, through the Dilog "BIOS" (Jumper J14 in to boot Maintenance Address ... and @175000g followed by FT) Now it looks like I need the SU726A manual, as I have no clue as which device RT11 should recognize the Dilog, I assume DU0: but RT11 doesn't load the Device.


*SHOW DEV*

Device      Status       Vector
-------------------------------
  US      Not installed  410
  DL      Not installed  160
  DU      Not installed  154
  RK      Not installed  220
  DY      Resident       264
  DX      Not installed  264
  LP      146676         200 204
  SC      143332         000
  HC      Not installed  330 334
  BS      Not installed  300 304
  VW      Not installed  270 274
  NL      Installed      000
  LS      Installed      200 204
  MS      Not installed  224
  MM      Not installed  224
*
**.DIR*

SWAP  .SYS    25  26-Nov-91      RT11SJ.SYS    65  26-Nov-91
US    .SYS     7  26-Nov-91      TT    .SYS     2  26-Nov-91
DL    .SYS     4  26-Nov-91      DU    .SYS     4  26-Nov-91
RK    .SYS     3  26-Nov-91      DY    .SYS     4  26-Nov-91
DX    .SYS     3  26-Nov-91      LP    .SYS     2  26-Nov-91
SC    .SYS     5  26-Nov-91      HC    .SYS     5  26-Nov-91
BS    .SYS     3  26-Nov-91      VW    .SYS     2  26-Nov-91
NL    .SYS     2  26-Nov-91      LS    .SYS     2  26-Nov-91
SCMEV .SYS     5  26-Nov-91      SCVS11.SYS     4  26-Nov-91
SCEVA .SYS     4  26-Nov-91      LPMEV .SYS     2  26-Nov-91
LPLXY .SYS     2  26-Nov-91      LPSID .SYS     2  26-Nov-91
LPEVA .SYS     2  26-Nov-91      MS    .SYS    10  26-Nov-91
MM    .SYS     9  26-Nov-91      HC7221.SYS     4  26-Nov-91
HC7220.SYS     5  26-Nov-91      HC722T.SYS     5  26-Nov-91
US460 .SYS     7  26-Nov-91      US410 .SYS     7  26-Nov-91
HC7580.SYS     5  26-Nov-91      HC7550.SYS     5  26-Nov-91
HC7475.SYS     5  26-Nov-91      HC722C.SYS     5  26-Nov-91
SCMPR .SYS     5  26-Nov-91      CHKPNT.SYS   412  09-Aug-94
STARTS.COM     1  26-Nov-91      PIP   .SAV    23  26-Nov-91
DIR   .SAV    17  26-Nov-91      DUP   .SAV    41  26-Nov-91
RESORC.SAV    15  26-Nov-91      FORMAT.SAV    19  26-Nov-91
 42 Files, 759 Blocks
 215 Free blocks


Any Hint how I get RT11 load the correct device so that I can format and init the SCSI Disk? Is maybe Someone here with an Manual of the Dilog? A SU723 could be also helpful, ... .

Many Greetings
Ulrich

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