Next project: 11/24. Does it need memory?--Working-ish!

[Jerry Weiss]

On 10/25/20 8:01 PM, Chris Zach via cctalk wrote:
> .....
> Question: Can an RX02 boot an RX01 floppy formatted single density 
> with the DY: driver? Can it read an RX02 floppy in one drive and an 
> RX01 floppy in the other or do you have to set the switches and use 
> the right controller card (that would be stupid, but sooooo DEC!)
>
> Thanks everyone here and on the Discord for the help Getting there bit 
> by bit.
>
Well done on sorting this out.  As to the RX02 questions....

An RX02 drive in RX02 mode can read either DEC single or double density 
media in either drive.

If the RX01 media has a DY handler (RT11) configured as primary boot, it 
"may" be possible.  It will definitely not work with the DX handler 
configured.   To do this, you also need a different ODT/ROM bootstrap. I 
have pulled one I have in my files and pasted it below. I do not 
remember the source, but looks like someone has tried this before.



    Jerry

RX02 Single Density Bootstrap

Address    Contents
001000    012700
001002    100240
001004    012701
001006    177170
001010    005002
001012    012705
001014    000100
001016    012704
001020    000401
001022    012703
001024    177172
001026    030011
001030    001776
001032    100437
001034    012711
001036    000007
001040    030011
001042    001776
001044    100432
001046    110413
001050    000304
001052    030011
001054    001776
001056    110413
001060    000304
001062    030011
001064    001776
001066    100421
001070    012711
001072    000003
001074    030011
001076    001776
001100    100414
001102    010513
001104    030011
001106    001776
001110    100410
001112    010213
001114    060502
001116    060502
001120    122424
001122    120427
001124    000007
001126    003735
001130    012700
001132    000000
001134    005007
001136    000000