KA650 VAX memory error

2019-03-02 Thread Joseph Zatarski via cctalk
On Sat, Mar 2, 2019 at 3:16 PM Glen Slick via cctalk wrote: On Sat, Mar 2, 2019 at 12:02 PM Joseph Zatarski via cctalk http://www.classiccmp.org/mailman/listinfo/cctalk>> wrote: //>>/On a somewhat related note, I don't suppose anybody knows or has />>/documentation on the pinout of the C/D

Re: KA650 VAX memory error

2019-03-02 Thread Glen Slick via cctalk
On Sat, Mar 2, 2019 at 12:02 PM Joseph Zatarski via cctalk wrote: > > On a somewhat related note, I don't suppose anybody knows or has > documentation on the pinout of the C/D interconnect on these RAM boards? > The pinout for the ribbon cable is in the manual, but the C/D > interconnect doesn't

KA650 VAX memory error

2019-03-02 Thread Joseph Zatarski via cctalk
Hello Everyone, I've got a KA650 with a MS650-AA 8MB memory module. When we initially started messing with this VAX, it was giving a memory error. We were able to track down first the bad bank, and later the individual bad ZIP RAMs with the help of my logic analyzer. For now, I kludged an