Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-06 Thread Eric Smith via cctalk
On Aug 6, 2017 08:20, "dwight via cctalk" wrote: I wonder if they can be reset by just removing the bias magnets. The bias field is needed to maintain the domains in the material. With the Intel bubble parts, if they get erased, you have to use special electronics and

Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-06 Thread dwight via cctalk
ow via cctalk <cctalk@classiccmp.org> Sent: Sunday, August 6, 2017 6:00:15 AM To: cctalk@classiccmp.org Subject: Re: scary warning about bubble memory loop mask, TI 763/765 maint manual the terminals pop up on eBay every so often. I picked up a couple in poor physical condition as do

Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-06 Thread Al Kossow via cctalk
the terminals pop up on eBay every so often. I picked up a couple in poor physical condition as donor machines for the one clean one I've found On 8/5/17 10:56 PM, Eric Smith via cctalk wrote: > With Intel devices, there is a special "seed module" and procedure that can > be used to recover

Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-05 Thread Eric Smith via cctalk
On Aug 5, 2017 19:42, "Chuck Guzis via cctalk" wrote: My recollection is that the track data was printed by Intel. At least mine came that way. Both Intel and TI printed the bad loop map/mask on the device label. Intel also programmed the map into a special "boot loop"

Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-05 Thread Chuck Guzis via cctalk
On 08/05/2017 06:29 PM, Eric Smith via cctalk wrote: > Bubble memory devices typically have many minor loops, not all of > which are usable. TI printed mask data on the label of the bubble > device, identifying the defective loops. When a bubble memory board > is installed or replaced in the

scary warning about bubble memory loop mask, TI 763/765 maint manual

2017-08-05 Thread Eric Smith via cctalk
Al just put the TI Silent 700 Model 763/765 maintenance manual up on Bitsavers. (Thanks Al!) The 763 and 765 are the models using internal bubble memory for between 10,000 and 80,000 characters of local storage. They use either one or two "discrete memory boards", with one 92 Kbit bubble device