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I'm interested in details of the Equity 1e such as a BIOS dump and doing comparisons to a Model 30 (I've got a V30-8MHz in my main unit) - sending my information in a DM.

...or Gotek...

There is also this that adapts the PS/2 34-pin drives to a clone diskette drive: https://www.ebay.com/itm/304382610986

As far as I know, Peter Wendt would be fine with use of the images he made, as long as he is duly credited...

The Dallas module is *next to* a BIOS chip (that's a PS/2 Model 55SX I had right at hand here) - 'Pin 16' (which isn't present, just as a position on the DS1287x)) is the negative battery lead, and 'Pin 20' (also not present) is the positive battery terminal. I use a Dremel to groove a vertical...

Peter Wendt (an IBM engineer in Germany) was the first instance I saw online, but that was from me being aware of him on the comp.sys.ibm.ps2.hardware newsgroup.

Tight on that ISA slot - but the other side (close to the IDE headers) is the side you need access to. I put grooves above the internal battery connections (which don't extend to the motherboard PCB, as you discovered. Ideally, you want to disconnect the internal battery (I Dremel in to sever...

For the 'POST card' mentioned above, there is an easier option: A parallel port POST code reader. That is going to help to know whether the planar itself is functioning at some level. There's a link to an unaffiliated eBay listing in the video description:

That should have been "...and 314Mb."

The controller boards (1987-1989) on the WDL-330R (30Mb, using the "PASCAL4" PCB), WD-387[T] (60Mb), and WD-3158 (120Mb) DBA-ESDI drives all use an 80C31 microcontroller just like the Model 60/80 ESDI adapter. These are the DBA-ESDI drives that have the microcode version sequence ' 32 02 00 xx'...

There is the 10-pin header close to the MPU on all (including the WD-336R), but I don't know what communication / programming / preparation it would do from an external device. If the drive parameters can't be read, the drive also fails (I had one drive with 'stiction' that now spins up, but...

On later DBA-ESDI drives, I see an Intel 80C196KB microcontroller - and I will start doing photos of the controller PCB. All of the IBM drives, with the exception of the WD-336R (which is listed as an 'ST506-"like"' with 'Type 33' drive parameters in documentation) are 'ESDI-"like". The DBA-ESDI...

Kingston kept the 'GAM' identifier just like on the "SX Now!" when they rebranded this module - although it fits other 286 systems, it's made for the PS/2 Model 50 and 60. This is at a point where IBM was releasing the 486SLC2 CPUs for upgrades other than their systems (which was supposed to be...

This is the raw data from the IBM ESDI controller (https://www.ardent-tool.com/storage/ESDI.html) on the Model 60 and 80 - which I initially gained versioning by dumping the microcode ROM from the adapter directly. The results here are interesting in that the microcode version is prepared with...

More single-stepping will be needed, but I believe that the '36' in the "Reserved" field is just an ASCII-encoded analog of microcode version '0006' on the IBM ESDI controller - it just seems to match up.

That's inverted from my WD-387 and WD-387T pair that are marked the same way ('C13044' label on the bottom and the same sequence returned from 1C0Bh). I've sampled enough drives now to know your drive PCBs are marked as '1988' - in fact, the oldest I have found with mine that still works, and...

The Model 53SLC2 as pictured has an IDE drive (as the 76i/77i also have) - and there is diskette drive cabling to add a 5-1/4" 1.2Mb drive internally on later models.

Yeah, I thought I would have a good test rig with a Model 53SLC2, but it apparently suppresses slot 4. I'll need to get out a 55LS 486 or Reply 55 system.

The "ESDI Fixed Disk Drive Adapter/A Technical Reference" is for the Model 60 and 80 controller, of course - and was dated in April of 1987, which is the initial PS/2 introduction (the 30, 8550-021, and Model 60 - which had an MFM and ESDI submodels. The Model 80 was released a few months...

There are possible PCB variations, with older versions a darker green, and the microcode as silkscreens rather than small labels on the PCB. My WD-387[T] 60Mb drives vary the most but document the changes well. Here are sections of what I previously recorded (all are "Supplier Code: 933", which...