This Mac Plus is owned by the original owner, which he bought 35 years ago, but was upgraded to a Mac Plus a few years after it was purchased.
* If DynaMac is left as it is, it should be more valuable. The Kanji-ROM card removed during the upgrade is stored by the owner, so it seems that it can be restored by arranging other parts.
This time, I repaired it using ROM-inator because of the symptom of becoming a checkerboard.
This is famous for showing ROM anomalies, but this time I was replaced this genuine Plus ROM with a ROM-inator. I forgot how many of these kits I made... but I made and tested a board for the low profile of Resurrections. This time too, it was completed in about 10 minutes.
I tested it immediately. Of course it worked fine. The logic board replaced the capacitors in two places and added a diode for SCSI bus power.
Of course, in the case of 512K, the RAM size is 512KB, but when it comes to Plus, you can install up to 4MB. Of course, if you buy it second hand, most of them have 4MB installed, which is the maximum memory capacity. Plus is equipped with on-board SCSI, so you can finally use SCSI HD from this model. I think this point also has a high advantage.
This Mac Plus will be the owner's own tribute, so from here we will recap the analog board and repair the floppy drive to complete it.