Trash80toHP_Mini
NIGHT STALKER
In the back when, I spent a lot of time and a bit of the filthy lucre on toys in the attempt to replace the two banks of memory in my IIsi with pairs of 32MB 72-pin SIMMs. I finally found and dug out the box playtoys last night. Documented the more promising stuff today. We'll call this the tale of two SIMMexpanders, a remarkably incompatible SIMMPlus and a trio of true oddballs I've yet to see IRL that make the project ring true.
![Minden_Docs_72-pin-to-30-pin Adapter Info.JPG Minden_Docs_72-pin-to-30-pin Adapter Info.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27493-eb5cfec9b00131a6cde1a34fff129bc2.jpg)
The 72-pin SIMM to 30-pin Socket converters appear to be fairly high grade unobtanium ore. Searching Minden or the Model Numbers didn't find them back in the day or today for that matter. :/
I hit a brick wall with what I thought was the most promising SIMMextender, the ME72472, /When it arrived, I spied a GAL on board and there went that notion . . . at that time. Bolle and Co. have come a long way in cracking GALs over the last few years, so this one may pose no problem.
I fell back on the ME72272, a pair of which would work just great . . . if only they supported 32MB SIMMs. But no, it does no support them, nor does the aforementioned SIMMPlus. For some reason the decoding on the pair supports only, 1 4, 16 and 64MB SIMMs. Dunno, maybe going for a pair of 64MB a a single 128MB SIMM makes more sense? I stayed wedded to the notion of using 32MB SIMMs because someone we know is sitting upon a dragon's hoard of the things.
At any rate, now it's a free for all, no set parameters.
The SIMMextender ME72472 is pure magic according to the specs on the packaging:
![ME724728B-Docs.JPG ME724728B-Docs.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27494-b0fa9251dcecccced2d3029b6056d2fc.jpg)
It uses single OR double sided modules! Is that the same as double banked, composite or whatever? Dunno, my brain's offline ATM, so you tell me. ;-D
![ME724728B-x-Component.JPG ME724728B-x-Component.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27495-28274245fd2328ff0da6469b6e9de1a9.jpg)
![ME724728B-x-Solder.JPG ME724728B-x-Solder.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27496-178e3a637d3d6f9bd19959c3e11d6d58.jpg)
![ME724728B-x-Oblique.JPG ME724728B-x-Oblique.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27497-c5e7ef3ad84be5f9ed8dbf5fa5a4e356.jpg)
ME7227 in all its 32MB hostility:
![ME7227B-C.JPG ME7227B-C.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27498-8aa76c45a0725e71944977d4e09e5852.jpg)
![ME7227B-S.JPG ME7227B-S.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27499-45ddc39319c0f6eb0938b10ffec70e09.jpg)
Pesky SIMMplus:
![SIMMPlus-32MB-Incompatibility.JPG SIMMPlus-32MB-Incompatibility.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27500-a04eed4c4f993e44c50ada4faece3ddb.jpg)
Hey @trag you want I should send you some toys?
In the off chance someone thought I broke down with a case of sanity, I've got another design case in mind if nobody wants to make replacement boards for the pretty clear cases. It too would benefit from a massive reduction in PCB real estate from its highly customized SE/30 logic board. But that's for another story. [}
]
![ME724728B_in_Memory_Slot MemCard_as_Modem_PDS_Slot-01.JPG ME724728B_in_Memory_Slot MemCard_as_Modem_PDS_Slot-01.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27501-829ef047ae3d032e8ae554264b027ac7.jpg)
![ME724728B-in_Memory_Slot MemCard_as_Modem_PDS_Slot-00.JPG ME724728B-in_Memory_Slot MemCard_as_Modem_PDS_Slot-00.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27502-99f966fde675af5acc705bd73bb49f89.jpg)
Portable MemCard is placeholder for tiny PDS card in Modem Slot, a NIC with RJ-45 pointing out the back would be perfect, room for another to the right..
![Minden_Docs_72-pin-to-30-pin Adapter Info.JPG Minden_Docs_72-pin-to-30-pin Adapter Info.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27493-eb5cfec9b00131a6cde1a34fff129bc2.jpg)
The 72-pin SIMM to 30-pin Socket converters appear to be fairly high grade unobtanium ore. Searching Minden or the Model Numbers didn't find them back in the day or today for that matter. :/
I hit a brick wall with what I thought was the most promising SIMMextender, the ME72472, /When it arrived, I spied a GAL on board and there went that notion . . . at that time. Bolle and Co. have come a long way in cracking GALs over the last few years, so this one may pose no problem.
I fell back on the ME72272, a pair of which would work just great . . . if only they supported 32MB SIMMs. But no, it does no support them, nor does the aforementioned SIMMPlus. For some reason the decoding on the pair supports only, 1 4, 16 and 64MB SIMMs. Dunno, maybe going for a pair of 64MB a a single 128MB SIMM makes more sense? I stayed wedded to the notion of using 32MB SIMMs because someone we know is sitting upon a dragon's hoard of the things.
At any rate, now it's a free for all, no set parameters.
The SIMMextender ME72472 is pure magic according to the specs on the packaging:
![ME724728B-Docs.JPG ME724728B-Docs.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27494-b0fa9251dcecccced2d3029b6056d2fc.jpg)
It uses single OR double sided modules! Is that the same as double banked, composite or whatever? Dunno, my brain's offline ATM, so you tell me. ;-D
![ME724728B-x-Component.JPG ME724728B-x-Component.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27495-28274245fd2328ff0da6469b6e9de1a9.jpg)
![ME724728B-x-Solder.JPG ME724728B-x-Solder.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27496-178e3a637d3d6f9bd19959c3e11d6d58.jpg)
![ME724728B-x-Oblique.JPG ME724728B-x-Oblique.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27497-c5e7ef3ad84be5f9ed8dbf5fa5a4e356.jpg)
ME7227 in all its 32MB hostility:
![ME7227B-C.JPG ME7227B-C.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27498-8aa76c45a0725e71944977d4e09e5852.jpg)
![ME7227B-S.JPG ME7227B-S.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27499-45ddc39319c0f6eb0938b10ffec70e09.jpg)
Pesky SIMMplus:
![SIMMPlus-32MB-Incompatibility.JPG SIMMPlus-32MB-Incompatibility.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27500-a04eed4c4f993e44c50ada4faece3ddb.jpg)
Hey @trag you want I should send you some toys?
In the off chance someone thought I broke down with a case of sanity, I've got another design case in mind if nobody wants to make replacement boards for the pretty clear cases. It too would benefit from a massive reduction in PCB real estate from its highly customized SE/30 logic board. But that's for another story. [}
![ME724728B_in_Memory_Slot MemCard_as_Modem_PDS_Slot-01.JPG ME724728B_in_Memory_Slot MemCard_as_Modem_PDS_Slot-01.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27501-829ef047ae3d032e8ae554264b027ac7.jpg)
![ME724728B-in_Memory_Slot MemCard_as_Modem_PDS_Slot-00.JPG ME724728B-in_Memory_Slot MemCard_as_Modem_PDS_Slot-00.JPG](https://forumbucket.us-southeast-1.linodeobjects.com/data/attachments/27/27502-99f966fde675af5acc705bd73bb49f89.jpg)
Portable MemCard is placeholder for tiny PDS card in Modem Slot, a NIC with RJ-45 pointing out the back would be perfect, room for another to the right..
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