> On Apr 1, 2022, at 3:38 PM, Joshua Rice <ric...@btinternet.com> wrote:
>
>
>
>> On Apr 1, 2022, at 7:51 PM, Paul Koning via cctalk <cctalk@classiccmp.org>
>> wrote:
>>
>> Neat looking stuff. It doesn't look like core rope memory in the sense of
>> the AGC ROM, nor in the sense of the Electrologica X1. It looks more like
>> the transformer memory used in Wang calculators that you documented in your
>> core ROM paper.
>>
>> paul
>>
>
> I second the Transformer ROM theory. I guess the transformers are the epoxied
> modules on the top half of the board, with some weird magnetic/inductance
> wizardry at the bottom doing the adressing. You may find it’s a hybrid of
> core rope and transformer ROM for super dense ROMs. I’m no expert at the
> nuances of this field though.
>
> Reminds me a bit of my Wagenr Computer transformer ROM:
> https://www.reddit.com/r/vintagecomputing/comments/m3pe29/a_very_photogenic_rom_board_from_an_early_70s/
>
Nice. Is that actually a transformer ROM, or a square loop type core rope ROM?
The physical appearance supports both conclusions. To be sure you'd have to
analyze the driving circuitry, or check the properties of the cores used in it.
paul
