Intel PC-BUBBLE Card documentation?

Eric Smith spacewar at
Thu Feb 14 11:36:48 CST 2019

On Wed, Feb 13, 2019 at 5:39 PM Chris Hanson via cctalk <
cctalk at> wrote:

> Does anyone have documentation stashed away for the Intel PC-BUBBLE Card?
> The PC-BUBBLE is an 8-bit ISA card that Intel produced for prototyping
> bubble memory applications in the mid-1980s, the ROM on mine is v3.0 and
> says it’s copyright 1986.
> I don’t want to insert this into a system until I’m sure all the (many)
> jumpers are configured reasonably, and I’m sure that the empty 40-pin
> socket at U5 isn’t something that’s critical to its operation…

Is there a 40-pin chip elsewhere? There should be one 40-pin chip, which is
the Bubble Memory Controller (BMC). That's a D7220 for 1Mbit bubble devices
(7110), or a D7225 for 4Mbit bubble devices (7114).

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