13 Feb
2019
13 Feb
'19
7:39 p.m.
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?
-- Chris
14 Feb
14 Feb
11:50 a.m.
The empty 40-pin should be an Intel 7224 if the card is using 7114 bubble
modules, and the 7220 if it's the 7110 bubble modules.
For the card in question, I'm pretty sure it's the 7114 module.
The IC is required as that's the bubble memory controller itself.
On Wed, Feb 13, 2019 at 4:39 PM Chris Hanson via cctalk <
cctalk at classiccmp.org> 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?
-- Chris
7:25 p.m.
On Thu, Feb 14, 2019 at 2:53 PM Josh via cctalk <cctalk at classiccmp.org>
wrote:
The empty 40-pin should be an Intel 7224 if the card
is using 7114 bubble
modules, and the 7220 if it's the 7110 bubble modules.
Although there is a datasheet for the 7224, I don't think it went into
volume production. It looks like they made the 7225 instead. I'm not sure
what, if any, differences there are between the 7224 and 7225; it might
just be a part number change.
For the 7220 used with Intel 1Mbit bubble devices (7110), one has to be
sure that it's an _Intel_ 7220, usually D7220-1. The NEC ?PD7220 is a
graphics chip (equivalent to Intel 82720).
15 Feb
15 Feb
4:57 p.m.
New subject: Paging Eric Smith, or current owner of DECSYSTEM-2065 from RCS/RI
No luck with direct email (to either spacewar or brouhaha) or LinkedIn PM.
I've been cleaning out my old garage and in the process, discovered some
sheet metal (a pair of back doors for a double-wide cab, and one of the
four white separator shims that goes between the three cabs) which belonged
to the KL10 system that I donated to RCS/RI eons ago (and which they
apparently sold rather than keep). Even though it's just cosmetic, and
minor at that, I'd love to reunite this stuff with the rest of the system,
wherever it wound up. I don't have the heart to scrap it (which is how I
ended up with an 1100 sq ft garage full of antique computers in the first
place, obviously).
John Wilson
Monson, MA
14 Feb
14 Feb
12:36 p.m.
On Wed, Feb 13, 2019 at 5:39 PM Chris Hanson via cctalk <
cctalk at classiccmp.org> 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).
2061
days inactive
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4 comments
4 participants
participants (4)
-
cmhanson＠eschatologist.net -
saburwulf＠gmail.com -
spacewar＠gmail.com -
wilson＠dbit.com