On 2022-Mar-31, at 8:05 PM, Anders Nelson via cctech wrote:
> Hey all, found this on eBay:
>
> https://www.ebay.com/itm/Corning-Glass-memory-/125087612899
>
> I can't find any info on it - was it some kind of delay-line or magnetic
> laminate stack?
>
> Interesting!
Very interesting - there
On 2022-Jan-06, at 12:19 AM, Joshua Rice via cctech wrote:
> Not cost effective at nearly $10,000! I understand they're very rare, given
> they were only used for a few years in industry and they're clocking on 3/4
> of a century old, but even then, that seems an order of magnitude or two off
>
On 2021-Jul-20, at 4:04 PM, Jules Richardson via cctech wrote:
> On 7/20/21 12:13 PM, pspan via cctech wrote:
>> I worked at a company called DMA located in Amery Wisconsin during the 80's
>> and 90's that did do core mat repair. Yes, the gal that did the work used a
>> scope. She replaced cores
On 2021-Jun-20, at 7:38 PM, ben via cctech wrote:
> On 2021-06-20 8:13 p.m., Toby Thain via cctech wrote:
>
>> Tried the Shunting Yard algorithm? But watch out, it was invented by a
>> quiche eater...
>
> The problem needs backtracking to generate correct code. Stack or
> muilti-register
On 2021-Feb-23, at 1:45 PM, Frank Tuccio via cctech wrote:
> On 02/22/2021 01:31 PM, Brad H via cctalk wrote:
>>
>> A longshot I'm sure - but I am wondering if anyone familiar with MSI
> (Midwest Scentific - SS50 bus system) would happen to have a copy of the
> software for their 1702A EPROM
On 2020-Jul-28, at 6:40 PM, Jay Jaeger via cctech wrote:
> On 7/28/2020 1:43 PM, Brent Hilpert via cctech wrote:
>>
>> Per the OP's machine, the early HP21xx machines were based on CTµL, for
>> which the main supply is +4.5V.
>> DTL and TTL chips in these machi
On 2019-Oct-10, at 5:33 AM, Wouter de Waal via cctech wrote:
>> Very likely a semi custom or custom memory device, due to the prefix.
>
> Armed with that and the fact that pin 1 connects to the leadframe I figured
> maybe it's something like the 6830 Mikbug prom -- 0V on 1, 5V on 12, data on
>
On 2019-Sep-02, at 9:35 AM, Alan Perry via cctech wrote:
> Can anyone here provide a pointer to info on testing vintage power supplies?
> Search results on the web may eventually lead to the kind of info that I am
> looking for, but I have to get through too many pages of modern PC power
>
On 2019-Mar-12, at 1:21 AM, shad via cctech wrote:
> I always have been amazed by the complexity and peculiarity of
> fixed/removable hybrid discs like DEC RC25 and CDC 9457.
> Looking at some specifications found on the web, these drives look quite
> similar each other, even if these are
On 2019-Mar-11, at 2:37 PM, allison via cctech wrote:
> On 03/11/2019 02:11 PM, Jay Jaeger via cctech wrote:
>> I have several PDP-11's in my collection (among other things), and not
>> enough PC05 tape readers (or enough room) to go around. But most if not
>> all of my machines have M7810 PC11
On 2018-Sep-23, at 7:46 AM, Michael Thompson via cctech wrote:
> Visitors to the RICM like to play SPACEWAR! in the PDP-12. Unfortunately
> using the console switches is uncomfortable, not intuitive, and is tough on
> the switches. We would like to recreate the switch boxes used on the PDP-1
> to
On 2017-Aug-07, at 3:43 PM, James Hamilton via cctech wrote:
> Hello all,
>
> Is there any good advice on avoiding shorts while testing a male DIN plug
> with a multimeter? I'm trying to test my C64 power supply, but I'm very
> nervous about accidentally shorting it in the process.
>
a few
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