Identification of an HP minicomputer

Mike Loewen mloewen at
Mon Aug 12 17:29:31 CDT 2019

    The original M-Series machines were the 2105A and the 2108A (9-slot), which 
sound like what you have.  The early machines didn't say "M-Series" on the 
front panel, and had a different lock than the later models: (my model 2108A)

    Early models had the power switch on the back panel, while later models had 
it behind the front panel.

    It sounds like you might have a later model M. It would be helpful to see a 
closeup of the read card cage (with readable labels), as well as the front 
card cage.  The front card cage is accessed by unlocking the panel and 
removing the cover on the right side over the card cage.  That's where the 
memory boards live.

On Mon, 12 Aug 2019, Guy Sotomayor Jr via cctalk wrote:

> It?s a 9-slot variant that says HP-1000 M-Series on the front panel.  From what I can tell the front panel appears to be the same as any of the other HP-1000 series.
> What I?m trying to figure out is what the actual CPU configuration is without disassembly (which I still need to figure out) so that I can actually examine the boards.
> Thanks.
> TTFN - Guy
>> On Aug 12, 2019, at 2:59 PM, Norman Jaffe via cctalk <cctalk at> wrote:
>> Can you provide a picture of the front panel?
>> 2113 implies a 21MX-E; the nine-slot version is a 2109 while the fourteen-slot would be a 2113.
>> This might help - .
>> From: "cctalk" <cctalk at>
>> To: "cctalk" <cctalk at>
>> Sent: Monday, August 12, 2019 2:52:18 PM
>> Subject: Identification of an HP minicomputer
>> Hi,
>> I have sitting in my pile of stuff an HP minicomputer that I?m trying to identify (at least in terms of exactly what it is and what sort of configuration it might have).
>> As far as I can tell, it?s an HP-1000 M-Series minicomputer (that should hopefully get us *some* details). The ?asset tag? lists the part number as 2113023-108. Looking at the back there?s space for 9 I/O cards (5 are occupied).
>> So my question is which of the several CPUs could this be and how do I tell (for example) what the configuration is (e.g. how much memory, etc).
>> Yes, I have looked on bitsavers, but short of disassembling the box to look at the (at least) 2 boards that are below the I/O slots, I can?t tell what?s there and I?d like to see if there?s a way to determine what this is without resorting to disassembly.
>> Thanks.
>> TTFN - Guy

Mike Loewen				mloewen at
Old Technology

More information about the cctalk mailing list