27 Feb
2013
27 Feb
'13
12:41 a.m.
Am 27.02.2013 00:03, schrieb Guy Sotomayor:
I should point out that (at least from looking at a
couple of the
photos) you're not using Unibus transceivers which are standard on
Omnibus devices. It'll probably work OK on a lightly loaded system
but a PDP-8/e with a double backplane with lots of boards may have
issues.
Ah, really? Of course NOT! The original driver was DEC8881 which is a
relabelled 7439. The 7438 I used has very similar specifications.
As the DEC8881 and the 7438 are not available, I have chosen the 7438.
And it does not make a big difference if the machine is more or less
loaded. The load on the drivers is always the same. It's an open
collector bus.
TTFN - Guy
On Feb 26, 2013, at 3:34 PM, Philipp Hachtmann wrote:
> Am 26.02.2013 19:34, schrieb Adrian Stoness:
>> how much?????????
> Depends on interest/lot size. After 3 hours now the price is at
> approx. EUR 250/piece without VAT - falling with growing number of
> boards. But it should still become cheaper....
>
>
>
>>
>> On Tue, Feb 26, 2013 at 12:31 PM, Philipp
>> Hachtmann<hachti at hachti.de>wrote:
>>
>>> Hi folks,
>>>
>>> I'd like to introduce my newly designed Omnibus-USB interface.
>>> I designed a quite well working prototype of something that
>>> looks like a KL8E for the PDP8 and like a serial port on the PC
>>> - but is none of both :-)
>>>
>>> It ist not meant as a console terminal replacement (which it
>>> could be used as) but as an alternative IO device used to dump
>>> (archive!) and restore mass storage media. To the people who
>>> don't know the problems of having MASSES of disks and tapes to
>>> dump: Please don't flame.
>>>
>>> Pictures and some more information can be found on my website:
>>>
http://pdp8.hachti.de?gallery/**omnibus_usb<http://pdp8.hachti.de?galler…
>>>
>>>
>>>
My intention is to design an improved (probably full height) version
and
> do a little production run. As I'm currently
out of work,
> selling those boards could help a bit. I can do it only if I
> get enough preorders. So I ask everybody with serious interest
> to tell me how many boards he wants and how much he could
> spend. Based on that feedback I'll decide if I can do it and
> fix a price. It won't be cheap - but very helpful and cool!
>
> I'd really like to make some more. It would be great if there's
> enough interest to do it.
>
> If you have any suggestions, let me know!
>
>
> Kind regards,
>
> Philipp :-)
>
> --
>
>
> Dipl.-Inf. (FH) Philipp Hachtmann Buchdruck, Bleisatz,
> Spezialit?ten
>
> Alemannstr. 21, D-30165 Hannover Tel. 0511/3522222, Mobil
> 0171/2632239 Fax. 0511/3500439 hachti at hachti.de
> www.tiegeldruck.de
>
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>