On 12/6/16 10:05 AM, Toby Thain wrote:
On 2016-12-06 1:34 AM, Eric Smith wrote:
On Mon, Dec 5, 2016 at 6:53 PM, allison wrote:
A bunch of us old digits (former dec engineers) got together and were
talking
about old systems and the thing that stood out is a general dislike for
having
to use th
On 2016-12-06 1:34 AM, Eric Smith wrote:
On Mon, Dec 5, 2016 at 6:53 PM, allison wrote:
A bunch of us old digits (former dec engineers) got together and were
talking
about old systems and the thing that stood out is a general dislike for
having
to use the limited set of bus interface chips whe
On Mon, Dec 5, 2016 at 6:53 PM, allison wrote:
> A bunch of us old digits (former dec engineers) got together and were
> talking
> about old systems and the thing that stood out is a general dislike for
> having
> to use the limited set of bus interface chips when there were newer
> parts. It
>
On 12/05/2016 06:35 PM, Toby Thain wrote:
> On 2016-05-02 9:48 AM, Noel Chiappa wrote:
>> > From: Pete Lancashire
>>
>> > Do you or someone have a list of all the Unibus bus chips ?
>>
>> I have seen the following bus interface chips used on DEC UNIBUS boards:
>>
>> Drivers:
>>
>> 8881 - Sp
On Mon, Dec 5, 2016 at 4:35 PM, Toby Thain wrote:
> Has anyone looked at the TI Signal Switch family for QBus? (hat tip Ian
> Finder)
>
I use those for interfacing 5V TTL-compatible stuff to 3.3V logic.
It doesn't really solve the major Qbus problems. In particular, it doesn't
help with either
On 2016-05-02 9:48 AM, Noel Chiappa wrote:
> From: Pete Lancashire
> Do you or someone have a list of all the Unibus bus chips ?
I have seen the following bus interface chips used on DEC UNIBUS boards:
Drivers:
8881 - Sprague, Signetics - Quad NAND
Receivers:
380 - Signetics - Quad
On 5/2/2016 7:04 AM, Mattis Lind wrote:
The following chips have been used by DEC to interface to the QBUS, and
I have seen many of the above chips (e.g. 8641's) used there too, so I
think chips seen on one bus could be used on the other:
Drivers:
7439 - Various - Quad NAND
Transceivers:
2908
I did a bit of searching in the fall for an 8881 (to fix a busted HALT
instruction on a PDP8a). I concluded the 7439 is a pin-for-pin replacement
- I can't claim all credit for this, it's probably known by a few people
here. My notes say the 8881 will handle 30mA loads. The 7401 will handle
16mA
> The following chips have been used by DEC to interface to the QBUS, and
> I have seen many of the above chips (e.g. 8641's) used there too, so I
> think chips seen on one bus could be used on the other:
>
> Drivers:
>
> 7439 - Various - Quad NAND
>
> Transceivers:
>
> 2908 - AMD - Quad latching t
> From: Pete Lancashire
> Do you or someone have a list of all the Unibus bus chips ?
I have seen the following bus interface chips used on DEC UNIBUS boards:
Drivers:
8881 - Sprague, Signetics - Quad NAND
Receivers:
380 - Signetics - Quad NOR
314 - Signetics - 7-input NOR
8815 - Sign
Do you or someone have a list of all the Unibus bus chips ? I'd like
to put them in my search list
-pete
On Mon, Feb 8, 2016 at 2:10 PM, Guy Sotomayor wrote:
>
>> On Feb 8, 2016, at 2:04 PM, Noel Chiappa wrote:
>>
>>
>>
>>> From: Ethan Dicks
>>
>>> I'm starting to get sorry I sold off my surplu
> On Feb 8, 2016, at 2:04 PM, Noel Chiappa wrote:
>
>
>
>> From: Ethan Dicks
>
>> I'm starting to get sorry I sold off my surplus NS8641s from Software
>> Results 20 years ago. To be fair, I did get over $4 each for them, so at the
>> time, it was a good deal for me (ISTR retail was $7.50 eve
> From: Guy Sotomayor
> The reality is that an SPC board will be more expensive because of the
> gold edge fingers.
Oh, right, forgot about that. Yeah, six of one...
> I was originally thinking that if I do have to split the board up, that
> I'd make them completely independe
> On Feb 8, 2016, at 1:29 PM, Ethan Dicks wrote:
>
> On Mon, Feb 8, 2016 at 4:13 PM, Guy Sotomayor wrote:
>> Anything optional will be in sockets. I’ll be putting the UNIBUS
>> transceivers
>> in sockets because I can’t afford the overage that I’d need to provide to the
>> board house for ass
On Mon, Feb 8, 2016 at 4:13 PM, Guy Sotomayor wrote:
> Anything optional will be in sockets. I’ll be putting the UNIBUS transceivers
> in sockets because I can’t afford the overage that I’d need to provide to the
> board house for assembly.
I'm starting to get sorry I sold off my surplus NS8641s
> On Feb 8, 2016, at 1:08 PM, Ian S. King wrote:
>
>>
>> See above re: gold edge fingers. I was originally thinking that if I do
>> have to
>> split the board up, that I’d make them completely independent. But that
>> has
>> the issue of requiring 2x the number of UNIBUS transceiver parts (wh
> On Feb 8, 2016, at 1:03 PM, Ethan Dicks wrote:
>
> On Mon, Feb 8, 2016 at 3:30 PM, Guy Sotomayor wrote:
>>> On 2/8/16 10:09 AM, Guy Sotomayor wrote:
So, things are moving forward. I also wanted to get folk's opinion on
the need to actually produce
an SPC form factor board. In
On Mon, Feb 8, 2016 at 1:04 PM, Guy Sotomayor wrote:
>
> > On Feb 8, 2016, at 12:43 PM, Noel Chiappa
> wrote:
> >
> >> From: Guy Sotomayor
> >
> >
> >> I also wanted to get folk's opinion on the need to actually produce an
> >> S[P]C form factor board. ... is it OK to have the MEM11 be outside o
> On Feb 8, 2016, at 12:43 PM, Noel Chiappa wrote:
>
>> From: Guy Sotomayor
>
>
>> I also wanted to get folk's opinion on the need to actually produce an
>> S[P]C form factor board. ... is it OK to have the MEM11 be outside of
>> the 11/20 chassis and connect via BC11A (my replica) cables?
>
On Mon, Feb 8, 2016 at 3:30 PM, Guy Sotomayor wrote:
>> On 2/8/16 10:09 AM, Guy Sotomayor wrote:
>>> So, things are moving forward. I also wanted to get folk's opinion on
>>> the need to actually produce
>>> an SPC form factor board. In other words (and sort of in line with how
>>> peripherals w
> From: Guy Sotomayor
> I also wanted to get folk's opinion on the need to actually produce an
> S[P]C form factor board. ... is it OK to have the MEM11 be outside of
> the 11/20 chassis and connect via BC11A (my replica) cables?
Well, that's going to up the cost; for some people
On 2/8/16 11:53 AM, Al Kossow wrote:
On 2/8/16 10:09 AM, Guy Sotomayor wrote:
So, things are moving forward. I also wanted to get folk's opinion
on the need to actually produce
an SBC form factor board. In other words (and sort of in line with
how peripherals were done on the
original 11/
On Mon, Feb 8, 2016 at 11:53 AM, Al Kossow wrote:
>
>
> On 2/8/16 10:09 AM, Guy Sotomayor wrote:
>
>> So, things are moving forward. I also wanted to get folk's opinion on
>> the need to actually produce
>> an SBC form factor board. In other words (and sort of in line with how
>> peripherals we
On 2/8/16 10:09 AM, Guy Sotomayor wrote:
So, things are moving forward. I also wanted to get folk's opinion on the need
to actually produce
an SBC form factor board. In other words (and sort of in line with how
peripherals were done on the
original 11/20) is it OK to have the MEM11 be outsi
On 7/22/15 7:12 AM, Noel Chiappa wrote:
So, I noticed that on some QBUS cards DEC used a quad transceiver with
tri-state output (on the card side), the AM2908PC. It has separate tri-state
drive enable, and bus drive enable, pins. The FPGA we were looking at
supports bi-directional pins (i.
> From: Guy Sotomayor
> I haven't looked, but I think the Unibus and QBus are comparable in
> terms of pin count.
Well... the QBUS does have those shared address/data lines, so its 'raw'
count (i.e. number of wired-or broadcast bus lines) is somewhat lower (-16
data pins, but +4 addre
Made a lot of progress today.
I just wrote a "hello world" program and got it working so the UART
output shows up on the simulator.
Took a bit more work as there were a couple of subtle bugs lurking in
paths I hadn't fully exercised
previously (it's the nature of things). It was more complicat
On 7/21/15 10:23 AM, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Guy Sotomayor
Sent: Monday, July 20, 2015 11:04 PM
To: General@main.local ; Discussion@main.local:On-Topic and Off-Topic
Posts
Subject: MEM11 Update
As I mentioned previously, I took some time off from working on
-Oorspronkelijk bericht-
From: Guy Sotomayor
Sent: Monday, July 20, 2015 11:04 PM
To: General@main.local ; Discussion@main.local:On-Topic and Off-Topic Posts
Subject: MEM11 Update
As I mentioned previously, I took some time off from working on the
MEM11 for the past several months.
I had
On 7/21/15 6:25 AM, Noel Chiappa wrote:
It was interesting to re-read your original message; I and a couple of other
people are looking into doing a QBUS card to provide access to modern
non-volatile storage (SD cards, USB thumb drives), and in discussing the
internal design, we'd planned on an
> From: Guy Sotomayor
> I took some time off from working on the MEM11 ... I had some time over
> the past few days, so I spent it working on the simulator.
Excellent news!
> Right now all of the J1 instructions seem to simulate properly.
I had to go hunt up your original messa
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