>From: "Allison" <ajp166 at bellatlantic.net>
>
>>
>>Subject: Re: Memory chip substitute?
>> From: "Dwight K. Elvey" <dwight.elvey at amd.com>
>> Date: Mon, 15 Aug 2005 10:54:11 -0700 (PDT)
>> To: cctalk at classiccmp.org
>>
>>>From: "Allison" <ajp166 at bellatlantic.net>
>>>
>>>>
>>>>Subject: Memory chip substitute?
>>>> From: "Richard A. Cini" <rcini at optonline.net>
>>>> Date: Mon, 15 Aug 2005 11:12:20 -0400
>>>> To: CCTalk <cctalk at classiccmp.org>
>>>>
>>>>All:
>>>>
>>>> I'm repairing a few S100 memory boards and I'm having trouble
>>>>crossing a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D.
>>>>I have D5101LC1's "in stock". Are these equivalent?
>>>
>>>No, not even close.
>>>
>>>UPD410 is a fairly fast semistatic 4kx1. 5101 is cmos 256x4.
>>>
>>>What memory board has a upd410 on it? Very unusual.
>>>
>>>
>>>Allison
>>>
>>
>>Hi
>> It seems like 4044 and 6044 are both 4Kx1 chips. These
>>were used on HeathKit H8 8K memory boards. I'd suspect that
>>they might work. The onlt source I've found is a local
>>place called Anchor Electronics. I don't recall if they
>>have a web page.
>>Dwight
>
>Not even close. The upd410 is 18pin .6" centers. Pins are the same as
>TMS4060 and intel 2107 save for the 410 had a static core, the other were
>dynamic.
>
>
>Allison
>
Ahhh! 0.6 centers. Seems like I've seen these on something
else I have for a KIM expansion card. I do have a NEC data
book someplace with the specs on the UPD410D's. It might
also include a cross reference. Some of the data books did
this.
Dwight
>From: "Jim Leonard" <trixter at oldskool.org>
>
>Tony Duell wrote:
>>>>Sounds like the cards were approximately contemporary.
>>>
>>>That's perfectly reasonable. It could be that the Serial card was meant
>>>for local interfacing to serial peripherals while the Communications card
>>>was meant for "high-speed" telecommunications applications.
>>
>> Yes. The bit-banger is fairly usless for serial input, although it's fine
>> for output. I suspect it was mainly used for driving a serial printer (I
>
>Can someone clarify what "bit-banger" means and why it was different from a
>contemporary serial interface card?
>
Hi Jim
Bit-banging usually means that there is no uart or even a shift
register. There is a single bit port that the data is directly
sent from the main processor. It requires that the processor
produce all the bit timing. Things like clock interrupts
or variable refresh would be bad( with the exception that the
clock interrupt could be the timing for a fast processor ).
Dwight
>
>Subject: Re: Memory chip substitute?
> From: "Dwight K. Elvey" <dwight.elvey at amd.com>
> Date: Mon, 15 Aug 2005 10:54:11 -0700 (PDT)
> To: cctalk at classiccmp.org
>
>>From: "Allison" <ajp166 at bellatlantic.net>
>>
>>>
>>>Subject: Memory chip substitute?
>>> From: "Richard A. Cini" <rcini at optonline.net>
>>> Date: Mon, 15 Aug 2005 11:12:20 -0400
>>> To: CCTalk <cctalk at classiccmp.org>
>>>
>>>All:
>>>
>>> I'm repairing a few S100 memory boards and I'm having trouble
>>>crossing a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D.
>>>I have D5101LC1's "in stock". Are these equivalent?
>>
>>No, not even close.
>>
>>UPD410 is a fairly fast semistatic 4kx1. 5101 is cmos 256x4.
>>
>>What memory board has a upd410 on it? Very unusual.
>>
>>
>>Allison
>>
>
>Hi
> It seems like 4044 and 6044 are both 4Kx1 chips. These
>were used on HeathKit H8 8K memory boards. I'd suspect that
>they might work. The onlt source I've found is a local
>place called Anchor Electronics. I don't recall if they
>have a web page.
>Dwight
Not even close. The upd410 is 18pin .6" centers. Pins are the same as
TMS4060 and intel 2107 save for the 410 had a static core, the other were
dynamic.
Allison
I'll have to dig, I may still have a few. They were discontinued by NEC bad around
1980.
Allison
>
>Subject: RE: Memory chip substitute?
> From: "Richard A. Cini" <rcini at optonline.net>
> Date: Mon, 15 Aug 2005 13:51:05 -0400
> To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk at classiccmp.org>
>
>The board is a Solid State Music MB7 16k board. I have (at least) one bad
>chip on it.
>
>
>
>-----Original Message-----
>From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
>On Behalf Of Allison
>Sent: Monday, August 15, 2005 1:34 PM
>To: cctalk at classiccmp.org
>Subject: Re: Memory chip substitute?
>
>
>>
>>Subject: Memory chip substitute?
>> From: "Richard A. Cini" <rcini at optonline.net>
>> Date: Mon, 15 Aug 2005 11:12:20 -0400
>> To: CCTalk <cctalk at classiccmp.org>
>>
>>All:
>>
>> I'm repairing a few S100 memory boards and I'm having trouble
>crossing
>>a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D. I
>>have D5101LC1's "in stock". Are these equivalent?
>
>No, not even close.
>
>UPD410 is a fairly fast semistatic 4kx1. 5101 is cmos 256x4.
>
>What memory board has a upd410 on it? Very unusual.
>
>
>Allison
I was contacted by this guy who makes music using old synths and vintage
8-bitters as instruments.
You can hear one of his songs here:
http://www.myspace.com/quarknova
Note: requires a modern browser with fancy plug-ins to play.
I'm thinking of booking a band like this to play at VCF 8.0.
What do you folks think?
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
This is something we don't hear a lot about on the list.
A lot of it is on-topic, and some of the more obscure kit was based on
fairly common single-board computers of their day. The PPG Wave ran
Flex on its Eurocom II board (powered by a 6809). The Fairlight was
based on two 6809 CPUs.
There was the old Greengate kit that plugged into Apple IIs, and an
editor for the Ensoniq Mirage that again ran on an Apple II.
I don't know what the Simmons SDX used but apparently it was a fairly
common SBC. I know the SDS7 has a 6802 on the CPU board.
Gordon.
>From: "Allison" <ajp166 at bellatlantic.net>
>
>>
>>Subject: Memory chip substitute?
>> From: "Richard A. Cini" <rcini at optonline.net>
>> Date: Mon, 15 Aug 2005 11:12:20 -0400
>> To: CCTalk <cctalk at classiccmp.org>
>>
>>All:
>>
>> I'm repairing a few S100 memory boards and I'm having trouble
>>crossing a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D.
>>I have D5101LC1's "in stock". Are these equivalent?
>
>No, not even close.
>
>UPD410 is a fairly fast semistatic 4kx1. 5101 is cmos 256x4.
>
>What memory board has a upd410 on it? Very unusual.
>
>
>Allison
>
Hi
It seems like 4044 and 6044 are both 4Kx1 chips. These
were used on HeathKit H8 8K memory boards. I'd suspect that
they might work. The onlt source I've found is a local
place called Anchor Electronics. I don't recall if they
have a web page.
Dwight
Dwight
>
>Subject: Re: ImageDisk and some 8" images posted
> From: Dave Dunfield <dave04a at dunfield.com>
> Date: Wed, 03 Aug 2005 05:58:03 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>>> IIRC, the Ensoniq Mirage had mixed sector sizes.
>>
>>Hey... I have one of those - it used to belong to my mother (she was a
>>professional musician).
>>
>>I'd love to have a way to image disks for it. I think I remembered
>>the disks were wierd, but not how they were wierd.
>
>Unfortunately it's looking like mixed sector sizes within one track are
>not within the capabilities of the 765 to write - although I could probably
>READ them OK (and with a documented image file format, you would at least
>have access to the data so you could try to find some other way to recreate
>the disks if you had to).
Dave there is a trick.
Looks at FCOPY at Gaby's (unoffical CPM archive). Tim and I developed it
for a project and it's not a generic imager. However we found a few things
out and one is that most 765 implmentations will lock up if in the worng
mode (SD or DD) initially. So to do mixed sector you can't write. However
reading is possible if you first try the mode that doesnt lock first then
switch.
In the end you will be recreating the catsweasel. If you really want to
go to the next level starty with a PC fast enough and skip the whole FDC
chip thing. The next level is a data speperator logic and a shift
register that can be read at the bit rate by the PC and do the needed
pattern regognition (look for sync, address marks and the like), and then
build a literally imaged disk and that can be anaylysed.
Allison
>
>Subject: Memory chip substitute?
> From: "Richard A. Cini" <rcini at optonline.net>
> Date: Mon, 15 Aug 2005 11:12:20 -0400
> To: CCTalk <cctalk at classiccmp.org>
>
>All:
>
> I'm repairing a few S100 memory boards and I'm having trouble
>crossing a memory chip on the SSM MB7 16k board. The chip is an NEC UPD410D.
>I have D5101LC1's "in stock". Are these equivalent?
No, not even close.
UPD410 is a fairly fast semistatic 4kx1. 5101 is cmos 256x4.
What memory board has a upd410 on it? Very unusual.
Allison
