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Re: [N8VEM-S100:3970] ALTAIR/IMSAI 8080 CPU replacement board

To: n8vem-s100@googlegroups.com
Subject: Re: [N8VEM-S100:3970] ALTAIR/IMSAI 8080 CPU replacement board
From: Todd Goodman <t...@bonedaddy.net>
Date: Thu, 5 Jun 2014 13:00:12 -0400
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References: <BAY175-W9D00E0DBC73486E672EB0B8420@phx.gbl> <005401cf66ef$50bc2c40$f23484c0$@YAHOO.COM> <5365B055.7060002@gmail.com> <BAY175-W481DC9F13B22EF09AB4263B8340@phx.gbl> <000001cf6eed$c281e170$4785a450$@vitasoft.org> <BAY175-W4567CA7A7D5229B14739DDB8330@phx.gbl> <BAY175-W500ACCC5E6380AAAD5B403B82D0@phx.gbl> <D79A8309-3582-4B3C-993D-A000AB386ED7@lafleur.us> <BAY175-W31C91F1DFCFE53A2989EA6B82D0@phx.gbl> <CAPBXkV6UAM-Sj9KXOsyddUX6RYpr3O4QhxsG+39u7XM1GHPu9w@mail.gmail.com>
User-agent: Mutt/1.5.23 (2014-03-12)

Hi Josh,

I'd also like three boards when they're ready and 6 LM323Ks if you have
them.

Thanks,

Todd

* Fabio Battaglia <hkzl...@gmail.com> [140605 02:12]:
> Hi Josh!
> I'd like 3 boards myself, when ready for production!
> Thanks,
> Fabio
> On Jun 5, 2014 7:55 AM, "Crusty OMO" <crus...@hotmail.com> wrote:
> 
> > Thanks Tom,
> >
> > I'll put you down for 2 boards and 3 LM323K's.  I'll try to make trip
> > across the boarder to ship them from the US side... let's see how the
> > timing works.
> >
> > Cheers,
> > Josh Bensadon
> >
> >
> > ------------------------------
> > Subject: Re: [N8VEM-S100:3966] ALTAIR/IMSAI 8080 CPU replacement board
> > From: laf...@lafleur.us
> > Date: Wed, 4 Jun 2014 22:35:06 -0400
> > To: n8vem...@googlegroups.com
> >
> > I'll take two when your ready
> >
> >
> > Good work.
> >
> > ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~
> > Sent from my Phone
> >
> >
> > On Jun 4, 2014, at 10:19 PM, Crusty OMO <crus...@hotmail.com> wrote:
> >
> > Hi Guys,
> >
> > Well I'm finally done laying out this board.  The autorouter only produced
> > swiss cheese with over 900 via's.  It looked terrible!
> > Anyway, I scrapped everything the autorouter did initially, and proceeded
> > to layout the traces manually.  Once I got what I thought was all the hard
> > parts done, I let the autorouter have another go at it.  Again it did not
> > work out so well and it was unable to complete the board, so I proceeded to
> > undo it's changes and/or improve it's routing manually.  I squeezed those
> > traces in there tight, any tighter and they'll be popping off the board.
> > Anyway, I'm working on the silkscreen layer and ready to do a run.
> > Here's a picture of the board layout....
> > You can see the serial port connections on the top left, SD card to the
> > right of the 27C256 EPROM, parallel ports next to that and the ALTAIR and
> > IMSAI front panel connectors.  There are also a few jumpers around the
> > board to configure for CPU or Peripheral board only and ALTAIR/IMSAI mode.
> > Firmware for the board will be my next project, but I have to make
> > preparations for VCF-MW my priority.  Dave Ruske and I will be doing a
> > COSMAC 1802 exhibit there in September.
> >
> > <Pic.bmp>
> >
> >
> > Cheers,
> > Josh Bensadon
> >
> >
> >
> >
> > ------------------------------
> > From: crus...@hotmail.com
> > To: n8vem...@googlegroups.com
> > Subject: RE: [N8VEM-S100:3711] ALTAIR/IMSAI 8080 CPU replacement board
> > Date: Sun, 18 May 2014 00:57:20 +0000
> >
> > Hi Guys,
> >
> > Well, this project has just reached a milestone.  The hardware is tested
> > and working.  I had some rewiring to do to make it work for the ALTAIR, I
> > thought the ALTAIR and IMSAI front panels were (near) identical, but they
> > are not.
> > There are some jumpers on the board to configure between ALTAIR and IMSAI.
> >
> > Here's a picture of my debugging and testing setup.  The board is being
> > tested in the ALTAIR.
> >
> > <IMG_1527.JPG>
> >
> >
> > Now entering Phase 2... building a PCB.
> >
> > Cheers,
> > Josh Bensadon
> >
> >
> > ------------------------------
> > From: mon...@vitasoft.org
> > To: n8vem...@googlegroups.com
> > Subject: RE: [N8VEM-S100:3666] ALTAIR/IMSAI 8080 CPU replacement board
> > Date: Tue, 13 May 2014 13:56:05 -0700
> >
> > Very nice Josh!
> >
> > John
> >
> >
> >
> > *From:* n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com
> > <n8vem...@googlegroups.com>] *On Behalf Of *Crusty OMO
> > *Sent:* Tuesday, May 13, 2014 1:19 PM
> > *To:* n8vem...@googlegroups.com
> > *Subject:* RE: [N8VEM-S100:3664] ALTAIR/IMSAI 8080 CPU replacement board
> >
> >
> >
> > Hi Group,
> >
> > Well, I'm cooking up this board at the moment.  I have all the hardware
> > figured out to run like the original CPU boards.
> > I need to do a little more testing of the hardware, then I'll proceed to
> > building the boards.
> > The Memory, I/O, UARTs and SPI interface to the SD card appear to all be
> > working.
> > 8K chunks of memory can become either ROM, RAM or mapped off the board.
> >
> > CPU: 8080A
> > UARTS: 2x 8250
> > RAM: 2x 32K
> > ROM: 32K
> > I/O: 8 input, 6 output pins
> > SPI to SD Card interface
> > ALTAIR & IMSAI Front Panel Connectors.
> >
> > Where ROM is selected in a block it overlaps the RAM on reads, but writes
> > go through to RAM.
> > The ROM can then be disabled and reads will come from the RAM at that
> > location.
> > The firmware is copying itself to RAM then switching off the ROM.
> > The CPU can be deselected with jumpers and the board will work as RAM/ROM
> > and I/O for another CPU on the bus.
> >
> > Pictures attached.  Yellow-Data, Brown-Address, Blue-I/O,
> > Green-Control/Status & everything else.
> >
> > Regards,
> > Josh Bensadon
> >
> >
> >
> >
> > --
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References:
- RE: [N8VEM-S100:3472] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Crusty OMO <crus...@hotmail.com>
- RE: [N8VEM-S100:3474] ALTAIR/IMSAI 8080 CPU replacement board
  - From: "Andrew Lynch" <LYN...@YAHOO.COM>
- Re: [N8VEM-S100:3479] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Rob Doyle <radi...@gmail.com>
- RE: [N8VEM-S100:3494] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Crusty OMO <crus...@hotmail.com>
- RE: [N8VEM-S100:3664] ALTAIR/IMSAI 8080 CPU replacement board
  - From: "John Monahan" <mon...@vitasoft.org>
- RE: [N8VEM-S100:3666] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Crusty OMO <crus...@hotmail.com>
- RE: [N8VEM-S100:3711] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Crusty OMO <crus...@hotmail.com>
- Re: [N8VEM-S100:3964] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Tom Lafleur <laf...@lafleur.us>
- RE: [N8VEM-S100:3966] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Crusty OMO <crus...@hotmail.com>
- RE: [N8VEM-S100:3968] ALTAIR/IMSAI 8080 CPU replacement board
  - From: Fabio Battaglia <hkzl...@gmail.com>

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