When you make the panel for the front, look at an option for us who may want to install an SMB front panel board
Thanks ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~ This is great!
I'll definitely be interested in the chassis, multiple fpmini boards and if someone does a group buy of paddles, those too.
Fabio
On Jun 7, 2014 6:53 AM, "Don Caprio" < ilv...@gmail.com> wrote:
Josh, Rich, and S-100 gang,
The Imsai front panel S-100 (aka fp-mini) was stalled for quite some
time. Family, work and
remodel project left no spare time.
Looks like we have new life on the project. Many, many thanks to
Josh who got one of prototype
boards and worked out the final bugs. Looks like The next prototype
should be our last before
production run.
This board is a bit pricey due to the cost of the mini paddle
switches. A completed set of paddle
switches goes for ~ $125.00. My source for the toggles left the
company so I'm finding a new
contact and pricing.
The FP-Mini and Josh's new 8080 board is going to make a fantastic,
two board complete system.
I'm working with a local sheet metal fabricator on a mini-chassis
based around the fp-mini and the
S-100 8 slot mother board. I needed a chassis design for the next
board layout. We'll need to move
switches around and provide mounting holes on the PCB. Anyone who
has ideas or experience
creating a photo mask for the Plexiglas section drop me a line. It
may be as simple as printing a
transparency on a laser printer.
Once I get a final price on the chassis I'll send out a notice to
see who's
interested. The more we order the cheaper they are. I've mocked up a
prototype of the chassis
for your review and comments.
Thanks.
<mini-fp-chassis-small.jpg>
<mini-fp-chassis-top-small.jpg>
On 06/ 6/14 07:55 AM, Crusty OMO wrote:
Thanks John,
Andrew,
That would be great if you could do a fill on the area around
the regulator, or perhaps walk me through it? The other error
about pads being next to each other doesn't matter, I just over
rule the computer's objection.
Cheers,
Josh
From: mon...@vitasoft.org
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:3991] ALTAIR/IMSAI 8080 CPU
replacement board
Date: Thu, 5 Jun 2014 21:26:15 -0700
Josh,
Andrew may be able to brush it up. He is a marvel at
that these things
John
Hi
John,
I uploaded the board, schematic(s), gerber files and
firmware file to the Wiki site.
Look in
Board Information, S-100 boards, S-100 ALTAIR-IMSAI
8080 CPU Board
The DRC produces 2 errors which I don't know how to
suppress.
1 error is a drill pad next to a mounting pad for the
SD card, I oversized the pads and they overlap.
Neither pad is an active pin or conductor, the drill
is just a pilot hole to position the SD card socket,
the pad is just to solder the body of the socket.
The other error(s) are from a bunch of traces I dumped
around the voltage regulator to act as some extra heat
sink. I should really do a "fill" in that area, but I
don't know how and it's just easier for me to zig zag
some wide traces to do the job. I ignore the errors,
the gerber files look good.
The firmware file is just a modification of my 8080
monitor program. It's been modified to use the 8250
UART's, and it also has the start of the SPI/SD card
interface. I only got as far as receiving the 0x01
status byte from the SD card, which means it
initialized successfully and I am able to talk to it.
In the weeks to come, I'll return to working on the
firmware to get it to boot CP/M from the SD card. But
first, I must make some progress with my ELF projects.
Cheers,
Josh Bensadon
From:
mon...@vitasoft.org
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:3982] ALTAIR/IMSAI 8080 CPU
replacement board
Date: Thu, 5 Jun 2014 09:20:20 -0700
Josh,
great work – you must have a lot of time on your
hands!
Could
you put me down for 2 boards.
Also
could you point me to the most current
schematic/board diagram
Thanks
John
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.
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.
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
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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