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Dial-Up CBBS Online: 305-515-9858 ... Protocol: 300 8N1 BAUD
After the modems connect, hold the ENTER key down until CBBS Responds

CBBS on Altair 8800c w/88-2SIOJP & FDC+ Serial Drive Server


CBBS + Altair 8800c + PMMI Modem

CBBS on J.A.I.R. SD Card and PMMI S-100 board Modem


CBBS on J.A.I.R. using COM2 to an External Modem

CBBS on J.A.I.R. using the FDC+ Serial Drive Server

66666

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88888

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CBBS on Altair 8800c w/88-2SIOJP & FDC+ Serial Drive Server
.

An Altair 8800c Computer Running CBBS with an 88-2SIOJP S-100 circuit board
.


I hope these notes can help others to setup their own little BBSes using the world's first BBS program "CBBS" from 1976.
. . .

This project took several days and a ton of work effort by a friend Patrick, to help me get the BBS up 'n running.
.
We first tried to get CBBS running on my IMSAI-JAIR computer which has an IMSAI mini-Front Panel and a J.A.I.R. single board S-100 computer circuit board.
As it turns out, this normally would be a project for the designer of the J.A.I.R. board to rewrite the boards CP/M BIOS to accommodate the needed functions.
. . ..
So, after a couple of weeks of beating on the IMSAI-JAIR computer, my friend Patrick decided we should try using my Altair 8800c computer and see if we can't
get that working correctly first.

. . . The Altair 8800c computer consists of just a few S-100 boards making it a good affordable computer for vintage (retro) computing hobbyists.

The assembly of the Altair 8800c is simple and somewhat documented on my own website: https://www.brainless.org/Altair/Altair8800c/index.html
. . . . . as well as the FarmTek website: (https://deramp.com/altair_8800c.html)

First, there is the reproduction MITS Altair 8800 Front Panel board with all the LEDs and switches, then comes the Front Panel Interface board which connects the front
. . . panel to the S-100 buss, then a reproduction MITS CPU BD board, then the Martin Eberhard 88-2SIOJP board and finally the FarmTek FDC+ board.

On the PC side I'm running the FarmTek FDC+ Serial Drive Software program that connects the computer to four floppy drives that I can swap out on the fly, as
. . . it uses the .DSK emulated floppy disks.

The first task was to get dial-up terminal programs working on both computers. Patrick reconfigured a few of the early terminal program; MODEM7, MODEM2-S,
. . . MODEM740 and IMP245.

All of the programs now run perfectly with the Altair 8800c computer. He also fixed a version of IMP245 for the IMSAI-JAIR.
. . . (https://www.brainless.org/Altair/Repository.html#section14)

These programs allow the console serial port Port 0 to function as normal while utility serial port Port 1 is connected to the modem.
. . . . .
I have a US Robotics 56K FAX modem on my Altair 8800c although Patrick wants me to get a HAYES 300 or 1200 SMARTMODEM to be more "vintage".
I'll get one when I can find a reasonable priced HAYES online.
. . . . .

In the meantime, with dial up terminals working on both computers Patrick learned more about the Martin Eberhard 88-2SIOJP dual serial board so he could start
. . . assembling the CBBS program for the Altair 8800c . . . it took a half-dozen configurations and tests, but he got it all figured out sending me each test to try on
my hardware (he lives in a state far east of where I live in Las Vegas).

. . . The following notes will help anybody with an Altair 8800c computer and almost any modem get CBBS up 'n running to dabble in 1976 vintage computing.

Setting Up the Martin Eberhard 88-2SIOJP board
. . . . .
First Set Jumpers as follows:
J1 = 4-5
. . . J2 = OPEN
J3 = 3-4
J4 = OPEN
. . . J5 = OPEN
J6 = OPEN
J7 = OPEN
. . . J8 = OPEN
J9 = OPEN
J10 = OPEN
. . . J11 = OPEN
J12 = OPEN
J13 = 2-3
. . . J14 = OPEN

Then set Port 1 DIP switch to 1200 bps:
. . . . .
I use the console serial port, Port 0 set at 9600 BAUD to be period compatible to connect to both my PC/TeraTerm terminal program or the various other terminals
I have (LILYGO TTGO ESP32 ADM-3A, VersaTerm, FabGL ESP32 VT-100 etc. all connected to thrift store supplied VGA monitors and PS/2 keyboards.)
. . . . .
On the far right of Figure 01, you can see the serial port DIP switch for Port 1 on the Martin Eberhard 88-2SIOJP board. You can see the various BAUD rates available
to the serial ports. The Port 1 BAUD setting should be at 1200 as in Figure 01.
. . . . .
After Reinserting the 88-2SIOJP board back into the Altair 8800c computer, the next step is to setup the modem for CBBS operations.

. . . (A personal note here: Why don't engineers design and install DIP switches so UP/CLOSED is ON and OFF/OPEN is DOWN to somewhat match simple Boolean/binary logic?)

The 4004 (Photo: Thomas Nguyen, CC BY-SA 4.0, via Wikimedia Commons)
. . . . .

The chip inventors and manufactures realized there needed to be a cost-effective way to identify PIN 1 of the thousands of chips that they knew would be coming.
Why didn't the manufacturers of the DIP switches have those smarts too? Simple make a small notch and/or dot to identify PIN 1 as the bottom left PIN on the
. . . DIP switch as OPEN?

I even asked A.I. about that;
. . . . .
Question: In Boolean logic, is up ON or OFF? A 1 or a 0?

. . . Answer: In Boolean logic, "up" or "ON" is typically represented as a logic level of "1," which is equivalent to "true" or "high." Conversely, "down" or "OFF"
is represented as a logic level of "0," which is equivalent to "false" or "low." These conventions are commonly used in digital electronics and computer science to
represent the binary values of true and false, or on and off.
. . . . .
Setting the Switches on the back of the US Robotics 56K FAX Modem

. . . On the back of the US Robotics modem I have there is a set of DIP switches that need to be configured as in the following image.
SW1 - UP (OFF)
SW2 - UP (OFF)
. . . SW3 - DOWN (ON)
SW4 - UP (OFF)
SW5 - UP (OFF)
. . . SW6 - UP (OFF)
SW7 - UP (OFF)
SW8 - DOWN (ON)
. . . . .
You can see the switch definitions on the bottom of the modem;
US Robotics 56K FAX Modem Switch Definitions
. . . . .
Now we need to assemble two special RS-232 cables to go from Port 0 (Altair 8800c console port) to the terminal or PC/TeraTerm terminal and Port 1 of the Altair 8800c
88-2SIOJP board to the modem to account for DCD so the modem can know when to hang-up the phone line when carrier is dropped.
. . . . .
Cable SetUp for Altair 8800c Port 0
CONSOLE CABLE:
. . . Isolate CONSOLE Port 0 so MODEM Port 1 has DCD Control
PIN 2 Rx <----- PIN 3 Tx
PIN 3 Tx -----> PIN 2 Rx
. . . PIN 7 GND <----> PIN 7 GND
Cable SetUp for Altair 8800c Port 1
MODEM CABLE:
. . . 2SIO-JP (PORT 1) to MODEM (DB25)
PIN 2 Rx <----- PIN 3 Tx
PIN 3 Tx -----> PIN 2 Rx
. . . PIN 5 RTS -----> PIN 20 DTR
PIN 7 GND <----> PIN 7 GND
PIN 20 DCD <----- PIN 8 DCD
. . . . .
Getting the US Robotics 56K FAX Modem SetUp

. . . With the 88-2SIOJP DIP switch set to 1200 bps we connect our special home-made RS-232 cable to the modem, then send an initialization string to limit the
US Robotics 56K FAX modem to connect only at 1200 BAUD.
US Robotics 56K FAX Modem 1200 BAUD INIT $tring:
. . . AT &F0 E0 Q2 S0=1 X4 Y0 &B0 &C1 &D2 &K0 &N2 &U2 &W0

Getting the Altair 8800c Front Panel Switches Ready to BOOT CBBS
. . .
Standard BOOT to Directly into the CBBS BBS:
A15 + A14 + A13 + A12 + A11 + A11 + A10 + A9 + A8 = UP ... A7 + A6 + A5 + A4 + A3 + A2 + A1 + A0 = DOWN
. . .

CBBS Front Panel Switch BOOTing Options:
. . . . . A13 = UP - Autoload CBBS on cold boot
A14 = UP - Check for console input (if A15 also UP)
A15 = UP - Enable modem DCD and data checks in BIOS
. . . . .
BOOT to the CP/M Prompt:
A15 + A14 + A13 DOWN
. . . A12 + A11 + A11 + A10 + A9 + A8 = UP
A7 + A6 + A5 + A4 + A3 + A2 + A1 + A0 = DOWN

. . .
Now, with everything setup correctly, cables are correct and connected it's time to do some testing.

. . . Running the 2SIOTEST.COM
I started with TeraTerm on my PC connected to Port 0 (Altair 8800c console port) and having two phone lines this made it easy for me to test CBBS.

. . . The CBBS program by default runs from a normal BOOT to the floppy so in order to run the 2SIOTEST program I need to BOOT to CP/M.
Set the front panel switches as so:
A15 + A14 + A13 + A12 + A11 + A11 + A10 + A9 + A8 = UP = BOOT from Drive A:
. . .
On the front panel switches:
POWER ON - STOP - RESET - EXAMINE
. . . . .
After the setting the BOOT address with the "EXAMINE" switch I then set the front panel switches as follows;
A15 + A14 + A13 DOWN
. . . . . A12 + A11 + A11 + A10 + A9 + A8 = UP

On the terminal screen you should see: (red text is what you type in to proceed)
. . .
56K CP/M 2.2b v1.2
For Altair 8Mb Serial Drive
. . . CBBS for modem on 2SIO Port B

A1>2SIOTEST
. . .
CBBS Test Program Version 0.1B
For MITS 88-2SIO Port 1/B
. . . Test 1: Checking DCD LOW
Test 1: PASSED
Test 2: Is TR light on modem OFF? YES
. . . Test 2: PASSED
Test 3: Is TR light on modem ON? YES
Test 3: PASSED
. . . Test 4: Checking CTS HIGH
Test 4: PASSED
Test 5: Checking DCD HIGH
. . . . . . . . . . . Dial into the CBBS modem from a remote modem.
[at this point I dial into the computer from my other computer running the imp245 terminal program]
. . . . . . . . Waiting for carrier from modem...press any key to abort
. . . . . Test 5: PASSED
Test 6: Did you see the "CBBS TEST" on the remote terminal? YES
Test 6: PASSED
. . . Test 7: Follow instructions on remote terminal.

. . . . . . . . Waiting for response...press any key to abort
. . . Test 7: PASSED
Test 8: Hang up modem with DTR
. . . . . . . . Waiting for carrier to drop...press any key to abort
. . . Test 8: PASSED
ALL TESTS PASSED

. . . . .
2SIOTEST Responses on my Terminal, MY IMSAI-JAIR Terminal Computer

. . . Again, running TeraTerm on my PC and a HAYES SMARTMODEM 1200 connected to my second phone line.
b>IMP
IMP v245 modem pgm (type M for Menu)
. . . Copyright (c) 1985, 1987 Irvin M. Hoff
Version for JAIR port 20H
Modem speed is: 1200 bps
. . .
B>COMMAND: T (Enter Terminal Mode to send and receive data from the modem)

. . . ATDT3055159858 (AT = Attention . . . DT = Dial Telephone with this Phone Number)
CONNECT

. . . . . CBBS TEST
Test 7: Enter the sum of 2 and 6: 8

. . . . . CBBS System Files to Customize
I used the "Notepad ++" Text Editor on my PC to alter the files (I also use Notepad ++ for MBASIC Programming to eliminate oddities from the regular
Windows Notepad program.)
. . . BULLETIN
FIRSTIME
NEWS
. . . PASSWORD
WELCOME

. . .

Canned & Ready to Go SetUp . . . . . CBBS-Altair8800c.zip
.


. . . . .



.


CBBS + Altair 8800c + PMMI Modem


Probably the Future CBBS
. . . . .
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CBBS on J.A.I.R. SD Card and PMMI S-100 board Modem

Before Going Live
First you need to edit these files to customize them to your BBS
. . . Your Location, Your Hardware etc.
BULLETIN
FIRSTIME
NEWS
PASSWORD
WELCOME
.
Standard BOOT to Directly into the CBBS BBS: . . .
A15 + A14 + A13= UP . All other Address Switches = DOWN
BOOT to the CP/M Prompt:
A14 = UP . . . All other Address Switches = DOWN

Key IMP245 Downloading Commands
.
COMMAND: TCC
COMMAND: T
. . . ATDT phone number
LogIN ... Goto Files "M"enu "R" to Receive a file
COMMAND: R filename
.

Canned & Ready to Go SetUp: . . . . . JAIR-CBBS-Canned.zip
.
Before Going Live
First you need to edit these files to customize them to your BBS
. . . Your Location, Your Hardware etc.
BULLETIN
FIRSTIME
. . . NEWS
PASSWORD
WELCOME
. . .
Latest 8MB CP/M for J.A.I.R.
. . . . .
Original 250KB CP/M for J.A.I.R.
. . . . .


. . . . .


. . . . .


. . . . .


. . . . .


CBBS on J.A.I.R. using COM2 to an External Modem


Hopefully the Future CBBS
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CBBS on J.A.I.R. using the FDC+ Serial Drive Server

Hopefully the Future CBBS
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