Altair 8800 - Google Groups

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Welcome to the Altair 8800 Google Group. This group is for the discussion of anything related to the MITS Altair 8800 computer and other vintage S100 computer hardware and software.

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Walt Perko, Patrick Linstruth10

Jun 21

Differences ??? 8080 v. Z80 ???

Hi, Seems the cable connecting my Altair 8800c and the Port 0 of the ZAltair Z80c computer was

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Differences ??? 8080 v. Z80 ???

Hi, Seems the cable connecting my Altair 8800c and the Port 0 of the ZAltair Z80c computer was

Jun 21

Jun 19

EasyEDA S-100 Template ...

Hi, Okay, here's a blank template S-100 board ... How to use it with EasyEDA? After downloading,

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EasyEDA S-100 Template ...

Hi, Okay, here's a blank template S-100 board ... How to use it with EasyEDA? After downloading,

Jun 19

Jun 17

HAYES 2400 SMARTMODEM ... Less than $30! ...

Hi, After the last ZOOM, talking about the WiFi Retromodem for Hayes Smartmodem I decided to look for

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HAYES 2400 SMARTMODEM ... Less than $30! ...

Hi, After the last ZOOM, talking about the WiFi Retromodem for Hayes Smartmodem I decided to look for

Jun 17

Walt Perko, Mike Douglas3

Jun 15

How to compile an MBASIC program ???

Here's a session compiling, linking and running SAMPLE.BAS that's on the BASCOM.DSK disk

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How to compile an MBASIC program ???

Here's a session compiling, linking and running SAMPLE.BAS that's on the BASCOM.DSK disk

Jun 15

Walt Perko, Mike Douglas2

Jun 13

Here is some history and sources for the program often called LS on CP/M systems. Shouldn't be

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Here is some history and sources for the program often called LS on CP/M systems. Shouldn't be

Jun 13

Walt Perko, Joseph Corda3

Jun 10

For the Collectors ...

Walt Thanks for sharing these .. So I've already collected a few KayPro 2's and an Osborne,

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For the Collectors ...

Walt Thanks for sharing these .. So I've already collected a few KayPro 2's and an Osborne,

Jun 10

Jun 6

Why a MBASIC PONG game doesn't work as fast as hoped ...

Hi, I posted a demo of DECPONG-1 on YouTube https://www.youtube.com/watch?v=eo7uYDsaoH8 . On Friday,

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Why a MBASIC PONG game doesn't work as fast as hoped ...

Hi, I posted a demo of DECPONG-1 on YouTube https://www.youtube.com/watch?v=eo7uYDsaoH8 . On Friday,

Jun 6

Walt Perko, Patrick Linstruth5

Jun 5

RS-232 OUT from 88-2SIOR1 Port 1 Address 18d/19d

They fail because either your cabling is wrong or there is something wrong with your program. Did you

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RS-232 OUT from 88-2SIOR1 Port 1 Address 18d/19d

They fail because either your cabling is wrong or there is something wrong with your program. Did you

Jun 5

Walt Perko, Patrick Linstruth2

Jun 1

Modern Magazines about Vintage Computers ???

This is one: https://www.computesgazette.com/ Mostly Commodore and Atari, but the Altair was featured

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Modern Magazines about Vintage Computers ???

This is one: https://www.computesgazette.com/ Mostly Commodore and Atari, but the Altair was featured

Jun 1

May 27

Got a Notice Today ...

Hi, Two Color LEDs: https://www.tme.com/us/en-us/katalog/tht-leds-rectangle_112903/params/b754_led-

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Got a Notice Today ...

Hi, Two Color LEDs: https://www.tme.com/us/en-us/katalog/tht-leds-rectangle_112903/params/b754_led-

May 27

Walt Perko, Joseph Corda3

May 22

How to delete odd files with odd filenames in CP/M 2.2?

Hi, I've tried *. etc. I keep getting the same message "No File" ... Then I ReBOOTed

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How to delete odd files with odd filenames in CP/M 2.2?

Hi, I've tried *. etc. I keep getting the same message "No File" ... Then I ReBOOTed

May 22

Walt Perko, … Peter Higgins12

May 19

Ripping the software off 5-1/4 in. Floppies ...

Sorry Walt - I please substitute "Kryoflux" with "Greaseweazle". I think the

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Ripping the software off 5-1/4 in. Floppies ...

Sorry Walt - I please substitute "Kryoflux" with "Greaseweazle". I think the

May 19

May 19

ESP32 FDC+ WiFi Adapter ...

Hi, 192.168.0.56 is the IP address of my ESP32 FDC+ adapter. I'm trying to connect with the

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ESP32 FDC+ WiFi Adapter ...

Hi, 192.168.0.56 is the IP address of my ESP32 FDC+ adapter. I'm trying to connect with the

May 19

Peter Sterrantino, … Patrick Linstruth6

May 17

Legacy Pixels VT100

Hi Patrick, Thanks for the info. Those two switches did the trick. Pete On Sun, May 17, 2026 at 11:19

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Legacy Pixels VT100

Hi Patrick, Thanks for the info. Those two switches did the trick. Pete On Sun, May 17, 2026 at 11:19

May 17

Walt Perko, … Patrick Linstruth12

May 15

BASH or other .HEX to .BIN Converter for Altair 8800 computers ???

Hi, Okay, that is probably the problem I was having with the AMON.HEX file. The XGPro TL866 II Plus

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BASH or other .HEX to .BIN Converter for Altair 8800 computers ???

Hi, Okay, that is probably the problem I was having with the AMON.HEX file. The XGPro TL866 II Plus

May 15

Walt Perko, … Tim Geuy5

May 15

ZOOM Meeting Starting Time Change?

I have a prior commitment this Sunday at that time - catch you all next week On Thursday, May 14,

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ZOOM Meeting Starting Time Change?

I have a prior commitment this Sunday at that time - catch you all next week On Thursday, May 14,

May 15

May 15

Anybody Need some .DSK Tools?

Hi, I haven't tried them yet: https://github.com/phatchman/altair_tools .

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Anybody Need some .DSK Tools?

Hi, I haven't tried them yet: https://github.com/phatchman/altair_tools .

May 15

Walt Perko, … Patrick Linstruth7

May 13

How to Assemble a small Assembly Program ???

Hi, That's my Typo ... Yes, the command line is: A:ASM FILENAME.AAZ and that works great. Then

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How to Assemble a small Assembly Program ???

Hi, That's my Typo ... Yes, the command line is: A:ASM FILENAME.AAZ and that works great. Then

May 13

May 8

Original MITS Altair 680 Manuals ...

Hi, Kind of pricey ... I recommend haggling a little on the price: https://bend.craigslist.org/ele/d/

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Original MITS Altair 680 Manuals ...

Hi, Kind of pricey ... I recommend haggling a little on the price: https://bend.craigslist.org/ele/d/

May 8

May 7

Great Prices for Vintage Computers and Peripherals ...

Hi, He's got Dual 8" Floppies Shugart and PerSci, Two IMSAI computers, Vector Graphic

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Great Prices for Vintage Computers and Peripherals ...

Hi, He's got Dual 8" Floppies Shugart and PerSci, Two IMSAI computers, Vector Graphic

May 7

Peter Sterrantino, … Peter Higgins4

May 5

S100 Board Template for KiCad

Hi Peter, Thanks for this. I'm relatively new to these forums so was unaware of Steve's

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S100 Board Template for KiCad

Hi Peter, Thanks for this. I'm relatively new to these forums so was unaware of Steve's

May 5

Walt Perko, Joseph Corda2

Apr 26

8080/8085 Simulator ...

Walt I have not . but thanks for the link .. I will bookmark to take a look at a later time Joe On

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8080/8085 Simulator ...

Walt I have not . but thanks for the link .. I will bookmark to take a look at a later time Joe On

Apr 26

Cristiano Paris, … Patrick Linstruth8

Apr 24

Faulty RAM board?

Thanks, this is kind of clarifying why certain bits are stuck across addresses. I will do some

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Faulty RAM board?

Thanks, this is kind of clarifying why certain bits are stuck across addresses. I will do some

Apr 24

Walt Perko, … Patrick Linstruth20

Apr 23

Examples of the AltMon commands?

Hi, With the help of ChatGPT, I'm slowly learning a little assembly/machine language programming.

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Examples of the AltMon commands?

Hi, With the help of ChatGPT, I'm slowly learning a little assembly/machine language programming.

Apr 23

Walt Perko, … Patrick Linstruth4

Apr 23

For those Restoring an Old Altair 8800 Computer ...

Mike D give me the tip to have front tracks go horizontal and the back tracks vertical (or vice versa

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For those Restoring an Old Altair 8800 Computer ...

Mike D give me the tip to have front tracks go horizontal and the back tracks vertical (or vice versa

Apr 23

Walt Perko, … Patrick Linstruth4

Apr 22

Here's an oddity ...

Are you sure the “B” command was booting to Serial CP/M at not a disk attached to the FDC+ Serial

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Here's an oddity ...

Are you sure the “B” command was booting to Serial CP/M at not a disk attached to the FDC+ Serial

Apr 22

Walt Perko, Patrick Linstruth2

Apr 21

Altair 8800c ... AMON ... Dump = Different Data ???

No, it looks right to me. 59h is Y and 60h is `, 61h is a, etc. If you wanting AZ, then the next

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Altair 8800c ... AMON ... Dump = Different Data ???

No, it looks right to me. 59h is Y and 60h is `, 61h is a, etc. If you wanting AZ, then the next

Apr 21

Peter Sterrantino, … Joseph Corda7

Apr 19

Alignment disk?

Peter It's all just baby steps.. I say grab what you can when you find it . and the pieces will

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Alignment disk?

Peter It's all just baby steps.. I say grab what you can when you find it . and the pieces will

Apr 19

Cristiano Paris, Peter Higgins3

Apr 12

Compupro System Support 1 and IMSAI 8080

Thanks for the useful info. Much appreciated. C. On Sun, Apr 12, 2026 at 12:44 AM Peter Higgins <

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Compupro System Support 1 and IMSAI 8080

Thanks for the useful info. Much appreciated. C. On Sun, Apr 12, 2026 at 12:44 AM Peter Higgins <

Apr 12

Dana Eckel, … Peter Higgins3

Apr 11

Looking for 88-SIOJP card

On Friday, April 10, 2026 at 4:31:26 AM UTC-7 waynee...@gmail.com wrote: I am looking to purchase an

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Looking for 88-SIOJP card

On Friday, April 10, 2026 at 4:31:26 AM UTC-7 waynee...@gmail.com wrote: I am looking to purchase an

Apr 11

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