Groups

Altair 8800

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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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Mike Douglas, Joseph Corda2

Mar 4

Building an Altair 680 in 2026

Thanks for sharing Mike ! On Wed, Mar 4, 2026 at 6:52 PM 'Mike Douglas' via Altair 8800 <

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Building an Altair 680 in 2026

Thanks for sharing Mike ! On Wed, Mar 4, 2026 at 6:52 PM 'Mike Douglas' via Altair 8800 <

Mar 4

Terry Fox, … Walt Perko17

Mar 3

Sol 20 up and running (I hope)

Hi, I forgot to add a 3D Printable file ... 5mm thick to increase vertical punching ... print two of

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Sol 20 up and running (I hope)

Hi, I forgot to add a 3D Printable file ... 5mm thick to increase vertical punching ... print two of

Mar 3

Walt Perko, … Joseph Corda13

Feb 24

FlexRAM board & AltMon ???

Oh I missed your last post .. well kept working it I'm sure you will fix On Tue, Feb 24, 2026 at

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FlexRAM board & AltMon ???

Oh I missed your last post .. well kept working it I'm sure you will fix On Tue, Feb 24, 2026 at

Feb 24

Walt Perko, … Joseph Corda7

Feb 24

OP-80A SetUp & Run Micro Soft BASIC v1.0 ...

Hi, Paper Tape Source ... I ran into this link: https://www.ebay.com/itm/296645013024 I bet

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OP-80A SetUp & Run Micro Soft BASIC v1.0 ...

Hi, Paper Tape Source ... I ran into this link: https://www.ebay.com/itm/296645013024 I bet

Feb 24

Peter Sterrantino, Patrick Linstruth3

Feb 23

Mods to ROMBOOT.ASM

Hi Patrick, Thanks for that. Looking thru the bootloader code I did get the feeling that there was

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Mods to ROMBOOT.ASM

Hi Patrick, Thanks for that. Looking thru the bootloader code I did get the feeling that there was

Feb 23

Walt Perko, … Joseph Corda17

Feb 22

Building Up the Oak ZAltair 8800c Computer ...

Hi, Seems I can't BOOT to an 8MB CP/M .dsk being the problem. The file I was BOOTing was a 360KB

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Building Up the Oak ZAltair 8800c Computer ...

Hi, Seems I can't BOOT to an 8MB CP/M .dsk being the problem. The file I was BOOTing was a 360KB

Feb 22

Walt Perko, Patrick Linstruth3

Feb 17

It's all a Comedy of Errors ...

Is “BO” the Amon command to boot? Not sure why it is returning a “?” If it's a valid command. Do

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It's all a Comedy of Errors ...

Is “BO” the Amon command to boot? Not sure why it is returning a “?” If it's a valid command. Do

Feb 17

Colton Parr, … Joseph Corda5

Feb 15

Power Supply Wiring for Altair 8800c

Colton Below is a link to the diagram on Walt's website I was thinking of .. It is for the 9 slot

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Power Supply Wiring for Altair 8800c

Colton Below is a link to the diagram on Walt's website I was thinking of .. It is for the 9 slot

Feb 15

Terry Fox, … Walt Perko9

Feb 14

Request info on editing disk image files.

Hi, Patrick, showing how to manipulate files in the AltairZ80Sim might make for a useful ZOOM demo

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Request info on editing disk image files.

Hi, Patrick, showing how to manipulate files in the AltairZ80Sim might make for a useful ZOOM demo

Feb 14

Feb 14

Index of deramp Altair 8800 Videos on YouTube ...

Hi, I've found if a little difficult to get to the video I want to watch sometimes on YouTube, so

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Index of deramp Altair 8800 Videos on YouTube ...

Hi, I've found if a little difficult to get to the video I want to watch sometimes on YouTube, so

Feb 14

Walt Perko, … Joseph Corda7

Feb 13

Which CP/M BOOT .DSK is Best ???

Thanks Patrick This was exactly what I was looking for... . Glad to hear the SIMH is being used so

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Which CP/M BOOT .DSK is Best ???

Thanks Patrick This was exactly what I was looking for... . Glad to hear the SIMH is being used so

Feb 13

Feb 9

Infocom Games for CP/M 2.2

Hey all! I've had an Altair 8800 clone from Mike Douglas for a few years, but started to more

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Infocom Games for CP/M 2.2

Hey all! I've had an Altair 8800 clone from Mike Douglas for a few years, but started to more

Feb 9

Peter Sterrantino, … Todd Houg9

Feb 9

Shugart Disk Drive Ribbon Cables

Power connector part numbers from the Shugart 800 manual, these are still available from Digikey and

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Shugart Disk Drive Ribbon Cables

Power connector part numbers from the Shugart 800 manual, these are still available from Digikey and

Feb 9

Walt Perko, Peter Sterrantino4

Feb 2

VDM-1 and the Processor Technology Subsystem B ...

Hi, No, you use a serial keyboard or an external terminal like in Mike's video. Watch the

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VDM-1 and the Processor Technology Subsystem B ...

Hi, No, you use a serial keyboard or an external terminal like in Mike's video. Watch the

Feb 2

Jan 28

Thought this Altair 8800 Collection Might be of Interest

Wanted to share with the community: my late father's Altair collection is at auction closing

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Thought this Altair 8800 Collection Might be of Interest

Wanted to share with the community: my late father's Altair collection is at auction closing

Jan 28

Jan 25

CCS 2718A SerialA setup .. Fixed ... Thanks to Patrick, Tim and Walt

This is a follow up conversation I had with Tim, Walt, and Patrick during our Zoom meeting tonight(

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CCS 2718A SerialA setup .. Fixed ... Thanks to Patrick, Tim and Walt

This is a follow up conversation I had with Tim, Walt, and Patrick during our Zoom meeting tonight(

Jan 25

Jan 23

TermDriver 2 ... a USB to Serial Adapter w/Video Display ...

Hi, Has anybody try one of these USB to TTL Serial adapter yet? https://www.crowdsupply.com/excamera/

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TermDriver 2 ... a USB to Serial Adapter w/Video Display ...

Hi, Has anybody try one of these USB to TTL Serial adapter yet? https://www.crowdsupply.com/excamera/

Jan 23

Terry Fox, … Patrick Linstruth6

Jan 19

Walt's boardset.

I understand Patrick, thanks. If Walt is willing to use Altmon instead of AMON, I can set his boards

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Walt's boardset.

I understand Patrick, thanks. If Walt is willing to use Altmon instead of AMON, I can set his boards

Jan 19

Joseph Corda, Patrick Linstruth5

Jan 17

AltairZ80 / Altair8800 SIMH - Is it possible to set memory range as Read Only?

Interesting .. Currently JoeMon is not so smart.. and as such It does not check RAM boundaries.

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AltairZ80 / Altair8800 SIMH - Is it possible to set memory range as Read Only?

Interesting .. Currently JoeMon is not so smart.. and as such It does not check RAM boundaries.

Jan 17

Walt Perko, Richard Fadden3

Jan 14

Reforming Capacitors ...

Hi, I don't think you're going to learn all that much from me as I should be considered a

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Reforming Capacitors ...

Hi, I don't think you're going to learn all that much from me as I should be considered a

Jan 14

Luke Anderson, Patrick Linstruth2

Jan 12

Altair 8800 build - troubleshooting Front Panel LED behavior

The S100 bus has separate data in and data out lines. The CPU is bidirectional. The front panel only

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Altair 8800 build - troubleshooting Front Panel LED behavior

The S100 bus has separate data in and data out lines. The CPU is bidirectional. The front panel only

Jan 12

Jan 9

A Slight Mention in Nuts&Volts ...

Hi, The Altair 8800 | Nuts & Volts Magazine https://www.nutsvolts.com/magazine/article/

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A Slight Mention in Nuts&Volts ...

Hi, The Altair 8800 | Nuts & Volts Magazine https://www.nutsvolts.com/magazine/article/

Jan 9

Walt Perko, Joseph Corda2

Jan 3

Sunday ZOOM #0018 ... FDD Connections ...

Walt and Patrick A fdc+ overview and discussion on Teac 55. Would be great for me ! I've been

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Sunday ZOOM #0018 ... FDD Connections ...

Walt and Patrick A fdc+ overview and discussion on Teac 55. Would be great for me ! I've been

Jan 3

Joseph Corda, Terry Fox4

Jan 1

Altair8800 or AltairZ80 SIMH and connecting console to a physical serial port?

ITS ALIVE !!! Thanks to Patrick Linstruth for his help.. as he guided me to the solution. A few

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Altair8800 or AltairZ80 SIMH and connecting console to a physical serial port?

ITS ALIVE !!! Thanks to Patrick Linstruth for his help.. as he guided me to the solution. A few

Jan 1

Walt Perko, … Joseph Corda9

12/28/25

Sunday ZOOM #17 ...

Patrick Sorry about my late reply ..wish I saw this earlier .. anyways I would like to see this next

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Sunday ZOOM #17 ...

Patrick Sorry about my late reply ..wish I saw this earlier .. anyways I would like to see this next

12/28/25

12/24/25

Anybody hear about this?

Hi, Are there any S-100 projects using an Arduino? https://arstechnica.com/gadgets/2025/11/arduinos-

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Anybody hear about this?

Hi, Are there any S-100 projects using an Arduino? https://arstechnica.com/gadgets/2025/11/arduinos-

12/24/25

Walt Perko, … Joseph Corda11

12/24/25

CromemCo ZPU board in an Altair 8800 or 8800c ...

Patrick That is GREAT progress.. Also thanks for all your effort on getting my ZPU card to work ! Joe

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CromemCo ZPU board in an Altair 8800 or 8800c ...

Patrick That is GREAT progress.. Also thanks for all your effort on getting my ZPU card to work ! Joe

12/24/25

Terry Fox, … Walt Perko3

12/23/25

YAY! Found the latest TDL ZPU board problem

Hi, Wow Great! I hope that's the last fix for the computer. So is that the 9-Slot Backplane, mini

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YAY! Found the latest TDL ZPU board problem

Hi, Wow Great! I hope that's the last fix for the computer. So is that the 9-Slot Backplane, mini

12/23/25

12/11/25

DigiTalker Demos ???

Hi, Has anybody seen a demo video of a DigiTalker singing a song? I can't seem to find one on

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DigiTalker Demos ???

Hi, Has anybody seen a demo video of a DigiTalker singing a song? I can't seem to find one on

12/11/25

12/9/25

TIC & SpeakJet Demo Video ...

Hi, This is a basic demo showing the stepper motor moving from the commands sent from my Altair 8800c

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TIC & SpeakJet Demo Video ...

Hi, This is a basic demo showing the stepper motor moving from the commands sent from my Altair 8800c

12/9/25

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