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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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Walt Perko, … Patrick Linstruth6

Mar 25

Getting an Accurate BOM for the Don Caprio mini-Front Panel board ...

Hi, I have a Ref F board I'm trying to get working. My one Rev E is inside the IMSAI-JAIR CBBS

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Getting an Accurate BOM for the Don Caprio mini-Front Panel board ...

Hi, I have a Ref F board I'm trying to get working. My one Rev E is inside the IMSAI-JAIR CBBS

Mar 25

Joseph Corda, Walt Perko4

Mar 23

IMSAI 8080’s baby brother

Hi, My point is that the hardware is very different than the real Altair 8800 or IMSAI 8080 computers

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IMSAI 8080’s baby brother

Hi, My point is that the hardware is very different than the real Altair 8800 or IMSAI 8080 computers

Mar 23

Walt Perko, Terry Fox2

Mar 22

ZOOM Meeting Times ...

Either would be better for me, but don't change just for me. Terry On Sunday, March 22, 2026 at

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ZOOM Meeting Times ...

Either would be better for me, but don't change just for me. Terry On Sunday, March 22, 2026 at

Mar 22

Walt Perko, … Mike Douglas15

Mar 22

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

Here's how to make the Cromemco ZPU work with the Altair 8800c front panel interface board: https

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

Here's how to make the Cromemco ZPU work with the Altair 8800c front panel interface board: https

Mar 22

Walt Perko, … Peter Sterrantino4

Mar 22

Heathkit H19 Terminal Computer or NCR 7900 Terminal or GE Data Recorder

Hi Walt, Thanks for posting this! I had no idea Goodwill had on online site of this kind. Pete On Sat

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Heathkit H19 Terminal Computer or NCR 7900 Terminal or GE Data Recorder

Hi Walt, Thanks for posting this! I had no idea Goodwill had on online site of this kind. Pete On Sat

Mar 22

Peter Schmidl, … Joseph Corda12

Mar 20

GUI for fdc-sds command (Linux/MacOS)

Peter I will test Linux later tonight/ tomorrow morning Joe On Fri, Mar 20, 2026 at 19:11 Peter

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GUI for fdc-sds command (Linux/MacOS)

Peter I will test Linux later tonight/ tomorrow morning Joe On Fri, Mar 20, 2026 at 19:11 Peter

Mar 20

Walt Perko, Patrick Linstruth3

Mar 20

RUN & WAIT ON All the Time ???

Hi, I hate getting old ... I thought I scanned and checked my soldering the mini-Front Panel, but I

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RUN & WAIT ON All the Time ???

Hi, I hate getting old ... I thought I scanned and checked my soldering the mini-Front Panel, but I

Mar 20

Mar 18

A Better BreakOut for the Altair Front Panel Wiring ???

Hi, I think I got it about 90% of the way in EasyEDA! Now I need to learn how to have a AutoRouter

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A Better BreakOut for the Altair Front Panel Wiring ???

Hi, I think I got it about 90% of the way in EasyEDA! Now I need to learn how to have a AutoRouter

Mar 18

Todd Houg, … Mike Douglas3

Mar 16

SSM IO4 debugging

Ext CLR is only asserted by the front panel operator. The idea was to use it as separate reset signal

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SSM IO4 debugging

Ext CLR is only asserted by the front panel operator. The idea was to use it as separate reset signal

Mar 16

Mar 13

Cromemco PRI Rev B (020-0023) board ...

Hi, Does the board you have 74LS374 ICs or 74LS373 ICs ??? This is supposed to be the PINOUTs for the

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Cromemco PRI Rev B (020-0023) board ...

Hi, Does the board you have 74LS374 ICs or 74LS373 ICs ??? This is supposed to be the PINOUTs for the

Mar 13

Mar 12

ZAltair Z80c #2 Fails ...

Hi, This is the results from chip testing ... the only chips I can't test with my RLG Tauntek

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ZAltair Z80c #2 Fails ...

Hi, This is the results from chip testing ... the only chips I can't test with my RLG Tauntek

Mar 12

Walt Perko, Joseph Corda2

Mar 9

Finding Manuals ...

Thanks Walt ! On Mon, Mar 9, 2026 at 12:16 AM Walt Perko <r4r...@gmail.com> wrote: Hi, Per the

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Finding Manuals ...

Thanks Walt ! On Mon, Mar 9, 2026 at 12:16 AM Walt Perko <r4r...@gmail.com> wrote: Hi, Per the

Mar 9

Joseph Corda, … Patrick Linstruth10

Mar 7

Zoom meeting Topic suggestion: How to rebuild/install CPM after a BIOS change

Patrick Yes I adjusted memsize to 62 .. BTW I think I still have a wiring mistake .. as the Cromemco

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Zoom meeting Topic suggestion: How to rebuild/install CPM after a BIOS change

Patrick Yes I adjusted memsize to 62 .. BTW I think I still have a wiring mistake .. as the Cromemco

Mar 7

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

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