Serial cards...Re: FW: [Altair Computer Club] Re: Newbee to the group, Assembler & IDE ???
I updated several things on my webpage and added this one link below to help sort out the S-100 serial cards
There's a couple of links I still have to add to this which I should get to soon.
I also notated on there about the diff modes the SSM IO4 can emulate.
As for the Bitstreamer II, you mention on your website that it's compatible with the Altair.
I don't know which Altair software runs with a 8251 uart.
Just the 2502 uart(88-SIO), 6850 uart(88-2SIO, 88-UIO) and AY-5-1013 uart(88-UIO)
I suppose if you have a system running CP/M, then it would be possible to use this card.
W. Tom Sanderson wrote:
I’m having trouble with Yahoo, so I’m sending this direct.
Compatibility has been an issue for a long time. My statement that you needed a 6850 board was a little too broad. I forgot about the old boards. The early MITS boards and later MITS boards use different ports and IO chips. MITs software like BASIC, uses sense switch settings to set which IO is used. I’ve got a learning curve there. New MITS software and some user software assumes a Motorola 6850. CP/M tries to hide the hardware, but user programs can write directly to hardware.
Dan, Thanks for the info on the SSM board. This board will be useful in older systems. I see it has settings for 8251 too.
The SSM board is compatible with the SIOA.
There are two other MITS boards with a 6850:
The Turnkey board has a single port with address switches.
The 88-UIO has a single port with address switches. I noticed this one has a 19,200 baud setting.
>I updated severalthings on my webpage and added this one link below to help sort out the S-100serial cardsGreat work on this page. I like have an overview of S-100 IO chip usage with images and pdf links. Please add the Altair Turnkey Module to the list of boards with a Motorola 6850.
>There's a couple of links I still have to add to this which I should get tosoon.
>I also notated on there about the diff modes the SSM IO4 can emulate.
>http://www.vintagec omputer.net/ ragooman/ comp_s-100_ serial.htmlDan,
> As for theBitstreamer II, you mention on your website that it's compatible with theAltair.You are correct, the Bitstreamer II is not used by Altair software. A Bitstreamer II and 2SIO can exist is the came system with standard board addressing. I have the BIOS source for a Tarbell 1011D and M6850 IO and Tarbell with a Vector Graphic monitor. I also have the source code for VG serial monitors. I also have MDM 7.12 for the Bitstreamer.
> http://tom12. tech.officelive. com/RS232CSerial .aspx
> I don't know which Altair software runs with a 8251 uart.
> Just the 2502 uart(88-SIO) , 6850 uart(88-2SIO, 88-UIO) and AY-5-1013uart(88-UIO)
>I suppose if you have a system running CP/M, then it would be possible to usethis card.
The Bitstreamer can be useful for CP/M or if you are not running MITS softare. The monitor code may be useful until source code for a better 6850 monitor is found. The Bitstreamer is not useful for Altair BASIC or DOS.
- I am sure there's nothing overly special about my 88-DCDD drive, but I have not seen any pictures of the same version on the Internet. I posted some on my web site
The images that start with "thm_" are on the right, the large images are on the left. Most images don't also have a thumbnail. I need to update my site to make it clearer, but for now, that's the scoop.
- Hello Bill and All,
I encourage everyone to make picture of their equipment. There are a lot
of Altair variations. Your Altair may be special.
Bill's 88-DCDD has round switches, some have flat handle switches.
Bill's 88-DCDD has a buffer board with address switches, many have
Bill's 88-DCDD has a massive heat sink on the power supply, some have
dead power supplies.
Bill's front dress panel has write-protect, but the board has no LED.
What direction does the fan blow?
Is there duct tape on the case vents?
Is the delay cap on this buffer board installed? Is it cut to disable?
What model drives have a write protect sensor?
Did any 88-DCDD implement write-protect?
Document changes for A.C. drives - FD-5xx
How many screws are used to mount the drive?
What kind of spacer and mount are used on the back drive corner in the
--- In firstname.lastname@example.org, billdeg@... wrote:
> I am sure there's nothing overly special about my 88-DCDD drive, but I
have not seen any pictures of the same version on the Internet. I
posted some on my web site
> The images that start with "thm_" are on the right, the large images
are on the left. Most images don't also have a thumbnail. I need to
update my site to make it clearer, but for now, that's the scoop.
- i never paid much attention to this, but it looks like MITS did make
some improvements along the way. my two DCDD drives are serial numbers
0923 and 0925 and they look just a bit different on the inside. the
most glaring change is the cables. my drives do not have nice clean
manufactured ribbon cables. i had to solder single conductor wires to
all the connectors.
this is one of those "when i was a kid, i had to walk five miles to
school, up hill, in the middle of a tornado" stories you heard from your