Guest
On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:
<mike.terrell@earthlink.net> wrote:
Diskette?
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Michael A. Terrell
Guest
krw@attt.bizz wrote:
Sloppy disk. The drive in mine was bad,
On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
Mark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
Diskette?
Sloppy disk. The drive in mine was bad,
M
Mark Zenier
Guest
In article <sPydnRI_Ds0igYbMnZ2dnUVZ_q6dnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
probably has scanned the schematic and posted it on on of the document
archives.
Yea, there are reasons that nobody used the 8275 much. I lucky to
find a 1984 databook with its datasheet on the top of my pile of boxes
of databooks.
Yuck. It was one of many Intel peripheral chips from the late '70s
that took the wrong road. It is a programmable video counter chain
(like the 6845, the one used on the IBM video cards), but instead of
outputting all the address bits to feed an external memory, it had two
internal 80 character display buffers that were loaded by program or DMA.
(So the driver had to babysit it, making sure it got a new line of text
every milisecond or so). In operation, it only output the data byte, the
row counter, and some attribute bits to feed the character font ROM.
(Using it for graphics, at one display line per row of data would
either have saturated the micro's databus, or isn't even be possible).
It only works at the level of characters, the video serializer and
dot-per-character counters were external TTL. It only ran at 2 or 3 MHz.
Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Yes. (Overdesigned slug). There were enough of them around that somebodyMark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
probably has scanned the schematic and posted it on on of the document
archives.
Yea, there are reasons that nobody used the 8275 much. I lucky to
find a 1984 databook with its datasheet on the top of my pile of boxes
of databooks.
Yuck. It was one of many Intel peripheral chips from the late '70s
that took the wrong road. It is a programmable video counter chain
(like the 6845, the one used on the IBM video cards), but instead of
outputting all the address bits to feed an external memory, it had two
internal 80 character display buffers that were loaded by program or DMA.
(So the driver had to babysit it, making sure it got a new line of text
every milisecond or so). In operation, it only output the data byte, the
row counter, and some attribute bits to feed the character font ROM.
(Using it for graphics, at one display line per row of data would
either have saturated the micro's databus, or isn't even be possible).
It only works at the level of characters, the video serializer and
dot-per-character counters were external TTL. It only ran at 2 or 3 MHz.
Mark Zenier mzenier@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)
Guest
On Wed, 13 Feb 2013 21:19:15 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:
x86) around work, networked together over one of their servers. All
of them went in the trash heap a quarter century ago. They worked but
they were *SLOW*.
<mike.terrell@earthlink.net> wrote:
That would be a diskette. We had a pile of the MDS systems(mostlykrw@attt.bizz wrote:
On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
Mark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
Diskette?
Sloppy disk. The drive in mine was bad,
x86) around work, networked together over one of their servers. All
of them went in the trash heap a quarter century ago. They worked but
they were *SLOW*.
M
Michael A. Terrell
Guest
Mark Zenier wrote:
It's one of the few things I don't miss from the rental warehouse I
lost when I got sick, and couldn't work for two years.
I have a databook with it as well. It looks like you were to buy
their development kit to learn to program all the registers. It's no
wonder that it wasn't popular.
It was covered in the CRT Controller Handbook, but I misplaced my
copy long ago.
In article <sPydnRI_Ds0igYbMnZ2dnUVZ_q6dnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Mark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
Yes. (Overdesigned slug). There were enough of them around that somebody
probably has scanned the schematic and posted it on on of the document
archives.
It's one of the few things I don't miss from the rental warehouse I
lost when I got sick, and couldn't work for two years.
Yea, there are reasons that nobody used the 8275 much. I lucky to
find a 1984 databook with its datasheet on the top of my pile of boxes
of databooks.
I have a databook with it as well. It looks like you were to buy
their development kit to learn to program all the registers. It's no
wonder that it wasn't popular.
Yuck. It was one of many Intel peripheral chips from the late '70s
that took the wrong road. It is a programmable video counter chain
(like the 6845, the one used on the IBM video cards), but instead of
outputting all the address bits to feed an external memory, it had two
internal 80 character display buffers that were loaded by program or DMA.
(So the driver had to babysit it, making sure it got a new line of text
every milisecond or so). In operation, it only output the data byte, the
row counter, and some attribute bits to feed the character font ROM.
(Using it for graphics, at one display line per row of data would
either have saturated the micro's databus, or isn't even be possible).
It only works at the level of characters, the video serializer and
dot-per-character counters were external TTL. It only ran at 2 or 3 MHz.
It was covered in the CRT Controller Handbook, but I misplaced my
copy long ago.
M
Michael A. Terrell
Guest
krw@attt.bizz wrote:
Well, the old guy that read the bits to & from the 1 MHz processer
WAS old. ;-)
I am still amazed that Vital Industries was able to do real time NTSC
color video effects with a 2 MHz Z80B and meet FCC requirements for
broadcast.
On Wed, 13 Feb 2013 21:19:15 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
krw@attt.bizz wrote:
On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
Mark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
Diskette?
Sloppy disk. The drive in mine was bad,
That would be a diskette. We had a pile of the MDS systems(mostly
x86) around work, networked together over one of their servers. All
of them went in the trash heap a quarter century ago. They worked but
they were *SLOW*.
Well, the old guy that read the bits to & from the 1 MHz processer
WAS old. ;-)
I am still amazed that Vital Industries was able to do real time NTSC
color video effects with a 2 MHz Z80B and meet FCC requirements for
broadcast.
Guest
On Thu, 14 Feb 2013 13:15:11 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:
their way out of a paper bag. M$ took lessons from them. ;-)
<mike.terrell@earthlink.net> wrote:
It wasn't so much that the processor was slow but Intel couldn't codekrw@attt.bizz wrote:
On Wed, 13 Feb 2013 21:19:15 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
krw@attt.bizz wrote:
On Tue, 12 Feb 2013 23:55:12 -0500, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:
Mark Zenier wrote:
In article <rM6dnTC7stIyY4rMnZ2dnUVZ_sSdnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
Now tell everyone how you designed dozens of commercial products with
the 8275. (Which was designed for 8085 based systems.) I don't recall
ever seeing one in any hardware. The 6545/6845 and the 5027 CRTC were
what I've seen.
The Intel MDS blue box system used it, if someone wants a design
example.
Was that their 8085 development system with the 8" disk drive?
Diskette?
Sloppy disk. The drive in mine was bad,
That would be a diskette. We had a pile of the MDS systems(mostly
x86) around work, networked together over one of their servers. All
of them went in the trash heap a quarter century ago. They worked but
they were *SLOW*.
Well, the old guy that read the bits to & from the 1 MHz processer
WAS old. ;-)
I am still amazed that Vital Industries was able to do real time NTSC
color video effects with a 2 MHz Z80B and meet FCC requirements for
broadcast.
their way out of a paper bag. M$ took lessons from them. ;-)
M
Michael A. Terrell
Guest
krw@attt.bizz wrote:
So instead of 'Intel Inside' it should be 'Intel, wrapped in heavy
chains & locked in a dark, damp basement'?
It wasn't so much that the processor was slow but Intel couldn't code
their way out of a paper bag. M$ took lessons from them. ;-)
So instead of 'Intel Inside' it should be 'Intel, wrapped in heavy
chains & locked in a dark, damp basement'?