[REQUEST] IBM 8514/A & XGA adapters

Discussion of development and patch submission.
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ppgrainbow
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[REQUEST] IBM 8514/A & XGA adapters

Post by ppgrainbow » Sun 22 Apr, 2018 6:31 am

When IBM rolled out the Personal System/2 launch models 30, 50, 60 and 80 on April 2, 1987, these models had a integrated VGA chip. When VGA was introduced, IBM also introduced another display adapter, the IBM 8514/A.

The 8514/A display adapter offered 640 x 480 pixels @ 256 colours and 1024 x 768 pixels @ 256 colours out if 262,144 colours (18-bit). I believe that the PS/2 Model 50, 60 and 80 supported the 8514/A microchannel (MCA) adapter and was incompatible with any previous IBM graphics standards. Unfortuantely, IBM never built a ISA-based 8514/A board, but several clone manufacturers did so.

Here's some infomration on the IBM 8514/A display adapter: http://ohlandl.ipv7.net/video/8514A.html

Here's a better picture of the 8514/A MCA display adapter: https://upload.wikimedia.org/wikipedia/ ... M_8514.jpg


The 8514/a was succeeded by the IBM eXtended Graphics Adapter (XGA) released in 1990. Here's some information on the XGA-1 adapter: http://ps-2.kev009.com/ohlandl/video/XGA1.html

And here's some information on the IBM XGA-2 adapter: http://ps-2.kev009.com/ohlandl/video/XGA2.html

The XGA-1 adapter offered two resoulutions: 640 x 480 pixels @ 256 colours and 1024 x 78 pixels @ either 16 or 256 colours.

The XGA-2 adapter added a 24-bit DAC. However, it was only used to extended the 256-colour master palette and allow 256-grayscale output instead of the 64-grayscale out previously available. The XGA-2 adapter offered support for 800 x 600 SVGA modes up to 65,536 colours.

Here are some good photos of the XGA-2 adapter: http://www.vgamuseum.info/index.php/new ... 1397-xga-2

Now, if anyone has any other information regarding the IBM 8514/A, IBM XGA-1 and IBM XGA-2 adapters and how it can be implemented, let me know. :)

altheos
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Re: [REQUEST] IBM 8514/A & XGA adapters

Post by altheos » Mon 23 Apr, 2018 9:23 am

Interesting request though it's hard to find datasheet for theses cards. I hope they will be added to Pcem someday.

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ppgrainbow
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Re: [REQUEST] IBM 8514/A & XGA adapters

Post by ppgrainbow » Mon 23 Apr, 2018 4:23 pm

altheos wrote:
Mon 23 Apr, 2018 9:23 am
Interesting request though it's hard to find datasheet for theses cards. I hope they will be added to Pcem someday.
Yes, it is. Finding datasheets for these cards is difficult.

Greatpsycho
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Re: [REQUEST] IBM 8514/A & XGA adapters

Post by Greatpsycho » Sun 29 Apr, 2018 8:15 am

These documents are I/O port information of IBM 8514/A and XGA adaper. These may help to implement the emulation of IBM 8514/A and XGA card.
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XGA.TXT
I/O port information of XGA
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8514.TXT
I/O port information of IBM 8514/A
(30.58 KiB) Downloaded 11 times

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ppgrainbow
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Re: [REQUEST] IBM 8514/A & XGA adapters

Post by ppgrainbow » Sun 29 Apr, 2018 8:20 am

Greatpsycho wrote:
Sun 29 Apr, 2018 8:15 am
These documents are I/O port information of IBM 8514/A and XGA adaper. These may help to implement the emulation of IBM 8514/A and XGA card.
Thank you so much for the help. The documentation on the IBM 8514/A and XGA adapters are really helpful!

I can't wait to see the IBM 8514/A and XGA video cards being emulated soon! :D

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