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Our mission ...
This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.
This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.
Remain civil and respectful
There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.
Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.
This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.
Stay close to the original topic being discussed
Contribute something meaningful
To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
"PM Sent!" messages (or, how to use the Private Message system)
This forum has a private message feature that we want people to use for messages that are not of general interest to other members.
In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.
Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.
Copyright and other legal issues
We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.
Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.
Reporting problematic posts
If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.
If you are unsure you may consider sending a private message to a moderator instead.
New user moderation
New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.
New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.
Other suggestions
This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.
This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.
Remain civil and respectful
There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.
Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.
This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.
Stay close to the original topic being discussed
- If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
- If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.
Contribute something meaningful
To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
- This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
- Do not bump threads.
- Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
- Use the Private Message system for posts that are targeted at a specific person.
"PM Sent!" messages (or, how to use the Private Message system)
This forum has a private message feature that we want people to use for messages that are not of general interest to other members.
In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.
Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
- "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
- "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.
Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.
Copyright and other legal issues
We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.
Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.
Reporting problematic posts
If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.
If you are unsure you may consider sending a private message to a moderator instead.
New user moderation
New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.
New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.
Other suggestions
- Use Google, books, or other definitive sources. There is a lot of information out there.
- Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
- Spelling and grammar are not rated, but they do make a post easier to read.
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IBM PC ROM Dumps to Complete Collection
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*NIX CGA/MDA ROM font viewer
Attached, find a simple command-line viewer for CGA/MDA font files. Compiles fine on my Freebsd 8.1 machine, YMMV.
% gcc -o test main.c
[ and ] move through characters, m selects MDA font, c selects CGA. EOF ends.
BSD-licensed, so use and enjoy.
sbrk()Attached Files
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I mean the 84-key Model F board.Originally posted by modem7 View PostDid you mean the first AT keyboard or the second, or both?
Here's its controller chip:

On mine, the date code is 8441, but I don't think 8340 would be an unreasonable date code. And you'll see it isn't marked 8048 anywhere, despite being one.
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If the Enhanced 5170 keyboard was a 101-key Model M, I'd expect it to be a model 1390131, which uses a 6805. (Model 1390120 was the same thing but without the LED panel, for XTs).Originally posted by modem7 View PostThe Enhanced 5170 keyboard (the second keyboard) came out in '86 and so I'd expect that any date code in it to be from '85 or '86.
But I've been surprised too many times.
I guess the question may be answered if/when someone opens up their Enhanced 5170 keyboard.
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I'm more inclined now to believe that the 8048 was damaged (or perhaps the read failed because of a poor connection between it and the programmer). I've just dismantled a second 83-key PC/XT keyboard, which had an 8748 rather than an 8048 for a controller. That could be read without difficulty (If anyone wants the ROM image, PM me).Originally posted by modem7 View PostFor the PC/XT/AT, IBM has been extremely open with design details. It doesn't make sense to me that they'd hide the code in the PC/XT keyboard but publish or allow access to all other code. And a second document I've read on the 8048 doesn't indicate that code protection is available. If someone knows otherwise about the 8048, please chip in. Maybe the 8048 that you extracted was damaged.
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On the IBM PC/XT, there is a PROM at U44, a 82S129N, used for memory address decoding. This is a standard 256x4 PROM and should be easily readable by a programmer. Has anyone ever done so? It would be nice to have this dumped so someone could repair an XT motherboard if it goes bad or someone wants to recreate the XT.My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/
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I think I reconstructed it once based on the hi-mem U44-V2 documents. See this thread for a copy of the docs: http://www.vintage-computer.com/vcfo...read.php?28128Originally posted by Great Hierophant View PostOn the IBM PC/XT, there is a PROM at U44, a 82S129N, used for memory address decoding. This is a standard 256x4 PROM and should be easily readable by a programmer. Has anyone ever done so? It would be nice to have this dumped so someone could repair an XT motherboard if it goes bad or someone wants to recreate the XT.Last edited by per; November 26, 2013, 12:25 AM.Current systems owned by me:
Vintage:IBM PC/XT submodel 087 ( 1983 ), [Kon]tiki-100 rev. C (1983), Compaq Portable I ( 1984 ), IBM PC/XT submodel 078 ( 1985 ), IBM PC/XT286 ( ~1986 ), 3x Nintendo Entertainement Systems ( 1987 ).
Obsolete:Commodore A500 ( ~1990 ), IBM PS/2 model 70/386 type 8570-161 ( 1991 ), Atari Lynx II ( ~1992 ), Generic Intel 486SX PC ( ~1993 ), AT/T Globalyst Pentium w/FDIV bug MB ( 1994 ), Compaq 486DX4 laptop ( ~1995 ).
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Yes, that topic gave me the dump. Thanks for that.Originally posted by per View PostI think I reconstructed it once based on the hi-mem U44-V2 documents. See this thread for a copy of the docs: http://www.vintage-computer.com/vcfo...read.php?28128My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/
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The KANJI ROM of IBM JX is not dumped.Originally posted by Great Hierophant View PostOkay, after several contributions, I have what I believe to be the nearly complete set of IBM PC ROMs:
IBM PC 5150 BIOS & BASIC (5 Files Each, 40KB Total)
10/19/81
10/27/82
IBM Video (1 File Each)
IBM CGA/MDA FONT
IBM EGA BIOS
IBM VGA BIOS
IBM PC/XT 5160 BIOS & BASIC (2 Files Each, 64KB Total)
11/08/82 (Also IBM PC Portable 5155)
01/10/86
05/09/86
IBM PC AT 5170 BIOS & BASIC (2 Files Each, 64KB Total)
01/10/84
06/10/85
11/15/85
IBM PC/XT 286 5162 BIOS & BASIC (2 Files Each, 64KB Total)
04/21/86
IBM PC Convertible 5140 BIOS & BASIC (1 File Each, 64KB Total)
09/13/85 BIOS & BASIC
IBM PCjr. 4860 BIOS & BASIC (1 File Each, , 64KB Total)
06/01/83
IBM PC JX BIOS & BASIC (1 File Each, , 64KB Total)
03/15/85
I also have the Firmware ROMs for the PGC and the 3270 PC. All I am missing is the 4/24/81 PC BIOS.
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