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Burroughs TD830 (Firmware ROM Type)

Joined
Nov 29, 2021
Messages
31
Location
Switzerland
Hello,

I am looking for information on firmware for the Burroughs TD830 terminal. I am trying to identify the ROM type : 9316B is clear, but for C28130 & CN7046, I have no idea/
 

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It is in the same array so it is probably something similar.
The issue may be that the chip selects are programmable wrt being active high or low.

another terminal was dumped, but the dump doesn't work correctly when someone from the
MAME team tried to run it



I've located a technical manual but I have been unable to reach anyone in Italy who will
reply to me about it.
items
983 AA.VV. DOCUMENTATION PACKAGE - BURROUGHS MACH. LTD. 79/76 U.K. 14/05/98 DONO BURROUGHS EN
984 AA.VV. DOCUMENTATION PACKAGE-BURROUGHS MACH. LTD. 78/80 U.K. 14/05/98 DONO BURROUGHS EN
985 AA.VV. TP31X/323 JOURNAL PRINTERS - BURROUGHS - TEST AND FIELD DOC. + ALTR 79/81 U.S.A. 14/05/98 DONO BURROUGHS EN
986 AA.VV. BURROUGHS ITALIANA S.P.A. - ISTRUZIONI VARIE 14/05/98 DONO EN
987 AA.VV. MT983/993 DISPLAY TERMINALS - TEST AND FIELD DOC. - BURROUGHS Jan-79 U.S.A. 14/05/98 DONO BURROUGHS EN
988 AA.VV. MT983/993 DISPLAY TEST AND FIELD DOCUMENTATION 79/80 U.S.A. 14/05/98 DONO BURROUGHS EN
989 AA.VV. MT983/993 DISPLAY TEST AND FIELD DOCUMENTATION Jan-80 U.S.A. 14/05/98 DONO BURROUGHS EN
990 AA.VV. TP130 - TP133 - TP138 - ALPHA NUMERIC KEYBOARD - F. D. 78/80 U.S.A. 14/05/98 DONO BURROUGHS EN
991 AA.VV. TP110 SERIES ALPHA NUMERIC KEYBOARD - F. D. Jan-79 U.S.A. 14/05/98 DONO BURROUGHS EN
992 AA.VV. DOCUMENTATION PACKAGE - BURROUGHS MACH. LTD - 31800428 BD2-20 PROCE Jan-80 U.S.A. 14/05/98 DONO BURROUGHS EN
993 AA.VV. T&F MODULE FOR THE UNIVERSAL SD2 ASSEMBLY - BURROUGHS Jan-82 U.S.A. 14/05/98 DONO BURROUGHS EN
 
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I could read all the 9316B as 2716s. For the other chip I need to trace the chip select pin to see were they all go to and which pin number they are. I have three terminals and two are almost working, but I want to replace the old ROMs with newer and full firmware too
 
I would be interested in archiving any rom dumps you make. Please jot down the xxxx-xxxx rom part numbers too
I notice that some of the roms are in different sockets between what I have and the boards that you have.

Do you have a system that you can use the terminals on?
 
Hello,

Here are the three CPU boards I have used and all three allow data entry with a terminal unit. Of course there are issues. Only 17 lines are shown and the remainder of the 25 is outside the screen view. Keyboard works and shows no error leds.

I have repaired all three power supplier and they work on all three terminals. One display board is not working properly and the same for the two communication boards. Basically one units is fully functional. The second unit does work but shows 40 columns data. My goal is the update all the ROMS.

Does you have a running system?
 

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Interesting, every board has a different ROM set.
There are more rom/rams than could fit in the processor adr space, I wonder if that small prom near
the CPU is used for address mapping.

The Computer History Museum has a B1955, but I have not been able to locate its console CRT so far.

we may need to create a simulation if I can't locate one.
 
I was mistaken about how much memory the terminal has.
The memory map is here. It is also obvious why the roms are grouped in
two blocks.

The TD83x series was available in many different configurations with additional
peripherals as options.
 

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here is a skeleton MAME driver for the terminal that currently doesn't do much
 

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As it happens I acquired one of these terminals yesterday, a TD833 with a REV D CPU board. My initial attempts to dump the ROMs were unsuccessful however I understand where I went wrong and am in the process of making an adaptor so I can read the AM9218s as a 27128, effectively mapping the three CS pins to A11, A12, and A13.

The way the ROMs are generally wired can be seen in the image below.
ROM Layout.png
The address lines and CS lines are common to all ROMs
The 16 ROMs are in two groups of 8 each with a data bus each, a bus is selected via the CPU using some N8T97N (tri-state).
I don't know where the CS lines are derived, however, they can't be directly mapped from the address bus as there is insufficient address space.

Incidentally, it would happen that my power supply is also not working, any load on the 5V rail, and the power supply shutdowns. Cliff if you could possibly provide me with a list of voltages and their location I would appreciate that greatly. I have seen 5v 20v -21V however I don't know if there are more. One of the 5v regulators looks to be shorted to ground too, or perhaps it's just off.

Here is a table of the ROMs this system has.
SlotChipMAKS label
1
2
3AM9218BCC2641-4904
4CN7640F2641-4912
5AM9218BCC2641-9465
6CN72142639-6838
7CN7215F2639-6853
8CN7216F2639-6861
9
10
11CN7217F2639-6879
12CN7642F2641-4938
13AM9218BCC2641-4946
14C481432641-4953
15C481442641-4961
16CN7792F2641-4979


Here is a link to some of the information have gathered
 

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As it happens I acquired one of these terminals yesterday, a TD833 with a REV D CPU board. My initial attempts to dump the ROMs were unsuccessful however I understand where I went wrong and am in the process of making an adaptor so I can read the AM9218s as a 27128, effectively mapping the three CS pins to A11, A12, and A13.

The way the ROMs are generally wired can be seen in the image below.
View attachment 1258464
The address lines and CS lines are common to all ROMs
The 16 ROMs are in two groups of 8 each with a data bus each, a bus is selected via the CPU using some N8T97N (tri-state).
I don't know where the CS lines are derived, however, they can't be directly mapped from the address bus as there is insufficient address space.

Incidentally, it would happen that my power supply is also not working, any load on the 5V rail, and the power supply shutdowns. Cliff if you could possibly provide me with a list of voltages and their location I would appreciate that greatly. I have seen 5v 20v -21V however I don't know if there are more. One of the 5v regulators looks to be shorted to ground too, or perhaps it's just off.

Here is a table of the ROMs this system has.
SlotChipMAKS label
1
2
3AM9218BCC2641-4904
4CN7640F2641-4912
5AM9218BCC2641-9465
6CN72142639-6838
7CN7215F2639-6853
8CN7216F2639-6861
9
10
11CN7217F2639-6879
12CN7642F2641-4938
13AM9218BCC2641-4946
14C481432641-4953
15C481442641-4961
16CN7792F2641-4979


Here is a link to some of the information have gathered
Hello,

Indeed that will work. Reading the AM9218s individually does not need any CS.
 
As it happens I acquired one of these terminals yesterday, a TD833 with a REV D CPU board. My initial attempts to dump the ROMs were unsuccessful however I understand where I went wrong and am in the process of making an adaptor so I can read the AM9218s as a 27128, effectively mapping the three CS pins to A11, A12, and A13.

The way the ROMs are generally wired can be seen in the image below.
View attachment 1258464
The address lines and CS lines are common to all ROMs
The 16 ROMs are in two groups of 8 each with a data bus each, a bus is selected via the CPU using some N8T97N (tri-state).
I don't know where the CS lines are derived, however, they can't be directly mapped from the address bus as there is insufficient address space.

Incidentally, it would happen that my power supply is also not working, any load on the 5V rail, and the power supply shutdowns. Cliff if you could possibly provide me with a list of voltages and their location I would appreciate that greatly. I have seen 5v 20v -21V however I don't know if there are more. One of the 5v regulators looks to be shorted to ground too, or perhaps it's just off.

Here is a table of the ROMs this system has.
SlotChipMAKS label
1
2
3AM9218BCC2641-4904
4CN7640F2641-4912
5AM9218BCC2641-9465
6CN72142639-6838
7CN7215F2639-6853
8CN7216F2639-6861
9
10
11CN7217F2639-6879
12CN7642F2641-4938
13AM9218BCC2641-4946
14C481432641-4953
15C481442641-4961
16CN7792F2641-4979


Here is a link to some of the information have gathered
BTW I noticed that the ROMS 5V power rail is also seperated (they do not share the same 5V power rail, it is connected to IC SSD1927).
 
As it happens I acquired one of these terminals yesterday, a TD833 with a REV D CPU board. My initial attempts to dump the ROMs were unsuccessful however I understand where I went wrong and am in the process of making an adaptor so I can read the AM9218s as a 27128, effectively mapping the three CS pins to A11, A12, and A13.

The way the ROMs are generally wired can be seen in the image below.
View attachment 1258464
The address lines and CS lines are common to all ROMs
The 16 ROMs are in two groups of 8 each with a data bus each, a bus is selected via the CPU using some N8T97N (tri-state).
I don't know where the CS lines are derived, however, they can't be directly mapped from the address bus as there is insufficient address space.

Incidentally, it would happen that my power supply is also not working, any load on the 5V rail, and the power supply shutdowns. Cliff if you could possibly provide me with a list of voltages and their location I would appreciate that greatly. I have seen 5v 20v -21V however I don't know if there are more. One of the 5v regulators looks to be shorted to ground too, or perhaps it's just off.

Here is a table of the ROMs this system has.
SlotChipMAKS label
1
2
3AM9218BCC2641-4904
4CN7640F2641-4912
5AM9218BCC2641-9465
6CN72142639-6838
7CN7215F2639-6853
8CN7216F2639-6861
9
10
11CN7217F2639-6879
12CN7642F2641-4938
13AM9218BCC2641-4946
14C481432641-4953
15C481442641-4961
16CN7792F2641-4979


Here is a link to some of the information have gathered
Sure. I will check the power supply voltages
 
Those Rom dumps you provided previously, I could convert into Binarieswhich is readable with a programmer (I use the TL866II_Plus). Would be interesting to catalog them to their given ROM numbers.
B1 I could associate with 2639-4213A (Exact same).
 

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It is back alive again after 74116 on video board went south. There are still more issues. With proper set of ROMs it will become clearer.
 

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Cliff, would you make your rom dumps available?
I made a table of rom part numbers from the three cpu boards over the weekend
it is at http://bitsavers.org/pdf/burroughs/Terminal/TD83x/TD831_CPU_bds/romlist.txt

Someone offered to send me a box of Burroughs service microfiche, hopefully more
terminal information will be in there.



Also, I am REALLY curious where that image on the screen came from.
Do you have a running Burroughs system?
 
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Cliff, would you make your rom dumps available?
I made a table of rom part numbers from the three cpu boards over the weekend
it is at http://bitsavers.org/pdf/burroughs/Terminal/TD83x/TD831_CPU_bds/romlist.txt

Someone offered to send me a box of Burroughs service microfiche, hopefully more
terminal information will be in there.



Also, I am REALLY curious where that image on the screen came from.
Do you have a running Burroughs system?
Hello there,

Yes I have three of these terminals. The picture with the image I made myself just to test the keyboard and CRT. So one is working in a way. All three have working power supplies and CRTs. The power supplies were serviced and recaped too. The three CPU boards work too with new RAM chips. Two video and communication PCB work too. About the ROM dumps, I will use your circuit so I can dump my Am9218s too. That is great news to access microfiches for more knowledge on parts.
 
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