Inferno (Joust 2) Schems

Reava

Member

Donor 2020
Joined
Feb 26, 2010
Messages
73
Reaction score
10
Location
Near Portsmouth, West Sussex, United Kingdom
Hi, whilst reading another thread I found a link to a Williams Inferno manual I didnt know existed - with schematics!!!

As I'm trying to repair my Joust 2 at the moment, I'm just wondering if anyone on here has the original manual would be able to rescan a better quality file for me just of the schematics - I'd be most grateful!!!!


Cheers Rav
 
As far as I have been able to determine, the schematics from Joust 2 were never published. I don't know if that was a deliberate act by Williams or was just an oversight. That being said, the Inferno and Joust 2 boards are supposed to be the same, with some minor adjustments. So the schematics should work from one to the other for the most part.

There are a couple of documents (probably from the same original source) that I have found that detail the directions for converting a Joust 2 board set to an Inferno boards set. It seems pretty straightforward.

ken
 
Yeah, I didnt think there was joust 2 schems - but then until today i didn tthink there was inferno schems either!!

it clarly shows two customs where the 6 74198s were but much more than what they do... but the pdf is too bad to read in that particular part...

Be interested to see that joust 2->inferno and keep that on file seeing I have both machines :)

Spent hours on this 101 ram error but cant find whats causing it yet. Thanks for your suggestions already - the blitters are on the other pcb. If I pull 101 and turn on it says 198 (i.e. ic98) but ive looked and looked and looked and tested the socket so I'm positive its ok... Grr
 
The RAM chips are numbered differently on the gen 3 boards.

The chip in the upper right corner used to be chip 11 (bank 1 chip 1) and the chip in the lower left corner used to be chip 38 (bank 3 chip 8).

So chip 101 is Bank 1 chip 4. If you pulled what used to be chip 1, you just pulled chip 98 (hence the error message). Use the diagram below for the new chip layout.

Code:
[FONT=Courier New]+---------------------------------+ +--------[/FONT]
[FONT=Courier New]| Video RAM BD                    | | CPU ROM BD[/FONT]
|                                 | |
|                                 | |
|                                 |-|
|                                 |-|
|                                 |-|
|                                 |-|
|    RAM BANKS                    |-|
|                                 |-|
|    114 106 098                  | |
[FONT=Courier New]|    115 107 099                  | |[/FONT]
[FONT=Courier New]|    116 108 100                  | |[/FONT]
[FONT=Courier New]|    117 109 101<                 | |[/FONT]
[FONT=Courier New]|    118 110 102                  | |[/FONT]
[FONT=Courier New]|    119 111 103                  | |[/FONT]
[FONT=Courier New]|    120 112 104                  | |[/FONT]
[FONT=Courier New]|    121 113 105                  | |[/FONT]
[FONT=Courier New]+---------------------------------+ +--------[/FONT]

Hope this helps.

ken
 
Did you ever resolve your error 101?
We have the same issue, replaced the socket and all the RAM and still have the error.

Greatly appreciate any guidance, thank you.
 
Bumping this thread to find out if anyone has found an updated scan of the Inferno schematics. I am in need of them to fix my Joust 2. Does anyone have an Inferno Manual w/ schematics? I've have the scan that has been available for quite a while and frankly, they're very difficult to read. I know the Turkey Shoot schematics are much better and looks like they can be used for the CPU board. But, the Video Board on Joust 2 and Inferno have custom chips that are not reflected in the Turkey Shoot schematics.
 
While waiting for parts for my Joust 2, I had some time on my hands. Got sick of looking at bad, difficult to read schematics. So... I decided to recreate them w/ modern tools. I have remade the Joust 2, CPU 2 of 2 schematic. Having to use the terrible Inferno and Turkey Shoot scans, it's been a challenge. I've tried to keep close to the original but found some better net routes, corrected a few errors, and adjusted the board differences (at least the ones that I've found). I'm going to attempt the CPU 1 of 2 next, but may not be able to complete the video board w/o legible Inferno schematics. Putting out a plea to help the community. If anyone has the Inferno schematics, could you please share so I can try to create a complete Joust 2 schematic set.

j2schem.jpg
 
@FricFrac (who I don't think is active anymore) is stated on VAPS to have an original Inferno manual (and therefore the schematics)... I haven't been able to get in touch with him - I've tried.
 
I had to fix Turkey Shoot and Joust 2 years ago without this information. it was pretty abysmal. mostly what inspired me to get out of fixing those completely.
 
I shot a message to ebay seller Gizmorama to see if they have them in their archives. They have an astonishing array of obscure manual & schematics going back many decades. They don't have either currently listed https://www.ebay.com/str/gizmorama
 
I shot a message to ebay seller Gizmorama to see if they have them in their archives. They have an astonishing array of obscure manual & schematics going back many decades. They don't have either currently listed https://www.ebay.com/str/gizmorama
I spoke to them on the phone a couple months ago asking about it. They didn't have any of that generation Williams manuals except for a Star Rider set IIRC.

Wish they did, I was looking for a good inferno scan for a while.
 
Find attached...

~Brad
This is the one on the Internet archive right?

The main manual is fine, but the schematics are basically illegible is the problem. I wonder what happened.
 
I spoke to them on the phone a couple months ago asking about it. They didn't have any of that generation Williams manuals except for a Star Rider set IIRC.

Wish they did, I was looking for a good inferno scan for a while.
Damn, they've got such an array, I was hopeful. Good luck on the hunt. One will pop up somewhere.
 
Damn, they've got such an array, I was hopeful. Good luck on the hunt. One will pop up somewhere.
They do have some awesome stuff. I bought a whole bunch of other manuals from them.
 
I had to fix Turkey Shoot and Joust 2 years ago without this information. it was pretty abysmal. mostly what inspired me to get out of fixing those completely.
Yeah, having a tough time with this one myself.

Find attached...

~Brad
Thanks Brad, but these are the ones I'm working off of. The CPU #2 is completely unreadable. Inferno is the closest match to Joust 2 so certainly the best option. I have to work off the Turkey Shoot schematics for now just for legibility. They are close, but there are differences. When it comes to the video board, they used 2 50+ pin custom chips. The Turkey Shoot and Mystic Marathon doesn't have those chips and the Inferno schematics that I have, I can't read what the I/O lines are labeled or what some of the pin numbers are. That's where the ole' DMM comes in the to check continuity. Just going to take a while.

Even though the board is slightly different from Joust 2/Turkey Shoot, here's a link to the Mystic Marathon schematics: https://arcarc.xmission.com/PDF_Arc...hon_Drawing_Set_(16-3008-103)_May_15_1984.pdf
Wow, these are fantastic scans. I should be able to get through the CPU board with these schematics. At least these are legible. There are some differences, but this will take care of 90% of the CPU board. Thanks. The video board is going to be the challenge. They replaced some of the chips with 50+ pin customs... (See above) LOL

@64B1T: Thank you for your efforts. Despite them not panning out, every bit of help is greatly appreciated.


Thank you all for trying and helping out. Unfortunately, I have to use KiCad to do this and I'm not familiar with all the functions. I usually use DipTrace, although I only have the hobbyist license and that limits me to 500 pins. It's a lot easier to use, looks better and I like the interface more. It does have some library limitations. But, in order to recreate these schematics, I've found I have to make my own part symbols anyways to match the symbols they originally used. KiCad is easy enough to figure out the basics. I'm having trouble understanding how they do nets and I don't like the way it does the labels. I'm only interested in making the schematics and exporting them as PDFs, so I don't care about the nets. Not like I'm going to have a PCB manufactured. When I'm done and someone wants to edit the nets and have fully linked nets or want PCBs made, by all means, I'd share the KiCad files.

P.S. The image I supplied in an earlier post is certainly not the high resolution of what I'm working with. That was just a quick screen shot for display purposes only. :)
 
Bit of a necrobump.

I got ahold of an original manual and schematic set and scanned it. The quality of the original material isn't all that great - Williams definitely used a photocopier for this.... But it anyone needs detail of anything specific let me know and I'll be happy to get it.
 
Back
Top Bottom