(Topic ID: 304434)

ROM sizes and types for Hyperball (Williams system 7)

By Zigzagzag

6 months ago


Topic Heartbeat

Topic Stats

  • 11 posts
  • 3 Pinsiders participating
  • Latest reply 5 months ago by Zigzagzag
  • No one calls this topic a favorite

You

Linked Games

#1 6 months ago

I am currently restoring a Hyperball and am a bit confused about the ROM types and sizes on the accompanying Williams system 7 MPU board.

I would like to update to ROM L6 for U20 (game ROM 0) with accompanying ROM L4 for U14 (game ROM 1) and U17 (game ROM 2).

I have modified the board to use 2732 EPROMs for Leons test ROM at U17, so that part is ok.

The schematics states that U14 and U20 should be 2316 type ROMs with 16384 bits/2kbytes capacity.
The L4 ROMs found on IPDB however are 32768 bits/4kbytes in size however.
Does this mean the board can be jumpered/changed to accept 2732 EPROMs in all positions ?

Also, Pinwiki states that Hyperball uses standard blue flipper roms : https://pinwiki.com/wiki/index.php?title=Williams_System_3_-_7#Flipper_ROMs
Planetary pinball however indicates they use a separate type : http://www.planetarypinball.com/mm5/Williams/tech/checksum7.html

#2 6 months ago

Hyperball is 3x2532 roms. I don't think it's easy to modify the system 7 board to use 2732's in all 3 positions though, it's actually what spurred me to acquire the 2532 eproms (and build an accompanying adapter for the tl866) as I needed to burn this for a project that needed the largest romspace available on system 7.

That's not to say it couldn't be done (you certainly could jumper for 3x2532 and put adapters on the eproms themselves to use 2732's) - but the factory jumpers don't have the 2732x3 config.

#3 6 months ago
Quoted from slochar:

Hyperball is 3x2532 roms. I don't think it's easy to modify the system 7 board to use 2732's in all 3 positions though, it's actually what spurred me to acquire the 2532 eproms (and build an accompanying adapter for the tl866) as I needed to burn this for a project that needed the largest romspace available on system 7.
That's not to say it couldn't be done (you certainly could jumper for 3x2532 and put adapters on the eproms themselves to use 2732's) - but the factory jumpers don't have the 2732x3 config.

Ok, thanks, I'll consider my options

#4 6 months ago

A11 is at a different pin 2532 vs 2732. No jumpers exist on the to shuffle these around so you would be cutting and jumping tracks.

#5 6 months ago
Quoted from barakandl:

A11 is at a different pin 2532 vs 2732. No jumpers exist on the to shuffle these around so you would be cutting and jumping tracks.

Yep, or making an adaptor board I guess.

#7 6 months ago

That's (and others from that site) are on my list of things to get and try. My stock of 2532/2732 are dwindling ... I guess I can't expect 40 year old eproms to be able to erase and reburn continuously, after all. Time to get adapters to go into my 30 year old 128 and 256 chips.

#9 6 months ago

I <3 EEPROMs. I bought a TOP3000 just to do MX29F1615. UV erasing sucks. W27C512 is my favorite DIP28. They made a 2Mbit W27C020 one a well... too bad no 8M DIP32 EEPROM is common.

Consider doing a stack of 2-3 IC sockets to get the pin out adjustment you want. That way you don't need to hack on the board or buy adapters.

#10 6 months ago
Quoted from barakandl:

UV erasing sucks. W27C512 is my favorite DIP28. They made a 2Mbit W27C020 one a well... too bad no 8M DIP32 EEPROM is common.

Yeah, no kidding. And I have the BK precision one that does like 40 at a time. Since going to the 512 eeprom I've been using those exclusively even when I'm putting it in a 128 or 256.... after I'm through hacking around I might burn it onto the eprom to get the 512 back. I have had a couple of the 512's go bad but when I say reuse.... I mean 100's of times. For flight 2000 I know I burned at least 1000 versions tweaking it, so those 512's got a real workout.

I would love adapter boards that fit into the original mpu's (system 11/9) that replace the 2 eproms with 1 512.... I played around with this a little bit but because my hardware skills suck, it didn't work. Should have been pretty straightforward I'd thought, using the existing chip enables on u26/27 into a gate to select the 512 on the adapter board, but nope.... no go.

Ditto with a system 7 kahout board, obviously something I'm missing. Only thing I've been able to do is hack the siegecraft system 6 adapter to work on bally/stern boards but your replacement mpu eliminated me requiring that.

2 weeks later
#11 5 months ago

Doing the same modifications on the board for U14 and U20 as is done for placing a 2732 in U17 seems to do the trick.
At least the board is booting now

Promoted items from the Pinside Marketplace
$ 9.95
Eproms
Pinballrom
From: $ 9.00
$ 27.95
Eproms
Pinballrom
From: $ 77.00
Tools
Pincoder Store
$ 17.00
From: $ 18.00
Apparel - Men
Pinside Shop

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, become a Pinside+ member!