(Topic ID: 222797)

NEW! Williams System 3-7 In-Game Test ROMs


By pincoder

9 months ago



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  • 163 posts
  • 26 Pinsiders participating
  • Latest reply 4 days ago by SYS6
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There are 163 posts in this topic. You are on page 4 of 4.
#151 5 days ago

Sorry for the dumb question but to clarify my understanding when I am planning to test system 7 boards that are set up for ic17 as a 2532 I use the 4k files in an adapter board with a 128k eeprom, (4k individual test size x 32 tests = 128k, even though tests 23 to 31 are empty). A0 to A11 go from test eeprom to the mpu board, A12 to A15 are used to select the test via dips.

What is the suggested 128k eeprom to use? Thanks for the help or clarification.

#152 5 days ago

No hook a0 to a11 to their corresponding pins(correct), then a12 to a16 (5 pos dip) to the dips. You need a 5 pos dip for 32 slots

#153 5 days ago

Use what ever 128k you can find. find the data sheet that is relevent to that chip. I had trouble finding a 64k
. It will be somthing like 28c1024 or 27c1024

#154 5 days ago

Sorry was just looking at the data sheet for a 27c1024. they are 16x64kbit 16 address pins(including a0). So will only break down in to 8K(64kbit)chunks. That is in a 4k slot. I believe it will break down in to 32 in a 2k

#155 4 days ago

Common 128kbit 128k Byte EPROMs are 27C010 and 27C1001 - these are same pinout, note these are 32 pin parts.
The Winbond W27C010 is an EEPROM (electrically erasable).

#156 4 days ago

They need 128kbyte

#157 4 days ago

Sorry, that's a typo in my previous post - 27C010 and 27C1001 are 128k Byte parts.

#158 4 days ago

Ok W27C010 looks like a go, 17 address lines. Havent personally tried this, but from my understanding this should work.

#159 4 days ago
Quoted from Nusilor:

Sorry was just looking at the data sheet for a 27c1024. they are 16x64kbit 16 address pins(including a0). So will only break down in to 8K(64kbit)chunks. That is in a 4k slot. I believe it will break down in to 32 in a 2k

In choosing a chip, you should stick to 8 bit chips (Chips with D0-D8) as using higher width chips such as 16 bit chips (D0-D15) will be wasteful, in terms of usable storage. Remember, this era of pinball machines are only 8 bits wide and so the excess data pins on the wider chip will go unused.

You also need to think about timing/response time and handshaking signals of the chip you choose. They must match the 2716 and 2732 chip specification and be at least as fast as that.

No matter the size of the chip, they will always break down into 2K chunks using A0-A10. 4K chunks would need A0-A11. 8K chunks A0-A12, etc. Any extra address lines on the chip you choose should each be routed (in order) to a DIP switch.

The bigger the chip, the more chunks you get. System 7 boards (in system 7 mode) need 4K chunks. A system 7 board in system 6 or earlier mode will need 2K chunks. System 6,4,3 also need 2K chunks.

For those that don't quite know how to decide, I'm likely going with an SST39SF040 (512k x 8 bits) when I do start putting some pre-programmed adapter boards up for sale. In the mean time, if you decide on a different chip that works please feel free to chime in, and post your design for others if you like.

SST39SF0x0 (resized).png

Here's where you can get the 39SF040 from digikey (digikey part# SST39SF040-70-4C-PHE-ND) in Canada:

https://www.digikey.ca/products/en/integrated-circuits-ics/memory/774?k=sst39sf040&k=&pkeyword=sst39sf040&sv=0&pv1291=3756&sf=0&FV=ffe00306&quantity=&ColumnSort=0&page=1&pageSize=25

Don't forget to use a chip that your chip programmer supports, and use a socket on your adapter board - you'll need to quickly remove the chip to program it with newer versions of ROMs HINT: Make your life easy and use a ZIF socket!

#160 4 days ago

Yeah that was basically what i was trying to say, you done a way better job . Old mate still will still need a w27c010 for a 4k machine if he wants 32 slots.

#161 4 days ago

Hey, with 17 address lines in a 2k machine wont that break down in to 1k chunks. That is the
SST39SF040

#162 4 days ago

Nm its a 4mb chip and has 19 address lines. I suppose this is the go then. Many lols, 256 slots for 2k and 128 for 4

#163 4 days ago

Thanks all for the comments and clarifications.

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