Hard to find / expensive ICs

[EagleTG]

My votes:
UDN7180A (Display Chip, Alphanumerics)... Last one I saw was $40.00
Atari Slapstick chips (do customs even count for this thread?)

If Customs count, then the Williams Pinball ASIC chips are ridiculous:
http://www.marcospecialties.com/product.asp?ic=5410-14590-00
http://www.marcospecialties.com/product.asp?ic=5410-14705-00
http://www.marcospecialties.com/product.asp?ic=5410-12426-01

You can almost buy a complete new RottenDog board (if available for the intended purpose) for these prices.

 

[DarrenF]

Pokeys are in Atari 5200s

Pokeys can also be found in Atari 7800 Ballblazer and Commando carts.

Would any of those Pokey's happen to be socketed? Or am I looking at desoldering 'em?

 

[channelmanic]

Would any of those Pokey's happen to be socketed? Or am I looking at desoldering
'em?

5200s, yes... carts... no.

 

[Homepin]

You guys need to look a bit harder - WMS ASIC chip only AU$9.95 here:

http://www.pinballspareparts.com.au/index.php?search[terms]=asic&search[mode]=any

 

[yzoer]

Other than Jameco, check out:

www.unicornelectronics.com and www.futurlec.com (yes, that's without the 'e' at the end )

-Y

 

[G-P-E]

Other than Jameco, check out:

www.unicornelectronics.com and www.futurlec.com (yes, that's without the 'e' at the end )

-Y

Jameco... ok

But I bought from both of the other two quite awhile ago.
Unicorn is good if you want your parts tossed loose in a box with white (static) peanuts.
Futurlec -- They took my money, charged me foreign currency fees...and sent me nothing in return. No refund, no parts, no emails...nothing. Had to resort to getting money back by reversing credit card charges.

 

[ELutz]

Jameco... ok

But I bought from both of the other two quite awhile ago.
Unicorn is good if you want your parts tossed loose in a box with white (static) peanuts.
Futurlec -- They took my money, charged me foreign currency fees...and sent me nothing in return. No refund, no parts, no emails...nothing. Had to resort to getting money back by reversing credit card charges.

I use Unicorn (when I absolutely have to)......there's been several occasions where I had dead chips......right out of the tubes.

Edward

 

[channelmanic]

Futurlec -- They took my money, charged me foreign currency fees...and sent me nothing in return. No refund, no parts, no emails...nothing. Had to resort to getting money back by reversing credit card charges.

Futurlec took 3 months but finally shipped me some very hard to find chips. Just be patient.

 

[MajorHavoc]

For the LM379S, Big Daddy has the LM1875T listed as a replacement, but not sure that's a true drop-in replacement (?) See: http://www.bigdaddy-enterprises.com/electronics/e_ics.htm

It is not a drop-in replacement.

 

[DarrenF]

Regarding 6532 ("RIOT") ICs...

The "regular" (no suffix) 1MHz seems to be available from several sources.
Lucky for me, my current needs (Gottlieb Sys80 MPU & Sound PCBs) appear to run the clock under 1MHz (3.58/4 MHz) so the vanilla 6532 is fine.

Anyone aware of videogame/pinball boards that require the 6532A (2MHz) version? (which is rather harder to find).

 

[Riptor]

Franklin is right the LM1875 requires modification to work. You can make it work but its nowhere close to being considered a sub for the LM379S.

 

[channelmanic]

My votes:
UDN7180A (Display Chip, Alphanumerics)... Last one I saw was $40.00

I have to dig all my stuff out of storage and sort through it once the new shop is built. I think I have a stash of 20 to 30 of these if my memory isn't defective.

 

[VectorAddict]

6502B -- yes but equally rare.

It depends on who's 65C02 you are using.

The Rockwell 65C02 -- no.
The WDC 65C02 -- yes.

Incidently, the WDC 65C02 is -still- in production and can be bought directly from manufacturer.
And so are 65C21's (alternate for 6821) and 65C22's.

-- Ed

Can I drop in this WDC 65C02 part for a bad 6802B?:

http://tinyurl.com/74cwj77

The pinouts seem compatible, but the word "compatible" doesn't appear in their datasheet (and...why else would someone buy this chip?).

Thanks,
John

[edit: I found a spare, so I don't need one -- still good info for the group, I hope?]

 

[YellowDog]

[Hijacking the thread back to the original topic]

A couple more hard to find chips.

HA11244 - the IC on GO7s - Cheapest I have found is $4.35 each - http://www.ciconelectronics.com/ha11244.html

9316 - There are 4 of these on each Williams MPU board - I think I paid about $5 each for them the last time I found some. It looks like 74161s are workable substitutes, but I have to verify them in a working board. A 74HC161 tested correctly in a logic comparator.

ken

 

[KI4SWY]

this is from an atari list.

9301 -- 1 of 10 decoder, no alternate found (has oddball pin out)
9311 = 74154
9314 -- 4 bit latch, no alternate found (has oddball pin out)
9316 = 74161 (NOT the same as Bally's 9316 ROM's)
9321 = 74139
9322 = 74157
9334 = 74259

 

[jkoolpe]

How about the 74LS384 chips on Star Wars boards (Atari, vector)? The Star Wars manual lists these as 74LS384, but on the boards I have seen, the chip itself is labeled as "AM25LS14PAC."

I checked, and the only place I could find LS384 was on eBay from overseas sellers, and they were around $15 each.

Anyone know if there is a suitable replacement available or another source?

Jonathan

 

[KI4SWY]

Anybody try using these? maybe start a VHDL Library for un-obtainable logic chips?

http://www.fpgaarcade.com/ttl_replacement.htm

 

[DarrenF]

How about the 74LS384 chips on Star Wars boards (Atari, vector)? The Star Wars manual lists these as 74LS384, but on the boards I have seen, the chip itself is labeled as "AM25LS14PAC."

I checked, and the only place I could find LS384 was on eBay from overseas sellers, and they were around $15 each.

Anyone know if there is a suitable replacement available or another source?

Jonathan

Unicorn lists them: http://www.unicornelectronics.com/IC/74LS.html

 

[Riptor]

I have plenty of HA11244 but they are not cheap. I had LS384 but sold out, these appear to be scarce. I have a tube of 74161 and can get plenty more no problem.
Im going to look around and see if I can find the 384's again.

 

[jkoolpe]

I have plenty of HA11244 but they are not cheap. I had LS384 but sold out, these appear to be scarce. I have a tube of 74161 and can get plenty more no problem.
Im going to look around and see if I can find the 384's again.

Let me know if you find them. Unicorn does list them, but one has to buy 25+ minimum and I don't need that many. On the positive side, they only want about .99 each I'm tempted to buy that many anyway at that price (assuming that they really do have them and it's not a "legacy" type listing).

Ideally, I would just want a few as insurance if they were to fail in the future. One of my SW boards is on its way to elektronforge for repair of a matrix issue that I couldn't figure out myself (despite several hours working on it with my logic probe and o-scope)...and there are 2 LS384 chips in the "matrix" section of the board that could be the problem for all I know ...

Jonathan