I acquired a collection of older EPROM IC's and am wondering what the rarity of them are or if they are rather common. Do people collect these items?

  • 89142 NM27C512Q
  • ~~ B9212 NM27C512Q
  • ~~ B9312 NM27C512Q
  • ~~ B9224 NM27C512Q
  • ~~ B9318 NM27C512Q
  • ~~ B9130 NM27C512Q
  • A 8740 2716Q
  • Allen Bradley AM27C2048
  • AMD 2764ADC
  • AMD AM27C64
  • AMD AM27C64-20QDSB AM27C64-20ADSB
  • AMD 9232EP AM27C512-255DC
  • Fujitsu / Intel 8628 19 MBL8742H
  • Fujitsu / Intel MBL 8742H
  • Intel '80 8627P L8300363
  • Intel '80 8641P L6460221
  • Intel '80 8644P L6460220
  • Intel '80 8726P L7290058
  • Intel '80 8627P L6300365
  • Intel '82 D8742 L4255697
  • Intel '82 D8742 L5360036 / L6110132
  • Intel '82 8441 8441FDD
  • Intel '82 D8742 L4195392
  • Intel '82 DM742 L8130114 – 308262
  • Intersil 8201 IM64021PL
  • Intersil 7929 IM64021PL
  • Mitsubishi Elect Corp D8742
  • Motorola 8013 MCM2716C-35
  • Motorola 185-08
  • Motorola 185-09
  • Motorola 8448D XM SC81192L
  • Motorola 8504C XM SC81192L
  • NEC D8741AD
  • NEC D8302P9
  • NEC D8348PX
  • NEC D8321P9
  • NEC D8320P9
  • NEC D8352PX
  • NEC 595304A NM27C512Q
  • SEEQ 8450A 27128-25
  • SEEQ 0517 A 2764-20
  • STMicroelectronics 3210F
  • STMicroelectronics 10F 1 L / 9604
  • STMicroelectronics 9318 M27C4002
  • STMicroelectronics 9335S M27C4002
  • STMicroelectronics 10F I L 96004v5 MYS 88 530
  • STMicroelectronics 96004 V5 M27C 1001
  • STMicroelectronics 9335S M27C4002
  • STMicroelectronics M27C4002
  • STMicroelectronics 9340B M274002
  • STMicroelectronics 9340B M27C4002
  • STMicroelectronics 9G004 MYS 88 530
  • STMicroelectronics 9235 MC27C4002
  • STMicroelectronics 9301 MC27C4002
  • STMicroelectronics 9340B MC27C4002
  • STMicroelectronics 9335S M2732A-2FL
  • TMS JL 27c240-15 LP9245184
  • TMS JL 27c240-15 LP9245157
  • TMS JL 27c240-15 LP92451B4
  • Welcome to Retrocomputing Stack Exchange. Some parts of your question, such as the "common marketplace", are off-topic for this site, but other than that your question seems OK. – wizzwizz4 Oct 7 '17 at 7:21
  • 1
    Check cpu-world forum if you want to see some serious collectors... – rackandboneman Oct 11 '17 at 10:27
up vote 8 down vote accepted

Chip collectors I know are generally looking for a few things:

  • Early production dates — chips often have a date code of the form YYWW (eg 8651 for the 51st week of 1986). The earliest ones have more value to collectors.

  • Unusual technologies — if a chip used a short-lived or esoteric technology, it's generally considered more ‘interesting’.

  • Non-standard packaging — anything but DIP: mil-spec ceramics, piggybacks, Eastern Bloc rarities or regular chips in metal cans, …

  • Specific applications — At the hobbyist level, Commodore/MOS produced a lot of chips with non-standard pinouts, and these originals are now getting rarer. Industrially, there are many infrastructure/transit projects that run on 30+ year old systems. These may require one particular EPROM type for system modifications.

  • Provenance — if a chip or board comes with verifiable information where it was used (say aerospace, or motor racing) then it would have additional collector value. This might also apply if an EPROM contained a known early ROM version for a commercial computer.

EPROMs were usually produced in quantity, were designed to be interchangeable and used very standard technology. I'd say they were more useful than valuable, though UV-erasable EPROMs do have a certain visual appeal.

Your Answer

 

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.