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collection mcmaster, vendor generalplus, type unknown, year unknown, foundry unknown

Sold as “70pcs Generalplus Micom GPLB52A24A 8bit MCU silicon dies wafer”

“1000/2000 Dots Mono/4-Gray-Level LCD Controller/Driver with 8-CH SPU”

SPU ⇒ sound processing unit

“The GPLB52A24A/GPLB51A24A, an 8-bit CMOS microprocessor, features 1536 bytes working RAM, 1M bytes ROM memory, 24 I/Os, interrupt/wakeup controller, two 16-bit timers, SPI interface, one 12-bit DAC, one 10-bit PWM, and automatic display controller/driver for mono/4-gray-level LCD”

Package

Die

GFI449
AU-3

MZ @ 20x

Single (10668×12192, 33.82MB)

Sample processing notes:

General
BOE: standard mix
- rgac50: 1 rg:1 hac
- All basically at 140F forced air vortexed
- Wash 3 times with distilled water between processes
s1
- s1-1: BOE 40 min
- ROM bits visible, although splotchy
- http://siliconpr0n.org/map/generalplus/gplb52a24a/s1-dlyr1_rom_ns100x_dic/
- http://siliconpr0n.org/map/generalplus/gplb52a24a/s1-dlyr1_rom_ns100x_dic/
s2
- Tries to replicate above without the splotchiness
- s2-1: BOE 10 min
- s2-2: barrier 3 min
- s2-3: phosphoric 3 min
- s2-4: BOE 5 min
- s2-5: barrier 5 min
- s2-6: phosphoric 5 min
- s2-7: BOE 5 min
- s2-8: phosphoric 5 min
- s2-9: barrier 5 min
- s2-10: BOE 5 min
- s2-11: barrier 5 min
- s2-12: phosphoric 5 min
- s2-13: BOE 5 min
- s2-14: barrier 5 min
- s2-15: phosphoric 5 min
s3
- 40 hours BOE
- Note: processed before s2
- Die is essentially destroyed
- http://siliconpr0n.org/map/generalplus/gplb52a24a/s3-dlyr1_mz_ns20x_dic/
s4, s5
- 2018-02-21: unstained
s8
- Started with 3:1 dilution of water:rgac
  - 6 mL H2O
  - 1 mL RG
  - 1 mL HAc
s09, s10, s11 all at the same time
- s09-1: rgac50, 24 min
  - dirty solution
  - pads and a few areas still coated
- s09-2: rgac50, 20 min
  - no significant changes
  - solution not dirty
- s09-3: boe, 20 min
- s09-4: boe, 20 min
- s09-5: boe, 22 min
- All 140F forced air