Label (top):

CSG
65CE02-2
(C) (M) (C) CBM 1987, 88
1690 52

Where:

• CSG: Commodore Semiconductor Group
• CBM: Commodore Business Machines
• MOS has fallen out of the loop having been bought by Commodore

Label (bottom):

HONG KONG
HH125907
MP150SG

Approximate size: 4.4 x 3.7 mm

Text:

4502R2
Option 1
(M) 1988 CBM

Top metal @ Mit20x

• Single (12509×10688, 53 MB)

Etch 1-13 @ Mit20x

• Single (12442×10722, 59 MB)

Etch 1-16 @ Mit20x

• Single (12433×10684, 53 MB)

Sometime between etch16 and etch25 I believe a beaker contaminted with nitric was used. This caused unintentional staining of the chip as well as etching in some of the less pure areas of the chip causing pitting.

Etch 1-25 @ Mit20x

• Single (12416×10696, 45 MB)