Can you identify these old (late 70s / mid 80s) chips?

[SaabFAN]

I just got a bunch of chips that came with a 8279 Display-/Keyboard-Controller I needed for a repair.
Aside from a few 2k and 64k SRAMs, there also were several other chips, of which I've been unable to identify a few. I hope you can help:

- 33512DC = 9bit FIFO ?
- 809 v L6621 / 7219-0629 / 211003-02 = <- Haven't been able to find anything with any of these numbers. Custom-Chip maybe?
- D855D  =
- SAB1792 =
- µPD757C = 4bit Microcontroller?

[bktemp]

- D855D  =
- SAB1792 =

If google finds nothing at all, the numbers are most likely wrong:
D855D -> U855D (Z80 PIO)
SAB1792 -> SAB1797-02P (Floppy Disk Controller)

[amyk]

3351-2 datasheet is in here: http://bitsavers.trailing-edge.com/pdf/fairchild/_dataBooks/1975_Fairchild_MOS_CCD_Data_Book.pdf

SAB1797 is a FDC: http://www.datasheetspdf.com/PDF/SAB1797/554206/1

7219-0629 is a VLSI Technology ASIC, can't seem to find anything else on it either

µPD757C is a mask ROM microcontroller of some sort, probably custom for some other company because I can't find anything else on it.

[ChristofferB]

U880 by "FWE" is a DDR z80 clone, so 855 is very likely a z80 family chip. +1

[SeanB]

NEC did a lot of mask ROM microprocessors, mostly a Z80 and some built in peripherals, like the UART, RIOT and PIA along with some RAm as well. They generally were custom made for customers like calculator and copier manufacturers, and a lot were used in dot matrix and old thermal printers.

Going to guess the 855 is a cloned 8255 PIA chip.