GC208 - old marking, HT208 is new marking.
Palcal's cards:
(606) Headland Technology GC208-PC
(606) Headland Technology GC208-PC
(606) Headland Technology GC208-PC
(606) Headland Technology GC208-PC
(227) 650-0122-34 rev.1
(227) 650-0122-34 rev.1
(227) 650-0122-34 rev.1
(227) 650-0122-34 rev.1
(226) Siemens Nixdorf VGAPDC256
(226) Siemens Nixdorf VGAPDC256
(226) Siemens Nixdorf VGAPDC256
(226) Siemens Nixdorf VGAPDC256
Vlask's chip:
Siemens
Siemens
Siemens chips
Siemens chips