Hi Jae,
use show invenrory here, and check the ASIC Rev column.
Note: A1 ASIC version is quite old.
Here is an example (but from a spectrum switch)
-- > show asic-version == switch firmware version!
# show asic-version
===================================================
Module Device Version
===================================================
MGMT SPC 13.350.410
# show inventory
---------------------------------------------------------------------------
Module Part Number Serial Number Asic Rev. HW Rev.
---------------------------------------------------------------------------
CHASSIS MSN2700-CS2F MT1605X10867 N/A A6
MGMT MSN2700-CS2F MT1605X10867 0 A6
FAN1 MTEF-FANF-A MT1605X09058 N/A A3
FAN2 MTEF-FANF-A MT1605X09057 N/A A3
FAN3 MTEF-FANF-A MT1605X09056 N/A A3
FAN4 MTEF-FANF-A MT1605X09055 N/A A3
PS1 MTEF-PSF-AC-A MT1605X11490 N/A A3
PS2 MTEF-PSF-AC-A MT1605X11488 N/A A3