MIST0226/ZII-CONM5

 Mistigram: this #ANSIart #mainframe and its green terminal quietly ping from the bottom of the fallout shelter in the basement of Convolution BBS at convolutionbbs.org.  This #ANSIart screen was drawn by Zeus II and included in the new MIST0226 artpack collection.

MIST1121/BLIPPYPIXEL-IBM360

 Mistigram: @blippypixel has drawn this #BBCMicro animation of a #mainframe computer suite (and its 9-track vacuum column magnetic tape drives!) from the flexible #IBMSystem360 family of machines, sold for a bit over a decade starting in 1965.  This piece was included in the MIST1121 artpack collection.