It's a rather weird combination of year, CPU and memory.
Z80 is (still) an 8-bit CPU with 16-bit addressing. It cannot access more than 64kiB at a time. The hardware and the software needed to overcome that limit was worth more than an 8088/8086 (or compatible CPU) with MS-DOS and Telix.
In 1993,the age of 80286 and 80386, 8088/8086 were considered low-low-end CPUs, let alone the Z80, even in Mexico.
Z80 is (still) an 8-bit CPU with 16-bit addressing. It cannot access more than 64kiB at a time. The hardware and the software needed to overcome that limit was worth more than an 8088/8086 (or compatible CPU) with MS-DOS and Telix.
In 1993,the age of 80286 and 80386, 8088/8086 were considered low-low-end CPUs, let alone the Z80, even in Mexico.
Not pointing my finger, just stating some facts.