These two single-page specsheets and the letter came as one bundle in a Holland Computer Import binder
They made (or assembled) their own clone computers of which the two specsheets are two types
Below the binder, then the letter and after that the two sheets.

The letter

The two sheets

Title : De nieuwe HCI 286: betaalbare Perfectie
Publisher : Holland Computer Import
Language : Dutch
Year : 198?
Subject : HCI 286

Title : De nieuwe HCI 386: betaalbare Perfectie
Publisher : Holland Computer Import
Language : Dutch
Year : 198?
Subject : HCI 386