"HP 9800" . "HP 9830 calculator" . "9830" . . "HP 9830A" . . . "HP 9845 Technical Desktop" . . . . "high performance language" . . . "HP 9800 series#9836A" . "HP 9800 series" . "HP 9800 series#HPL" . "Hewlett Packard" . "ROM cartridges to add BASIC commands for matrices" . . "HP 9830" . "HP 9800 series" . . "9800 series" .