INMC 80 News

  

June/July/August 1980, Issue 1











Page 25 of 48











The program to drive the game replaces the code using the keyboard apart original coding.

exactly,

fr

om

the

delay routine which follows the end of the

The program executes from DOOH, starting with PIO initialisation and then jumping to the original program.

LOCATIONS

CA9-CCO

CC2-CD2 CD5-CE4

CE6-CFC DOD-D20 DOO-DOA D22-D4A FD2-FDE

In principle, The unit

) )

OCA9 OcB9 occ9 OCD9 OCE9 OCF9 Doo 0D10 0D20 0D30 0D40 0D50 OFD2

ROUTINE

MLOO

FIrRw 712

LEW

STAR REW SLOW

04 cD 77 CE 50 77 FF 77 87 03 20 FO 06

Pp

T

cB FO ci cD oc 00 D3 01 cD DD DD Fl 09

47 OE DD 76 FE 18 06 DD D2 7E 23 C3 cD

28 cD 36 0D 00 OF 3E 36 OF 01 3A 97 35

DESCRIPTION

Scans the switches, will allow firing of a missttle whilst moving left or right.

Fires a missile as per original program. Prevents more than one missile being fired for each key depression.

Move left, as per original program.

Initialises PIO; Starts program. Move right, as per original program. Controls speed of movement, by value at FD4

13 CB 4F 28 GF CB 57 28 2F CD 76 7A OF 18 E7 DD 7E 01 FE 19 20 0C 01 20 3£ 04 32 52 OC DB O4 CB 57 CD FO OE CD 7A OF 18 EF CD D2 OF 28 B9 DD 7E 00 DD 77 FF DD 7E 01

07 D3 06 D3 06 C3 24 OF DD 7E 02 02 20 DD 2B 3A 50 OC 3D 32 50 0C 3A 50 OC FE 2C 28 FR DD 7E 02 DD DD 77 02 DD 7E 00 DD 77 01 DD 36 50 0C 3C 18 D3 00 00 3A C6 OD FE OF

00 10 FB C1 CD 76 OD C9

the ideas given above can be adapted to suit many games.

makes

Space

Invasion much easier to play and saves wear and

tear on the keyboard when hitting the keys in the excitment of the

game.


This is an OCR’d version of the scanned page and likely contains recognition errors.











Page 25 of 48