Defence Force Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

Memory areas are different depending on whether the system is in HIRES or TEXT modes.





===== BASIC Text Memory Map =====
^Address^Name^
|0000-00FF|Page Zero|
|0100-01FF|Stack|
|0200-02FF|Page 2|
|0300-03FF|[[#Page 3 (I/O)|I/O Area]]|
|0400-04FF|Sedoric Code|
|0500-B3FF|BASIC Program RAM|
|A000-BFDF|HIRES Screen|
|B400-B4FF|**Spare Memory**|
|B500-B7FF|Standard Character Set|
|B800-B8FF|**Spare Memory**|
|B900-BB7F|Alternate Character Set|
|BB80-BF3F|TEXT Screen|
|BF40-BF67|**Spare Memory**|
|BF68-BFDF|TEXT Bottom Screen|
|BFE0-BFFF|**Spare Memory**|
|C000-FFFF|ROM / Overlay RAM|

===== Page 0 (Page Zero) =====
Locations not used by BASIC
^Address Range^Notes^
|00-0B| |
|BB-BC| |
|F3-F9| |





===== Page 3 (I/O) =====
^Memory Range^Device^
|0300-030F|Internal VIA 6522|
|0310-0310|DK'tronics Joystick Interface (left port)|
|0310-0313|Microdisc FDC WD1793|
|0310-031F|Pravetz FDC|
|0314-031B|Microdisc additionnal I/O registers|
|031C-031F|Internal ACIA 6551 (Telestrat)|
|0320-032F|RS232 extension (Atmos)|
|0320-0320|DK'tronics Joystick Interface (right port)|
|0320-032F|Second VIA 6522 (Telestrat)|
|0320-03FF|Pravetz ROM|
|0330-035F|**Spare Memory**|
|0360-0371|RTC ICM7170 (Telestrat and Atmos)|
|0380-03DF|**Spare Memory**|
|03E0-03E1|Oric Lightpen|
|03E2-03F3|**Spare Memory**|
|03F4-03FF|Jasmin FDC WD1773|

Other references: [[http://passionoric.free.fr/eng/oric.htm#IO|Passion ORIC]]
===== CPU vectors =====
^Memory location^Vector^
|FFFA-FFFB|NMI 6502 Vector|
|FFFC-FFFD|Reset 6502 Vector|
|FFFE-FFFF|IRQ 6502 Vector|

Defence Force Wiki

User Tools

Site Tools

Page Tools