ocr: 5. THE 7501 MICROFROCESSOR functions This of the section tyre 7501 describes some microProcessor. of the Properties and 5.1 7501 DESCRIFTION The 7501 ssecifically, is an the HHOS 6510CBM. version The of the 7501 6502 is sortware family or more compatible with existing 6502, 6510 code. used The Tho recister to Port 7501 is is directly at contains at $0001, a location drive 7 The bit the $0000 7501 serial is while bi-directional bus the and Tri-statable data port cassette. and direction the DMA and Fead lire write Write (GATE throush is is line IN) Czle state celled used transistion use to from ...
