Interrecord Gap
For cassette I O records, this consists of the Post-record Gap of a given record followed by the Pre-record Write Tone of the next record. Acronym for Input Output Control Block. There are eight of these whose function is to communicate between the user program and CIO. Maskable can be enabled or disabled by the 6502 interrupts such as the Break Key IRQ. The write-only register that contains the IRQ enable disable bits. IRQEN is shadowed at POKMSK. A primitive software hardware technique which...