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A> AMSTRAD "JOYCE" SOFTWARE INTERFACE SPEC.

Internal documentation from Amstrad, detailing the software interface specifications of the Amstrad PCW.

               AMSTRAD "JOYCE" SOFTWARE INTERFACE SPEC.
                        Issue 9   9 July 1985
               (OCR'd by Cliff Lawson, 8th June 1997)

1. INTRODUCTION
Defines the Z80 software interface for the Amstrad "JOYCE" (PCW) hardware.
Based on the AMSTRAD "ANT" (Arnold Number Two) design, optimized for 
monochrome display.

2. SUMMARY
- Processor: Z80A-CPU at 4.00 MHz (+/-0.1%).
- Video: VDU accesses stretch _MREQ (via _WAIT), IORQ cycles are not stretched.
- Interrupts: _NMI (floppy), _INT (floppy, VDU, expansion). 3.328ms timer 
  interval.
- Memory: Up to 2MB, using 16k blocks (0-127). 128k/256k/512k internal, 
  expandable.
- Bank Switching: 4 x 16k banks (0000h-FFFFh) configurable for R/W.
- Bootstrap: Printer controller supplies initial code post-reset.
- VDU: Monochrome pixel memory, scan line table, and keyboard mapping in
  standard RAM.

=== End of Summary - Full details in original document ===