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Apple clone on an FPGA
- Subject: Apple clone on an FPGA
- From: Alex Freed <alexf@mirrow.com>
- Date: Wed, 22 Jun 2005 02:56:15 -0700
- Newsgroups: comp.sys.apple2
- User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)
- Xref: g2news1.google.com comp.sys.apple2:12273
Many years ago I made an Apple ][ clone. Maybe I'm getting soft in the
head, but this year I did it again, with a twist. Everything including
the CPU fits in a single FPGA with room to spare.
This bring the question. I would like to add a Z80 "Softcard" but I
don't have one any more. Does anyone have a manual? If you could scan at
least the schematic diagram, would be great!
What works so far:
100% hardware emulation of an Apple ][ plus cycle accurate.
Read nibblized images of floppies made for software emulators.
Boots ProDOS from a Compact Flash card with an image of a hard disk.
Uses a VGA monitor. Had to double the pixels to accomodate the scan rate.
-Alex.