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#!/usr/bin/perl
#
# Create MMU initialization file
#
# Each MMU entry is 16 bits; there are 4 address maps total.
# These are initialized with a 2K video RAM window at 30-32K.
# The defaults match the map uses from Mikrodatorn's 64K RAM
# expansion:
#
# Map 0: default (32K RAM)
# Map 1: 0-30K is RAM
# Map 2: 0-62K RAM; 62-64K video
# Map 3: 0-64K RAM, no video
#
# The format of each entry is as follows:
# Bits [15:12] -> device index:
# 0 - SRAM
# 1 - Unused
# 2 - Video RAM
# 3 - Character generator RAM
# 4 - BASIC ROM
# 5 - DOS ROM
# F - Hyperspace (reads FF, writes nowhere)
# The rest reserved for Ethernet, Flash,...
# Bits [11:0] -> A[19:8]
#
$testram = 0;
sub do_ram() {
if ( $testram ) {
for ( ; $i < 0xF0 ; $i++ ) {
printf("%03X : %04X;\n", $a++, 0xFFFF);
}
for ( $i = 0xF0 ; $i < 0x100 ; $i++ ) {
printf("%03X : %04X;\n", $a++, 0x1000|($i & 0x0F));
}
} else {
for ( ; $i < 0x100 ; $i++ ) {
# Important: No offset for this index
printf("%03X : %04X;\n", $a++, 0x0000|$i);
}
}
}
print "DEPTH = 1024;\n";
print "WIDTH = 16;\n";
print "ADDRESS_RADIX = HEX;\n";
print "DATA_RADIX = HEX;\n";
print "CONTENT\n";
print "BEGIN\n";
$a = 0;
# Map 0 (standard)
for ( $i = 0x00 ; $i < 0x40 ; $i++ ) { # BASIC
printf("%03X : %04X;\n", $a++, 0x4000|$i);
}
for ( $i = 0x40 ; $i < 0x60 ; $i++ ) { # Free for expansion
printf("%03X : %04X;\n", $a++, 0xFFFF);
}
for ( $i = 0x60 ; $i < 0x70 ; $i++ ) { # DOS
printf("%03X : %04X;\n", $a++, 0x5000|($i-0x60));
}
for ( $i = 0x70 ; $i < 0x74 ; $i++ ) { # IEC option
printf("%03X : %04X;\n", $a++, 0xFFFF);
}
for ( $i = 0x74 ; $i < 0x78 ; $i++ ) { # Video RAM (for 80 col only)
printf("%03X : %04X;\n", $a++, 0x2000|($i-0x74));
}
for ( $i = 0x78 ; $i < 0x7C ; $i++ ) { # PR option
printf("%03X : %04X;\n", $a++, 0xFFFF);
}
for ( $i = 0x7C ; $i < 0x80 ; $i++ ) { # Video RAM
printf("%03X : %04X;\n", $a++, 0x2004|($i-0x7C));
}
do_ram();
# Map 1 (standard layout in RAM)
for ( $i = 0x00 ; $i < 0x74 ; $i++ ) { # Various ROMs (in RAM)
printf("%03X : %04X;\n", $a++, 0x0000|$i);
}
for ( $i = 0x74 ; $i < 0x78 ; $i++ ) { # Video RAM (for 80 col only)
printf("%03X : %04X;\n", $a++, 0x2000|($i-0x74));
}
for ( $i = 0x78 ; $i < 0x7C ; $i++ ) { # PR option (in RAM)
printf("%03X : %04X;\n", $a++, 0x0000|$i);
}
for ( $i = 0x7C ; $i < 0x80 ; $i++ ) { # Video RAM
printf("%03X : %04X;\n", $a++, 0x2004|($i-0x7C));
}
do_ram();
# Map 2 (CP/M video enable)
for ( $i = 0x00 ; $i < 0xF8 ; $i++ ) { # RAM
printf("%03X : %04X;\n", $a++, 0x0000|$i);
}
for ( $i = 0xF8 ; $i < 0x100 ; $i++ ) { # Video RAM
printf("%03X : %04X;\n", $a++, 0x2000|($i-0xF8));
}
# Map 3 (CP/M all memory)
for ( $i = 0x00 ; $i < 0x100 ; $i++ ) { # All RAM
printf("%03X : %04X;\n", $a++, 0x0000|$i);
}
print "END;\n";
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