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add configurable random 1-bit rate for MC3470

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This commit is contained in:
Christopher A. Mosher 2020-04-18 12:19:01 -04:00
parent 05d91f9a1b
commit e2df466413
6 changed files with 22 additions and 12 deletions
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14
src/configep2.cpp
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@ -226,7 +226,7 @@ void Config::tryParseLine(const std::string& line, MemoryRandomAccess& ram, Memo
std::string sCardType;
tok >> slot >> sCardType;
insertCard(sCardType,slot,slts,gui);
insertCard(sCardType,slot,slts,gui,tok);
}
else if (cmd == "motherboard") {
std::string op;
@ -502,7 +502,7 @@ void Config::saveDisk(Slots& slts, int slot, int drive)
slts.get(slot)->save(drive-1);
}
void Config::insertCard(const std::string& cardType, int slot, Slots& slts, ScreenImage& gui)
void Config::insertCard(const std::string& cardType, int slot, Slots& slts, ScreenImage& gui, std::istringstream& tok)
{
if (slot < 0 || 8 <= slot)
{
@ -523,12 +523,18 @@ void Config::insertCard(const std::string& cardType, int slot, Slots& slts, Scre
}
else if (cardType == "disk") // 16-sector LSS ROM
{
card = new DiskController(gui,slot,false);
double random_ones_rate(0.3); // WOZ spec v2.0: 30%
tok >> random_ones_rate;
std::cerr << "MC3470: rate of 1 bits during random bit generation: " << random_ones_rate << std::endl;
card = new DiskController(gui,slot,false,random_ones_rate);
disk_mask |= (1 << slot);
}
else if (cardType == "disk13") // 13-sector LSS ROM
{
card = new DiskController(gui,slot,true);
double random_ones_rate(0.3); // WOZ spec v2.0: 30%
tok >> random_ones_rate;
std::cerr << "MC3470: rate of 1 bits during random bit generation: " << random_ones_rate << std::endl;
card = new DiskController(gui,slot,true,random_ones_rate);
disk_mask |= (1 << slot);
}
else if (cardType == "clock")

2
src/configep2.h
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@ -40,7 +40,7 @@ private:
static void loadDisk(Slots& slts, int slot, int drive, const std::string& fnib);
static void unloadDisk(Slots& slts, int slot, int drive);
static void saveDisk(Slots& slts, int slot, int drive);
static void insertCard(const std::string& cardType, int slot, Slots& slts, ScreenImage& gui);
static void insertCard(const std::string& cardType, int slot, Slots& slts, ScreenImage& gui, std::istringstream& tok);
static void tryParseLine(const std::string& line, MemoryRandomAccess& ram, Memory& rom, Slots& slts, int& revision, ScreenImage& gui, CassetteIn& cassetteIn, CassetteOut& cassetteOut);
public:

4
src/diskcontroller.cpp
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@ -17,9 +17,11 @@
*/
#include "diskcontroller.h"
DiskController::DiskController(ScreenImage& gui, int slot, bool lss13):
DiskController::DiskController(ScreenImage& gui, int slot, bool lss13, double random_ones_rate):
gui(gui),
slot(slot),
drive1(random_ones_rate),
drive2(random_ones_rate),
currentDrive(&this->drive1),
load(false),
write(false),

2
src/diskcontroller.h
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@ -78,7 +78,7 @@ private:
void stepLss();
public:
DiskController(ScreenImage& gui, int slot, bool lss13);
DiskController(ScreenImage& gui, int slot, bool lss13, double random_ones_rate);
~DiskController();
void tick();

5
src/drive.cpp
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@ -16,12 +16,13 @@
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "drive.h"
Disk2Drive::Disk2Drive():
Disk2Drive::Disk2Drive(double p_random_ones_rate):
stepper(head),
pulse(false),
bitBufferRead(0),
random_ones_rate(p_random_ones_rate),
generator(std::chrono::system_clock::now().time_since_epoch().count()),
distribution(0,1) {
distribution(0.0,1.0) {
}
bool Disk2Drive::loadDisk(const std::string& fnib) {

7
src/drive.h
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@ -38,15 +38,16 @@ private:
const double random_ones_rate;
std::default_random_engine generator;
std::uniform_int_distribution<int> distribution;
std::uniform_real_distribution<double> distribution;
bool randomBit() {
return !distribution(generator);
return distribution(generator) < random_ones_rate;
}
public:
Disk2Drive();
Disk2Drive(double p_random_ones_rate);
bool loadDisk(const std::string& fnib);
void unloadDisk();
bool isLoaded() const;