6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-11-26 23:52:26 +00:00
Code Issues Projects Releases Wiki Activity

Prevented the 8272 from overreading ID fields (and, by doing so, overrunning its internal buffer). Exposed the MFMController's CRC generator for inspection.

Browse Source
This commit is contained in:
Thomas Harte 2017-08-07 12:37:22 -04:00
parent d07f3216ab
commit 47732ffb98
3 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Components/8272/i8272.cpp
View File

@ -131,7 +131,7 @@ void i8272::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive) {
CONCAT(read_header, __LINE__): WAIT_FOR_EVENT(Event::Token); \
header_[distance_into_section_] = get_latest_token().byte_value; \
distance_into_section_++; \
if(distance_into_section_ != 7) goto CONCAT(read_header, __LINE__); \
if(distance_into_section_ < 6) goto CONCAT(read_header, __LINE__); \
set_data_mode(Scanning);
#define SET_DRIVE_HEAD_MFM() \
@ -282,6 +282,10 @@ void i8272::posit_event(int event_type) {
main_status_ &= ~StatusRQM;
if(distance_into_section_ < (128 << size_)) goto get_byte;
// read CRC, without transferring it
WAIT_FOR_EVENT(Event::Token);
WAIT_FOR_EVENT(Event::Token);
// For a final result phase, post the standard ST0, ST1, ST2, C, H, R, N
goto post_st012chrn;

4
Storage/Disk/MFMDiskController.cpp
View File

@ -49,6 +49,10 @@ MFMController::Token MFMController::get_latest_token() {
return latest_token_;
}
NumberTheory::CRC16 &MFMController::get_crc_generator() {
return crc_generator_;
}
void MFMController::process_input_bit(int value, unsigned int cycles_since_index_hole) {
if(data_mode_ == DataMode::Writing) return;

3
Storage/Disk/MFMDiskController.hpp
View File

@ -70,6 +70,9 @@ class MFMController: public Controller {
/// @returns The most-recently read token from the surface of the disk.
Token get_latest_token();
/// @returns The controller's CRC generator. This is automatically fed during reading.
NumberTheory::CRC16 &get_crc_generator();
// Events
enum class Event: int {
Token = (1 << 0), // Indicates recognition of a new token in the flux stream. Use get_latest_token() for more details.