claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

FDC: Initialize DRVRATE to 1 on the OKI IF386AX so that 1.25 MB floppies can be read on a 3.5" 3-mode drive.

Browse Source
This commit is contained in:
OBattler
2025-04-01 09:18:12 +02:00
parent 1783da99a4
commit 3e7f8a18de
1 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/floppy/fdc.c
View File

@@ -2268,10 +2268,21 @@ fdc_reset(void *priv)
fdc_update_rwc(fdc, 1, default_rwc); fdc_update_rwc(fdc, 1, default_rwc);
fdc_update_rwc(fdc, 2, default_rwc); fdc_update_rwc(fdc, 2, default_rwc);
fdc_update_rwc(fdc, 3, default_rwc); fdc_update_rwc(fdc, 3, default_rwc);
fdc_update_drvrate(fdc, 0, 0); /*
fdc_update_drvrate(fdc, 1, 0); The OKI IF386SX natively supports the Japanese 1.25 MB floppy format,
fdc_update_drvrate(fdc, 2, 0); since it can read such images just fine, it also attempts to use data
fdc_update_drvrate(fdc, 3, 0); rate 01 on a 3.5" MB drive (which is the only kind it can physically
take, anyway), and rate 01 on a 3.5" MB drive is usually used by 3-mode
drives to switch to 360 RPM. Hence why I'm switching DRVDEN to 1, so
rate 01 becomes 500 kbps, so on a 3-mode 3.5" drive, 1.25 MB floppies
can be read. The side effect is that to read 5.25" 360k drives, you
need to use a dual-RPM 5.25" drive - but hey, that finally gets those
drives some usage as well.
*/
fdc_update_drvrate(fdc, 0, !strcmp(machine_get_internal_name(), "if386sx"));
fdc_update_drvrate(fdc, 1, !strcmp(machine_get_internal_name(), "if386sx"));
fdc_update_drvrate(fdc, 2, !strcmp(machine_get_internal_name(), "if386sx"));
fdc_update_drvrate(fdc, 3, !strcmp(machine_get_internal_name(), "if386sx"));
fdc_update_drv2en(fdc, 1); fdc_update_drv2en(fdc, 1);
fdc_update_rates(fdc); fdc_update_rates(fdc);