The new REG_DEPOSIT register flag bit indicates that updates to a
REGister with this flag specified will invoke the sim_vm_reg_update
routine after the data has been updated.
No clear reason to do this, given the SDL code path in the call to
SDL_WaitEvent, but initializing at startup adds no overhead and
was reported to help some debugging activities.
The North Star MDS-AD disk controller supports both single- and
double-density operation. While mixed-density is supported by the
controller, it is not supported by AltairZ80 due to a limitation of the
.nsi image file format. The .nsi image file format requires all sectors
to be of the same density.
The "Window" bit was getting cleared too late, causing the "next" sector
to be written under North Star DOS. Due to differences between CP/M and
North Star disk access routines, this was not an issue under CP/M.
Test: Verify that North Star DOS and CP/M can format, copy and verify an
entire disk.
North Star Disk Operating System, Version 2.1.1, at 100
+GO DT 2
SINGLE(S) OR DOUBLE(D) DENSITY TEST? D
BOTH SIDES (Y OR N)? Y
LOAD DISKETTE THEN PRESS RETURN TO BEGIN TEST
PASS COMPLETE
PASS COMPLETE
PASS COMPLETE
PASS COMPLETE
PASS COMPLETE
CONTROL-C STOP
+GO CD 1 2
COPY BOTH SIDES (Y OR N)? Y
LOAD DISKETTES AND PRESS RETURN WHEN READY.
COPY COMPLETED.
+GO CK 1
DISKETTE CHECK, VERSION 1
CHECK CODE: 46513
+GO CK 2
DISKETTE CHECK, VERSION 1
CHECK CODE: 46513
+
- Recent Linux versions don't install ifconfig by default and now use
the new ip command for network details.
- Avoid writing command results to a temp file and use popen instead.
Change test for -e (exists) instead of -d (directory) so that the .git
entry is detected correctly and git version stamp logic runs as in any
other git repo. The .git entry is a file when the repo is a submodules
and possibly other obscure cases like multiple worktrees.
fixes#988
* Properly handle the case when a disk is not attached.
* Add register access for debugging.
* Assert DRQ as well as IRQ for software that checks DRQ.
* Add API to get the number of heads for the currently-selected
disk.
* Follow SIMH conventions for debug logging.
* Add ability to debug IMD from the wd179x debug settings.
Tests:
* Format and disk access on Cromemco CP/M 2.2, CDOS, 86-DOS,
MS-DOS 1.25, OASIS 5.6.
The ImageDisk sectsize field was incorrectly set to the number of
bytes in the sector, when it should be an index as follows:
00 = 128 bytes/sector
01 = 256 bytes/sector
02 = 512 bytes/sector
03 = 1024 bytes/sector
04 = 2048 bytes/sector
05 = 4096 bytes/sector
06 = 8192 bytes/sector
Tested disk formatting on MS-DOS 1.25, Cromemco CP/M 2.2,
Cromemco CDOS, OASIS 5.6.
The AB Digital Design B810 RAM card is a 256K Dynamic RAM card
with onboard refresh logic. AltairZ80 support emulates four of
these cards for a total of 16 banks.
As used for the OASIS operating system, the B810 is configured
with common memory at the low addresses (0000h-3FFFh) with 16
banks of 48K from 4000h-FFFFh.
In order to have the common memory appear from 0000-3FFFh, set
the COMMONLOW register to 1:
D COMMONLOW 1
