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Propeller Firmware Enhancements

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- Support DEC graphics character set
- Allow use of all lines on VGA display
- Support inverted bits on front panel LEDs and switches by config
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Wayne Warthen
2024-01-22 14:21:20 -08:00
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@@ -1749,10 +1749,84 @@ with 6 slices containing 5 ready-to-run OSes and a slice with
the WordStar application files. Alternatively, you can create your own
hard disk image with the specific slice contents you choose.
#### Standard Hard Disk Physical Layout
As previously described in [Hard Disk Layouts], the exact placement of
slices and optional FAT partition will vary depending on which disk
layout (hd512 or hd1k) you are using and your partition table entries.
To simplify the use of hard disk images, RomWBW has adopted standard
partition table entries for disk image files provided.
These partition sizes and locations were chosen to:
- Fit entirely on 1GB media
- Allow for 64 CP/M filesystem slices
- Allow for a 384KB FAT filesystem
**NOTE:** RomWBW is not limited to these partition table entries. You
can change the size and location of the RomWBW and/or FAT partitions to
increase/decrease the number of slices or FAT filesystem size.
+---------------------------------+-------------------------------+-------------------------------+
| | **--- Legacy (hd512) ---** | **--- Modern (hd1k) ---** |
| +---------------+---------------+---------------+---------------+
| | Byte(s) | Sector(s) | Byte(s) | Sector(s) |
+=================================+==============:+==============:+==============:+==============:+
| RomWBW (slices) Start | 0 | 0 | 1,048,576 | 2,048 |
+---------------------------------+---------------+---------------+---------------+---------------+
| RomWBW (slices) Size | 545,259,520 | 1,064,960 | 536,870,912 | 1,048,576 |
+---------------------------------+---------------+---------------+---------------+---------------+
| FAT Filesystem Start | 545,259,520 | 1,064,960 | 537,919,488 | 1,050,624 |
+---------------------------------+---------------+---------------+---------------+---------------+
| FAT Filesystem Size | 402,653,184 | 786,432 | 402,653,184 | 786,432 |
+---------------------------------+---------------+---------------+---------------+---------------+
| \<end\> | 947,912,704 | 1,851,392 | 940,572,672 | 1,837,056 |
+---------------------------------+---------------+---------------+---------------+---------------+
The above partition table entries will result in the following locations and sizes of
filesystems on the RomWBW disk images.
+---------------------------------+-------------------------------+-------------------------------+
| | **--- Legacy (hd512) ---** | **--- Modern (hd1k) ---** |
| +---------------+---------------+---------------+---------------+
| | Byte(s) | Sector(s) | Byte(s) | Sector(s) |
+=================================+==============:+==============:+==============:+==============:+
| Prefix Start | -- | -- | 0 | 0 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Prefix Size | -- | -- | 1,048,576 | 2,048 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice Size | 8,519,680 | 16,640 | 8,388,608 | 16,384 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 0 Start | 0 | 0 | 1,048,576 | 2,048 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 1 Start | 8,519,680 | 16,640 | 9,437,184 | 18,432 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 2 Start | 17,039,360 | 33,280 | 17,825,792 | 34,816 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 3 Start | 25,559,040 | 49,920 | 26,214,400 | 51,200 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 4 Start | 34,078,720 | 66,560 | 34,603,008 | 67,584 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 5 Start | 42,598,400 | 83,200 | 42,991,616 | 83,968 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 6 Start | 51,118,080 | 99,840 | 51,380,224 | 100,352 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 7 Start | 59,637,760 | 116,480 | 59,768,832 | 116,736 |
+---------------------------------+---------------+---------------+---------------+---------------+
| Slice 63 Start | 536,739,840 | 1,048,320 | 529,530,880 | 1,034,240 |
+---------------------------------+---------------+---------------+---------------+---------------+
| FAT Filesystem Start | 545,259,520 | 1,064,960 | 537,919,488 | 1,050,624 |
+---------------------------------+---------------+---------------+---------------+---------------+
| FAT Filesystem Size | 402,653,184 | 786,432 | 402,653,184 | 786,432 |
+---------------------------------+---------------+---------------+---------------+---------------+
| \<end\> | 947,912,704 | 1,851,392 | 940,572,672 | 1,837,056 |
+---------------------------------+---------------+---------------+---------------+---------------+
#### Combo Hard Disk Image
The combo disk image is essentially just a single image that has several
of the individual filesystem images (slices) already concatenated
of the individual filesystem images (slices) already concatenated
together. The combo disk image contains the following 6 slices in the
positions indicated: