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Add a preliminary format for the 8050.

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dg
2023-05-08 23:03:37 +00:00
parent bfa0846ad0
commit 5adfa95a85
3 changed files with 89 additions and 17 deletions
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2
README.md
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@@ -118,7 +118,7 @@ choices because they can store multiple types of file system.
| [`atarist`](doc/disk-atarist.md) | Atari ST: Almost PC compatible | 🦄 | 🦄 | |
| [`bk`](doc/disk-bk.md) | BK: 800kB 5.25"/3.5" 80-track 10-sector DSDD | 🦖 | 🦖 | |
| [`brother`](doc/disk-brother.md) | Brother word processors: GCR family | 🦄 | 🦄 | BROTHER120 FATFS |
| [`commodore`](doc/disk-commodore.md) | Commodore: 1541, 1581, and variations | 🦄 | 🦄 | CBMFS |
| [`commodore`](doc/disk-commodore.md) | Commodore: 1541, 1581, 8050 and variations | 🦄 | 🦄 | CBMFS |
| [`eco1`](doc/disk-eco1.md) | VDS Eco1: CP/M; 1210kB 77-track mixed format DSHD | 🦖 | | CPMFS |
| [`epsonpf10`](doc/disk-epsonpf10.md) | Epson PF-10: CP/M; 3.5" 40-track DSDD | 🦖 | | CPMFS |
| [`f85`](doc/disk-f85.md) | Durango F85: 461kB 5.25" 77-track SS | 🦖 | | |

26
doc/disk-commodore.md
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@@ -1,9 +1,10 @@
<!-- This file is automatically generated. Do not edit. -->
# 1541, 1581, and variations
# 1541, 1581, 8050 and variations
Commodore 64 disks come in two varieties: GCR, which are the overwhelming
majority; and MFM, only used on the 1571 and 1581. The latter were (as far as I
can tell) standard IBM PC format disks with a slightly odd sector count.
Commodore 8-bit computer disks come in two varieties: GCR, which are the
overwhelming majority; and MFM, only used on the 1571 and 1581. The latter were
(as far as I can tell) standard IBM PC format disks with a slightly odd sector
count.
The GCR disks are much more interesting. They could store 170kB on a
single-sided disk (although later drives were double-sided), using a proprietary
@@ -21,11 +22,20 @@ computer](https://ilesj.wordpress.com/2014/05/14/1541-why-so-complicated/) of
300 bytes per second (!). (The drive itself could transfer data reasonably
quickly.)
A standard 1541 disk has 35 tracks of 17 to 21 sectors, each 256 bytes long
(sometimes 40 tracks).
- a 1541 disk has 35 tracks of 17 to 21 sectors, each 256 bytes long
(sometimes 40 tracks), and uses GCR encoding.
A standard 1581 disk has 80 tracks and two sides, each with 10 sectors, 512
bytes long.
- a standard 1581 disk has 80 tracks and two sides, each with 10 sectors, 512
bytes long, and uses normal IBM encoding.
- an 8050 disk has 77 tracks and two sides, with four speed zones; the number
of sectors varies from 23 to 29, using GCR encoding. These will store
1042kB. These drives are peculiar because they are 100tpi and therefore the
disks cannot be read in normal 96tpi drives.
- a CMD FD2000 disk (a popular third-party Commodore disk drive) has 81
tracks and two sides, each with 10 1024-byte sectors, for a massive 1620kB
of storage. This also uses IBM encoding.
A CMD FD2000 disk (a popular third-party Commodore disk drive)

78
src/formats/commodore.textpb
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@@ -1,13 +1,14 @@
shortname: 'Commodore'
comment: '1541, 1581, and variations'
comment: '1541, 1581, 8050 and variations'
read_support_status: UNICORN
write_support_status: UNICORN
documentation:
<<<
Commodore 64 disks come in two varieties: GCR, which are the overwhelming
majority; and MFM, only used on the 1571 and 1581. The latter were (as far as I
can tell) standard IBM PC format disks with a slightly odd sector count.
Commodore 8-bit computer disks come in two varieties: GCR, which are the
overwhelming majority; and MFM, only used on the 1571 and 1581. The latter were
(as far as I can tell) standard IBM PC format disks with a slightly odd sector
count.
The GCR disks are much more interesting. They could store 170kB on a
single-sided disk (although later drives were double-sided), using a proprietary
@@ -25,11 +26,20 @@ computer](https://ilesj.wordpress.com/2014/05/14/1541-why-so-complicated/) of
300 bytes per second (!). (The drive itself could transfer data reasonably
quickly.)
A standard 1541 disk has 35 tracks of 17 to 21 sectors, each 256 bytes long
(sometimes 40 tracks).
- a 1541 disk has 35 tracks of 17 to 21 sectors, each 256 bytes long
(sometimes 40 tracks), and uses GCR encoding.
A standard 1581 disk has 80 tracks and two sides, each with 10 sectors, 512
bytes long.
- a standard 1581 disk has 80 tracks and two sides, each with 10 sectors, 512
bytes long, and uses normal IBM encoding.
- an 8050 disk has 77 tracks and two sides, with four speed zones; the number
of sectors varies from 23 to 29, using GCR encoding. These will store
1042kB. These drives are peculiar because they are 100tpi and therefore the
disks cannot be read in normal 96tpi drives.
- a CMD FD2000 disk (a popular third-party Commodore disk drive) has 81
tracks and two sides, each with 10 1024-byte sectors, for a massive 1620kB
of storage. This also uses IBM encoding.
A CMD FD2000 disk (a popular third-party Commodore disk drive)
>>>
@@ -217,6 +227,58 @@ option_group {
}
}
option {
name: "1042"
comment: "1042kB 8051"
config {
layout {
sides: 2
tracks: 77
layoutdata {
sector_size: 256
}
layoutdata {
track: 0
up_to_track: 38
physical {
start_sector: 0
count: 29
}
}
layoutdata {
track: 39
up_to_track: 52
physical {
start_sector: 0
count: 27
}
}
layoutdata {
track: 53
up_to_track: 63
physical {
start_sector: 0
count: 25
}
}
layoutdata {
track: 64
up_to_track: 76
physical {
start_sector: 0
count: 23
}
}
}
tpi: 100
decoder {
c64 {}
}
}
}
option {
name: "1620"
comment: "1620kB, CMD FD2000"