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Accept irregular floppy disk sizes

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This commit is contained in:
Fabian 2022-03-10 21:06:50 +01:00
parent 7f37fcfccb
commit 48882e33ae
1 changed files with 27 additions and 30 deletions
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57
src/floppy.js
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@ -25,8 +25,6 @@ function FloppyController(cpu, fda_image, fdb_image)
this.response_index = 0;
this.response_length = 0;
this.floppy_size = 0;
/* const */
this.fda_image = fda_image;
@ -54,48 +52,47 @@ function FloppyController(cpu, fda_image, fdb_image)
this.sectors_per_track = 0;
this.number_of_heads = 0;
this.number_of_cylinders = 0;
this.floppy_size = 0;
}
else
{
this.floppy_size = fda_image.byteLength;
var floppy_types = {
160 : { type: 1, tracks: 40, sectors: 8 , heads: 1 },
180 : { type: 1, tracks: 40, sectors: 9 , heads: 1 },
200 : { type: 1, tracks: 40, sectors: 10, heads: 1 },
320 : { type: 1, tracks: 40, sectors: 8 , heads: 2 },
360 : { type: 1, tracks: 40, sectors: 9 , heads: 2 },
400 : { type: 1, tracks: 40, sectors: 10, heads: 2 },
720 : { type: 3, tracks: 80, sectors: 9 , heads: 2 },
1200 : { type: 2, tracks: 80, sectors: 15, heads: 2 },
1440 : { type: 4, tracks: 80, sectors: 18, heads: 2 },
1722 : { type: 5, tracks: 82, sectors: 21, heads: 2 },
2880 : { type: 5, tracks: 80, sectors: 36, heads: 2 },
[ 160 * 1024] : { type: 1, tracks: 40, sectors: 8 , heads: 1 },
[ 180 * 1024] : { type: 1, tracks: 40, sectors: 9 , heads: 1 },
[ 200 * 1024] : { type: 1, tracks: 40, sectors: 10, heads: 1 },
[ 320 * 1024] : { type: 1, tracks: 40, sectors: 8 , heads: 2 },
[ 360 * 1024] : { type: 1, tracks: 40, sectors: 9 , heads: 2 },
[ 400 * 1024] : { type: 1, tracks: 40, sectors: 10, heads: 2 },
[ 720 * 1024] : { type: 3, tracks: 80, sectors: 9 , heads: 2 },
[1200 * 1024] : { type: 2, tracks: 80, sectors: 15, heads: 2 },
[1440 * 1024] : { type: 4, tracks: 80, sectors: 18, heads: 2 },
[1722 * 1024] : { type: 5, tracks: 82, sectors: 21, heads: 2 },
[2880 * 1024] : { type: 5, tracks: 80, sectors: 36, heads: 2 },
// not a real floppy type, used to support sectorlisp and friends
0 : { type: 1, tracks: 1, sectors: 1, heads: 1 },
512: { type: 1, tracks: 1, sectors: 1, heads: 1 },
};
let floppy_size = fda_image.byteLength;
var number_of_cylinders,
sectors_per_track,
number_of_heads,
floppy_type = floppy_types[this.floppy_size >> 10];
floppy_type = floppy_types[floppy_size];
if(floppy_type && ((this.floppy_size & 0x3FF) === 0 || this.floppy_size === 512))
if(!floppy_type)
{
cpu.devices.rtc.cmos_write(CMOS_FLOPPY_DRIVE_TYPE, floppy_type.type << 4);
floppy_size = fda_image.byteLength > 1440 * 1024 ? 2880 * 1024 : 1440 * 1024;
floppy_type = floppy_types[floppy_size];
sectors_per_track = floppy_type.sectors;
number_of_heads = floppy_type.heads;
number_of_cylinders = floppy_type.tracks;
}
else
{
throw "Unknown floppy size: " + h(fda_image.byteLength);
dbg_log("Warning: Unkown floppy size: " + fda_image.byteLength + ", assuming " + floppy_size);
}
cpu.devices.rtc.cmos_write(CMOS_FLOPPY_DRIVE_TYPE, floppy_type.type << 4);
sectors_per_track = floppy_type.sectors;
number_of_heads = floppy_type.heads;
number_of_cylinders = floppy_type.tracks;
this.sectors_per_track = sectors_per_track;
this.number_of_heads = number_of_heads;
this.number_of_cylinders = number_of_cylinders;
@ -122,7 +119,7 @@ FloppyController.prototype.get_state = function()
state[4] = this.response_data;
state[5] = this.response_index;
state[6] = this.response_length;
state[7] = this.floppy_size;
state[8] = this.status_reg0;
state[9] = this.status_reg1;
state[10] = this.status_reg2;
@ -147,7 +144,7 @@ FloppyController.prototype.set_state = function(state)
this.response_data = state[4];
this.response_index = state[5];
this.response_length = state[6];
this.floppy_size = state[7];
this.status_reg0 = state[8];
this.status_reg1 = state[9];
this.status_reg2 = state[10];