SpidersWeb wrote:I think it's Amstrad season Good blog, I had a good read through earlier. No doubt I'll be referencing that article if I ever get a 6128 in the future (I got a pair of 464's today)
From memory those disks are something awesome like 72KB per side? It's been well over 20 years since I used one.
tezza wrote:Those disks... No me thinks they are around 360k on each side. I'll need to check on the exact capacity but they are 80 track double density.
tezza wrote:Ok it seems they are 40 track and about 178k. Since the machine can write/format/read to an 80 track double density 3.5 inch drive I'm assuming it either doublesteps or just uses the first 40 tracks. Probably the latter.
Gibsaw wrote:So, being a CP/M derivative, I'd imagine there's a modified DOS hanging around able to use different densities? Or is that just a phenomenon of the TRS80 line?
tezza wrote:One the point of discussion though, did something like PRODOS (for the Apple IIe range) support double density? Or does this term have no meaning with Apple II Disk technology, given it's stripped-down chipset is quite different from other disk controller read/write conventions of the time? Just curious?
SeanKennedy wrote:Don't want to show the master up, but have you tried Alien1.4? Looks from the txt file that it can do these Amstrad types:
Amstrad CPC 464
Amstrad 6128 Side 0
Amstrad 6128 Side 1
Amstrad CPC 6128
Amstrad PCW 8512
I remember having a copy of this on 5.25" disk somewhere - great for getting old CP/M disk onto PC. But I dug it up here.
Gibsaw wrote:It also happened a bit less because where other machines were using MFM encoding, the Apple II's GCR was a bit more efficient. i.e. 140k where MFM would achieve <100k. So for a while, if software was being ported from another platform, the 140k was adequate.
tezza wrote:Hmm...are sure about this? Most of my machines that use MFM (double density) typically give you 160-180k on a 40 track single sided floppy. Single density (FM) 40 track, single sided disks on the other hand hold only 80k or so.
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