Posted By
seff
on 2022-06-14
11:29:03
 |  VC1551 Disk Drive Speed vs Fast Loader
Hello Commodore 264 scene,
1)
Do you have some data as to what VC1551 transfer speed is?
My only source of reference is here, page 2:
Commodore 1551 User's Guide
1600 bytes/s
2)
Do you have some data as to what VC1551 + fast loader speed is?
There are many versions and I have no idea which one is the fastest.
3)
Are there any speed comparisons and/or baselines for 1541 vs 1551?
Commodore Disk Drive 1551 vs. 1541 Speed Comparison
(roughly 4x faster).
Thank you,
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Posted By
SVS
on 2022-06-14
06:46:32
 | Re: VC1551 Disk Drive Speed vs Fast Loader
Answering to 3) question:
Following my experience the real differences on speed 1551 -> 1541 is approximately 2x on writing and 3x in reading.
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Posted By
seff
on 2022-06-14
11:26:53
| Re: VC1551 Disk Drive Speed vs Fast Loader
I can only get C64 1541 and C64 1541 with fast loader transfer speeds:
Commodore bus
Fast loader
C64 + 1541 400 bytes/s
C64 + 1541 with fast loader 2560 bytes/s
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Posted By
Litwr
on 2022-06-14
13:47:48
| Re: VC1551 Disk Drive Speed vs Fast Loader
Krill's Loader for the C1541 is claimed up to 4 KB/s. It is really very interesting to get information about the C1551 max speed.
EDIT. I have just tested Fastload 1551 V4 (by Csory). It loads 55 KB Basic file in 7 seconds, the standard OS loading gives 66 seconds - I used plus4emu. So the standard transfer rate for this task is about 850 B/s, and the fast load gives us about 8100 B/s. It is quite possible to get a better speed but Krill didn't port his fantastic loader for the C1551. :(
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Posted By
seff
on 2022-06-14
13:50:48
| Re: VC1551 Disk Drive Speed vs Fast Loader
Nice! Will give it a shot and test some of the NTSC/blank screen loaders.
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Posted By
Mad
on 2022-06-14
15:29:52
| Re: VC1551 Disk Drive Speed vs Fast Loader
Just as a side note.. Bitfire (very fast IRQ Loader) was ported for the 1551 by BSZ (and Bubis I think). When I remember right he claimed that the "fastloading speed" is not so much over a normal drive read, not 100% sure of this information, though.. Could also be a lot faster..
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Posted By
seff
on 2022-06-14
15:36:38
| Re: VC1551 Disk Drive Speed vs Fast Loader
@gerliczer thank you for reminding me of the older threads.
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Posted By
Mad
on 2022-06-14
18:54:12
| Re: VC1551 Disk Drive Speed vs Fast Loader
And some Bitfire (very easy to use / any purpose irq loader) stats:
103 Blocks (26276 bytes) in Yape 1.1.7:
1541: 5.8 secs (4530 bytes per second) seems to be including "motor up" time
1551: 2.56 secs (10264 bytes per second) seems to be including "motor up" time
-> this is only useful if you are coding programs by yourself, it's not a common fastloader to be used for loading copied games and stuff, though..
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Posted By
Krill
on 2022-07-16
08:43:56
| Re: VC1551 Disk Drive Speed vs Fast Loader
Note that Transwarp https://csdb.dk/release/?id=214786 makes just below 20 KB/s on an unmodified 1541.
(Using a custom encoding that can be represented in d64, though.)
If fastloaders (the uninterruptible screen-off kind, not IRQ loaders) for 1551 that load a track in a single revolution exist (do they?), then those should be considered for 1541 vs 1551 speed comparisons. (Not sure if C16+1541 port of Transwarp would work, tbh.)
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Posted By
Krill
on 2022-07-16
08:57:57
| Re: VC1551 Disk Drive Speed vs Fast Loader
@Litwr : There is v184 https://csdb.dk/release/?id=189130 which still supports C16 builds.
A new release will come out asap, but it won't support 1551 natively yet (it does currently only via the KERNAL fallback option, so basically same transfer speeds as loading from plain BASIC).
1551 support is planned for the release after that, though.
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