Re: Transfer a 8250 diskette

-------- Original-Nachricht --------
> Datum: Thu, 10 Nov 2011 08:22:07 +0100
> Von: Niklas Ramsberg <niklas.ramsberg@swipnet.se>
> An: cbm-hackers@musoftware.de
> Betreff: Re: Transfer a 8250 diskette

> Commodore never fixed it on the 1541; I'm not sure about the 1571 and
> 1581. CMD fixed it with JiffyDOS though, so if you have JiffyDOS in
> your drive(s) you can use save-with-replace safely.

Actually it was fixed after the 1541-C was made in the upgrade ROM (See #3). This is the ROM the 1541-II was based on, so you can say all 1541-II are fixed:

>From: cbmvax.cbm!fred (Fred Bowen)
>Subject: 1541B ROM update
>Date: 12 Dec 86 23:14:51 GMT
>To: Commodore users

>1541B DOS ROM RELEASE NOTES
>Commodore Electronics, LTD.                     5 December 1986

>1541B ROM RELEASE NOTES: 251968-02   (16K byte, 300ns, checksum=$1A69)

>THE FOLLOWING MODIFICATIONS HAVE BEEN MADE TO THE  251968-01  ROM  CODE  TO
>CREATE A NEW ROM  RELEASED  ON  12/05/86.  THIS  RELEASE IS MADE TO  CREATE
>MASKED ROMS FOR PRODUCTION OF THE 1541B/C MODEL DISK DRIVE ONLY.

>1.  The interrupt rate change from 15 to 8ms for slightly better
>performance caused compatibility problems with some software that used that
>timing for its own purposes. It is now 15ms.

>2.  The 1541B  board  has  troubles  accessing tracks beyond 35
>attributable to the new data separator, although the problem always existed
>(wrong bit cell densities because TRKNUM only listed up to track 35).
>TRKNUM has been extended.

>3.  SAVE-@ (SAVE with replace) is fixed.  The variable  NODRV is now a
>16-bit addressable var,  and the STLBUF routine steals the buffer locked by
>drive one.

>4.  Relative File fixes (unspecified).

>5.  Serial bus (DEVICE NOT PRESENT) fix.  TSTATN now clears IRQ.

>6.  Block read fix (unspecified).

>7.  Write to stack area bug (unspecified).

>8.  Set decimal mode (SED) before disabling IRQ (SEI) fixed.

>9.  Disk full bug (unspecified).

>10.  Add copyright notice for legal types and thieves.

>11.  The ROM checksum adjustment byte at $C001 is now $46.

> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>  PLEASE NOTE:  THIS ROM WILL _NOT_ WORK IN EARLIER 1541 PCB'S, WHICH
>REQUIRE DIFFERENT SIZED ROMS (8K),  AMONG OTHER BOARD DIFFERENCES!
>  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>--
>Fred Bowen

>Commodore Electronics, Ltd.,  1200 Wilson Drive,  West Chester,  PA,  19380

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