Disable only internal drive DOS1 ?

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Par retrocanada76

Champion (480)

Portrait de retrocanada76

23-02-2020, 04:05

HI, is there any program to disable the internal drive ?

I got a EmuFDC but in systems with internal drive like CF-3300 I cannot get enough TPA for some games. Pressing CTRL will still initialize the internal FDD and SHIFT will disable both.

I believe such a program would go to basic do some magic and return to dos.

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Par gdx

Prophet (4045)

Portrait de gdx

23-02-2020, 08:16

If you replace or rewrite the IC3 (27128) of the FDD board with one of the two Disk-Rom below, you will be able to disable it by pressing BS key at startup.

Download: https://mon-partage.fr/f/h1cSpamD/

This Rom seems use a socket so no need to solder.

Disk-Rom from the CF-5500 is probably the same that was updated. So I think you can use it. Make a backup of the original Rom before proceeding.

Par retrocanada76

Champion (480)

Portrait de retrocanada76

23-02-2020, 10:50

Ow that's good. I have spare 27C128's here.

I'll try it.

i compared the roms with the 3300 original one and this one is just the addition of 2 hooks checking the (FBE2) bit 3.

Thanks

Par retrocanada76

Champion (480)

Portrait de retrocanada76

24-02-2020, 07:25

It works fine except that is actually DEL button not BS.

Thanks

Par gdx

Prophet (4045)

Portrait de gdx

24-02-2020, 09:31

Sorry, if you prefere BS, replace "3A E2 FB CB 5F" by "3A E1 FB CB 6F" at 03F40h and 03F50h.

Which Rom did you use?

Par sdsnatcher73

Paragon (1523)

Portrait de sdsnatcher73

24-02-2020, 11:24

@gdx: that is a nice mod. Do you have it also for NMS8245 (preferably 1.08 version)?

Par gdx

Prophet (4045)

Portrait de gdx

24-02-2020, 11:55

Where is this version available?

Par sdsnatcher73

Paragon (1523)

Portrait de sdsnatcher73

24-02-2020, 12:42

It’s in the systemroms.zip on msxarchive.nl as a 64kB EPROM dump (last 16kB is the disk ROM).

Par retrocanada76

Champion (480)

Portrait de retrocanada76

24-02-2020, 22:35

I used the 3300 version as I compared it to my version and only the hooks changed. I'm totally fine with DEL. Just to clarify as I pressed BS and it didn't work Big smile

Par gdx

Prophet (4045)

Portrait de gdx

24-02-2020, 23:50

Here is the version for the NMS-8245:
https://mon-partage.fr/f/aOhqgrtw/

Par sdsnatcher73

Paragon (1523)

Portrait de sdsnatcher73

25-02-2020, 20:02

Thanks gdx! Working great!

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