Dos 2.0s on a EPROM?

[DavidMil]

Did anybody put DOS 2.0s on an EPROM? I found a 4K chip that seems to have DOS on it.

Here is the dumped file...

 

David

 

DOS.BIN

[1050]

Well they tried and failed to include anything more

than partial DUP.SYS for DOS 2.5. Won't work at all

without DOS.SYS and code to move it from cartridge

area to where DOS lives. To do it right, it would

have to be re-assembled to live in the cartridge

area of memory, I really doubt someone did that

much work, was successful and we heard nothing

about it EVER. AND you've got it in your attic.

 

What is it then? A wish upon a star perhaps? How

does one know unless one gives it a try? I can see

somebody trying it with limited knowledge of how

it all works while certainly having a skill set

for moving and burning code.

[Rybags]

Dos 2.5 on a bankable cartridge that just copied it to Ram as if it booted from disk would have been a good idea in the day.

Of course better would be running from the cart itself and just needing a fraction of the normal Ram for buffers and code stubs.

 

These days with plenty of SDX solutions in Rom it's sort of redundant.

 

DUP.SYS = 42 sectors so too big for a 4K Rom by about 1150 bytes.

[+DrVenkman]

Dos 2.5 on a bankable cartridge that just copied it to Ram as if it booted from disk would have been a good idea in the day.

Of course better would be running from the cart itself and just needing a fraction of the normal Ram for buffers and code stubs.

 

These days with plenty of SDX solutions in Rom it's sort of redundant.

 

DUP.SYS = 42 sectors so too big for a 4K Rom by about 1150 bytes.

 

Sure, I suppose. But remember that when DOS 2.5 came out, there was a large installed based of 800 and even upgraded 400 computers out there that needed the cartridge slot for BASIC, PILOT, Action!, ASSEMBLER/EDITOR or whatever other cartridge-based language they were tinkering with. They wouldn't have been able to use a cart-based DOS and still get anything done with their computers.

[+Nezgar]

I seem to recall reading about a utility cart that had various DOS's, sector copiers, and programming utilities on a cartridge... maybe a Nir Dary creation? But I'm also thinking something like this existed back in the day too...

[thorfdbg]

Well they tried and failed to include anything more

than partial DUP.SYS for DOS 2.5.

 

What is it then? A wish upon a star perhaps? How

does one know unless one gives it a try? I can see

somebody trying it with limited knowledge of how

it all works while certainly having a skill set

for moving and burning code.

Dos 2.5, even only the FMS part, is too bulky for this. One has to strip this down seriously. Dos 2.5 contains a couple of functions that are not required for a ROM-based FMS, such as the MEM.SAV, and it is a bit wasteful with memory as well. For example, there is a separate buffer for the directory alone. In Dos++, the Dos that comes with Atari++, I was able to fit the FMS into 3K, from C000 to CBFF, but this is quite a squeeze - so quite some memory-footprint related optimizations are used here.

 

A menu-based DUP does not fit. There is just too much code, and too much data. Dos++ comes with a command line that fits into a fraction of the "Self-Test" ROM area.

[guus.assmann]

Hello,

 

Well, I've once made it.

The idea was to have a solid state disk-drive.

So I've made a bank-switched set of Eproms, copied Dos to Ram, initialised it and had it read the "files" in Eprom as if it were on a disk.

I've never finished it, due to lack of time.

And as things go, someone was interested and "promised" to finish it.

That's the last I ever heard of it.

 

Many yeas later I've made the Mega Speedy. (after taking it from the initial designer and with a lot of valuable help from Hias)

This contains the Speedy units with a Dos build in. (and copy program)

 

BR/

Guus

[w1k]

i have dos 2.5 in eprom

[Guest]

I seem to recall reading about a utility cart that had various DOS's, sector copiers, and programming utilities on a cartridge... maybe a Nir Dary creation? But I'm also thinking something like this existed back in the day too...

 

Utility Cartridge V1.0

 

contents:

 

■ myDos ■ turbo basic XL ■ MycopyR ■ Toms XL Navigator ■ Dos Menu

■ Freezer XL/XE ■ translator XL/XE ■ happy master ■ 1050 diagnostic ■ test

■ disk wizard 2 ■ howfen dos ■ tape2disk ■ assembler ■ super packer

Edited February 6, 2018 by Guest

[+Nezgar]

I dumped David's strange EPROM chip myself, and Byte 0 was $FF in the previous dump, should be $53. Attached new dump. (Not that it helps much lol)

The text strings almost seem to be like a capture output from someones usage of DOS 2:

697 FREE SECTORS››..  COPYING---D8:COPY32.COM

WHICH DRIVE TO FORMAT?
TYPE "Y" TO FORMAT DISK 2›D2:

TYPE "Y" TO CREATE MEM.SAV
MEM.SAV FILE ALREADY EXISTS

DRIVE TO WRITE DOS FILES TO?
WRITING NEW DOS FILES
TYPE "Y" TO WRITE DOS TO DRIVE 2.
D2:DOS.SYS
ERROR - NOT VERSION 2 FORMAT.

D8: suggests DOS 2.5 130XE RAMDISK...

Anyone know of a COPY32.COM ?
697 Free Sectors - You'd never see that in the actual DUP code since it's computed dynamically..

ROMDOS2_0.BIN

[E474]

Hi,

 

Copy32.com is for copying from dos 3 to dos 2.

[_The Doctor__]

mydos was put on a cart and possibly remember a mention or 3.3c being put on a cart...other odds and ends... I see someone posted about the utility cart.... I don't see 2.0s laying about.. the rom posted here looks to be a sort of WIP.

 

I wouldn't mind 2.0s and 2.0d being on a cart... I vaguely remember a ram disk like method for 2.0s, and what of ROMdos?