600xl disk simulation?

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2 total messages Started by Hugh Redelmeier Thu, 19 Sep 1985 15:01

#1062

Author: Hugh Redelmeier
Date: Thu, 19 Sep 1985 15:01

25 lines
1600 bytes

I just bought a 600xl with 64K of RAM.  I did NOT buy a disk drive or
cassette drive: if I were to spend serious money, I would want to get
a serious machine.  But I can't resist hacking on the new toy.  I am
thinking that I might try to make one of my other computers simulate
a disk.

I understand that the disk port is really a 19.2K Baud serial line
at TTL levels (not RS232C levels).
- Is this true?
- What protocol is used to talk to the disk?
	- Is it asynch or synchronous?
	- What is the structure and meaning of the info transferred?
- What are the pinouts?  (By the way, what are the pinouts of
  the other connectors?)
- How much disk support is in the ROM?  On a DOS disk?
- What is the cassette interface: would it be easier to simulate?
- How does my 600xl differ from an 800xl?
- (Most important): what are good sources for this information
  (books, specific magazine articles, ...)?

The September BYTE article on upgrading to 256K RAM and the RAM-disk
software (posted by ihnet!bryan) contain some hints.

Hugh Redelmeier (416) 922-1937
{utzoo, ihnp4, decvax}!hcr!hugh

Re: 600xl disk simulation?

#1129

Author: djk611
Date: Mon, 30 Sep 1985 23:30

3 lines
1086 bytes

the disk port is indeed running at 19.2 kb and at ttl levels  there is no rom support for the disk persay  the cio (central i/o) is in rom and is easily accessed  the same connector is use for cassatte  but outputs are frequency(read tones) as opposed to signnals...the best source of info is atari tech notes or de re atari               
scott cothrell  urh 106 forbes hall  101 e. gregory dr. champaign il. 61820     university of illinois

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