12 Aug
2004
12 Aug
'04
9:56 a.m.
I seem to recall that my slow old N* Horizon was doing dd at 4mhz with no dma - in fact it
was polled I/O because their wait for I/O available kept locking up so I modified it.
best regards, Steve Thatcher
-----Original Message-----
From: Fred Cisin <cisin(a)xenosoft.com>
Sent: Aug 12, 2004 5:12 PM
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Subject: Re: Let's develop an open-source media archive standard
On Thu, 12 Aug 2004, Dwight K. Elvey wrote:
Hi Jules
Here is what I've found. It is a disk drive emulator.
Unless a PC is DMA driven, bit banging a floppy is not practical.
Disk I/O without DMA is not practical. But it IS possible.
Consider the PCJr and Tandy 1000, both of which do disk I/O
without DMA on 4.77MHz? machines.