ardent-blue
Experienced Member
- Joined
- Jan 2, 2015
- Messages
- 479
PS/2 Type 3 DMA Arbitrated Parallel Port page
Folks, I've been bedeviled by the DMA Arbitrated parallel port [Type 3] since the late 90's. All the stuff on this page is my [failing?] attempt to understand the PS/2 Type 3 parallel port, from physical pin-out to registers. I do have a copy of "The Parallel Port Complete", but it seems to be utterly devoid of any discussion of interfacing a Type 3 port to an ECP port.
My goal is to actually determine WHAT a Type 3 parallel port supports, ECP-wise. Then, possumbly, we can "fix" software that blows chunks when trying to communicate with a Type 3 port... The Type 3 works fine as a standard, bi-directional port. But the "extended mode" offers much more... Remember, this was at least 3 years prior to ECP.
Folks, I've been bedeviled by the DMA Arbitrated parallel port [Type 3] since the late 90's. All the stuff on this page is my [failing?] attempt to understand the PS/2 Type 3 parallel port, from physical pin-out to registers. I do have a copy of "The Parallel Port Complete", but it seems to be utterly devoid of any discussion of interfacing a Type 3 port to an ECP port.
My goal is to actually determine WHAT a Type 3 parallel port supports, ECP-wise. Then, possumbly, we can "fix" software that blows chunks when trying to communicate with a Type 3 port... The Type 3 works fine as a standard, bi-directional port. But the "extended mode" offers much more... Remember, this was at least 3 years prior to ECP.