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- Path: madoka.amitrix.com!ewaniu
- Newsgroups: comp.sys.amiga.hardware
- From: ewaniu@ee.ualberta.ca (Darren Ewaniuk)
- Subject: Re: A500-A570 CD SCSI?
- References: <310630A8.7FFD@vianet.net.au>
- X-NewsSoftware: GRn 2.1 Feb 19, 1994
- MIME-Version: 1.0
- Content-Type: text/plain; charset=iso-8859-1
- Content-Transfer-Encoding: 8bit
- Message-ID: <ewaniu.00x7@ee.ualberta.ca>
- Date: Fri, 26 Jan 96 19:40:25 MST
- Organization: My Amiga 3000
-
- In article <310630A8.7FFD@vianet.net.au> "G.Taylor" <carinehs@vianet.net.au> writes:
-
- > The A570 was got for a song and the A500 was my original Amiga which had an
- > ADDIDE board under the CPU and a Quantum HD.
- > Unfortunately, the A570 has a SCSI interface which meant I had to unplug the
- > IDE interface and HD in order to allow the A570 to boot.
- >
- > I have several questions someone may be able to help me with..
- >
- > 1) Is there a workaround, given the IDE / SCSI conflict?
-
- I'm more familiar with the CDTV, but the A570+A500 should be
- essentially the same.
-
- If I remember correctly (it's been a long time since I've tried
- an AdIDE in a CDTV), you can use the hard drive provided that you
- boot from a floppy.
-
- > 2) Can you simply connect a SCSI HD using the following ?
- > (In other words, is this pin allocation correct?)
- > ++++++++++++++++++++++++++++++++++++++++++++++
-
- > SCSI 50 way pins A570 Expansion contacts
-
- [Connection list deleted]
-
- The pinouts you listed are not correct.
-
- The CDTV and A570 have no SCSI controller present.
- The CD-ROM drive is some mutant 8-bit proprietary interface.
- However, it has the same DMAC as tha A590 and 2091, so you
- can add the SCSI chip and other related circuitry
- to complete the SCSI interface.
-
- The correct pinout for the CDTV/A570 DMA expansion is
- as follows:
-
- [Excerpt from CDTV Technical Page at
- http://www.ee.ualberta.ca/~ewaniu/cdtv/cdtv-technical.html]
-
- Note that the A570 connector is upside-down compared to the CDTV
- (I.E. pin 1 is top right)
-
- ---
-
- Connector:
-
- 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
- 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29
-
- 0.1" spacing double-row edge connector
- viewed from back of CDTV
-
- 1=GND 2=GND 3=VCC 4=VCC 5=SD1 6=SD0
- 7=SD3 8=SD2 9=SD5 10=SD4 11=SD7 12=SD6
- 13=/SDREQ 14=/INTX 15=/CSS 16=/SDACK 17=/IOR 18=/IOW
- 19=A8 20=7M 21=A6 22=A7 23=A4 24=A5
- 25=A2 26=A3 27=/IFRST 28=A1 29=GND 30=GND
-
- ---
-
- Other information about this port can be found at the above
- web address.
-
- DISCLAIMER: I assume no responsibility for the use of the above
- information. Hack at your own risk.
-
- --
-
- Darren President, Amiga Computer Users of Edmonton
- Ewaniuk email: ewaniu@ee.ualberta.ca
- HW Eng. www: http://www.ee.ualberta.ca/~ewaniu/
-