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@6263.ADF - Arco AC-1070 IDE Controller @62B6.ADF - Arco AC-1079 SLIM Drive Adapter Allows Mirroring! ARCO in an 8550
AC-1070 (Early) 
This card has the removeable slot cover . AC-1075 (?) 
This version seems to be an advanced version of the 1070. Note the much reduced chip count. J1, J4 Two pin headers
ARCO in a 8550 From Peter Some versions of the Arco IDE had been designed to substitute the "HD Riser" card in the hidden 4th slot on the Mod. 50. You just remove the blue tab at the card front and remove the rear slotcover - and the card should fit in there. IDE in an IML Machine?
System Partition on IDE?
Start Up Sequence
AC-1070 with IBM SCSI Adapters under W95
W95 and the AC-1070
More to come. I must get my 9590 back up to install W95 on an IDE drive.... BIOS Capabilities
Which version of the BIOS supports CD Roms?
CD Rom Drives on ARCO 1070 William Walsh was cracking the whip down at Farmwagon.com, and came up with: Ddecided to try my ATAPI CD-ROMs with the Arco 1070 controller. According to the startup screen, the controller has ROM Version 3.05. I was doing this in a Model 50Z PS/2. I also tried all of this in a 9577 Bermuda, an 8557slc, and a Model 8570-E61. The first thing I learned from trying this is that there must be a hard
disk attached to the adapter as well. I couldn't seem to get it to find
any of my CD-ROM drives without a hard disk attached. The ADF and Set
Next thing I learned is that you have to use an external power supply
for any CD-ROM drive above 6X with your Model 50. (The 70 PSU seemed to
handle things OK.) The 50Z PSU simply couldn't stand the 8X and
The Arco adapter also seems to be picky about what kind of CD-ROM drives it will accept. I had no problems with all of my 4X or 6X drives (all NEC units, and one Torisan), and of the one 24X drive (Toshiba) I tried, it was found by the adapter as well. I did not have the same luck with any of my 8X Hitachi drives. Those drives (8X Hitachi) resulted in system lockups and hard disk (10xxx) errors during POST. Anyway, once I had a CD-ROM drive installed and recognized by the adapter,
I tried loading DOS device drivers for the CD-ROM drive. The first driver
I tried (a seemingly universal one) just locked the machine
It seems that the unusual I/O addresses of the Arco adapter throw the CD-ROM device drivers that I tried for a loop. Summary: In theory, it seems that BIOS revision 3.05 of the Arco card
will support certain CD-ROM drives, but that the device drivers I tried
to use to make these CD-ROM drives work either locked the computer or could
find no CD-ROM drives.
PIO Mode Only >The .ADF for the Arco makes NO reference to the IRQ used (if
any). Now this could mean that it's hard-wired to IRQ14 (as is the onboard
ESDI), or that it is I/O polled.
Max Drive Size The ARCO may not see the 2.5(doubtful) It does have an EIDE limit of 2.1GB accordingly and also supports internal EIDE CD-Roms(for 5.25 inch bay units). But the it has its own Drive table settings on the card. Most likely when you preformatted the drive on a different computer the Cyls/Hds/S-T are different than what the BIOS on the card is going to see The AC-1070 controller's adapter BIOS supports IDE drives up to 2 Gb. If a drive was partitioned and formatted to a higher capacity, the controller will not permit the drive to operate under that partitioning scheme. My question- will it allow multiple 2.1 GB partitions?
ATAPI CDROM Support The @6263.adf, dated 07/02/95 has a section for CD Rom support. MCIDE.EXE
ATAPI CDROM Installation
IDE and SCSI From Tim Clarke Before this gets too out of hand - the rules for mixing an IDE/ESDI adapter with SCSI adapter(s) *for the Model 80* (and probably all others) are as follows: 1) you may only install one IDE or ESDI adapter 2) IDE/ESDI adapter's BIOS ROM *must* be configured with a lower address than that of the SCSI adapter(s) This is because the IDE/ESDI BIOS ROM code isn't intelligent enough to "add" the drives that it supports after any drives which may have already been installed by another BIOS ROM (e.g. multiple SCSI adapters with multiple HDs each). It assumes that the drive(s) that it supports will always be Drive 0 (BIOS Drive 0x80) and Drive 1 (BIOS Drive 0x81). The IBM SCSI adapters' BIOS ROM is designed to "add" it's drives to a system which already has one or more HDs already "installed" and utilises the XBDA (eXtended BIOS Data Area) to chain Int 13h, Int 4Bh (IBM SCSI) and note "first" and "count" values for each SCSI adapter.
AdapterID 6263 Arco Computer Products, Inc (IDE Adatpter) Adapter Memory Location
IO Address
Slave Drive is
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