On Tue, Feb 19, 2019 at 11:22 AM Bill Gunshannon via cctalk <cctalk@classiccmp.org> wrote: > > > I have mostly used CMD CQD-220/TM controllers. As far as I remember > > they do not have an RA drive emulation option. > > I have a 220A/TM and it certainly does. Pages 4-10 thru 4-15 > of the manual, particularly Configuration Options "A" and "1".
> Not familiar with the 220A/E it's not mentioned in my manual. > Probably a much newer version. What version of the CQD-220A manual do you have? Do you only have a hard copy, or do you have a scan of the manual? If you have a scan of the manual it would be great to get a copy of it. Currently there isn't any version of a CQD-220A manual on Bitsavers. I have a scan of the MAN-00220A-000, Rev. 1.1, December 17, 1993 version of the CQD-220A/223A manual. The RA drive emulation option must be newer than 1993 as I don't see it in the version of the manual I have. Also, there are two main versions of the CQD-220, the original CQD-220, and the newer redesigned CQD-220A version. The 'A' suffix is an important difference. Each main version has minor versions, which are are PAL and firmware differences. The original CQD-220 has 220/M (MSCP only), 220/T (TMSCP only), and 220/TM (both MSCP and TMSCP at the same time) versions. The 220/M and 220/T versions can be converted into a 220/TM version by replacing the CSR decode PAL and the firmware EPROMs. I know this can be done because I have done it several times myself. This original version is all through hole, except for the 53C90A SCSI controller in a PLCC package. The firmware is contained in two 27C256 EPROMs. The newer CQD-220A has 220A/TM (both MSCP and TMSCP at the same time) and 220A/M/T (either MSCP or TMSCP, but not both at the same time) versions. The boards that I have with CQD-220A/E stickers on them must be the same thing as a CQD-220A/M/T. This newer redesigned version is roughly half through hole, and half surface mount, including a large CMD ASIC. The firmware is contained in two 27C512 EPROMs. I just looked at the CQD-220/TM firmware images that I have. I must have the B2A 06/24/94 version installed on my boards. In that version I don't see any RA strings in the firmware image. In the B3 09/23/94 version I do see RA strings. CQD-220/TM B3 Firmware 09/23/94: "List of all supported device media type 0. Default value 1. RA 70 2. RA 80 3. RA 81 4. RA 82 5. RA 90 6. RA 92 7. RC 25" I'll have to try the B3 Firmware 09/23/94 version on my CQD-220/TM boards. Anyway, I'll still try to find time to see exactly what MSCP drive geometry a CQD-220A reports when configured for RA drive emulation.