rf5060a.exe 8550/Z
Refdisk (not for the Reply OEM upgrades)
Still haven't figured out all the variants.
187-207 8550 MODEL R21
187-049 IBM PS/2 Model 50 (-021)
188-080 Model 50 Z Systems with Improved Hardfile and Memory (-031,-061)
188-082 IBM PS/2 60MB FIXED DISK DRIVE
8550 ST-506 (50 pin edgecard)
8550 DBA-ESDI, Bare (72 pin edgecard, Bare card)
8550 DBA-ESDI 60MB (72 pin edgecard)
50z Riser ROMs Thanks to Dr Jim!
15F6994_U18.BIN U18 Even 15F6994
15F6995_U19.BIN U19 Odd 15F6995
8550 Drive Controllers (Peter Wendt)
60mbbuff.exe PS/2 60MB Fixed Disk Buffer Test v1.10
60mfdisk.com 60MB Fixed Disk Upg for M50-021 v1.00
Procom MC Pira IDE
Disk Drives
8550-021 - 20MB HD (uses 72X8505/90X8642)
8550-031,-061 160MB (used 90X9441, no chips) 50Z
8550-032 - 30MB 50Z
8550-061 - 60MB 50Z
My pocket ref says:
| System |
FRU |
Size |
Interface |
IBM |
| 8550 |
72X8522 |
20 |
ST506 |
WD325N |
| 8550Z |
6128287 |
30 |
ST506 "like" |
WD336RT |
| 6128294 |
30 |
ESDI "like" |
WD387 |
| 8570 |
56F8895 |
160 |
ESDI "like" |
WD380S |
8550 ST-506 FRU
90X8642
J1 50-pin edge
connector
U1 Intel 8051AH
microcontroller
U2 IBM 6127784
U3 IBM 6127893
U4 IBM 5960904
U5 Toshiba T5627 |
U7 83X3202
U10 Hitachi HM6116LFP-3
U25 Motorola MC3486P
U26
AMD AM26LS31PC
Y1 12.0MHz xtal (for
U1)
Y2 20.017MHz xtal (for
U5) |
Intel 8051AH NMOS Single-Chip 8-Bit
Microcontroller Datasheet
Hitachi HM6116LFP-3 (RAM)
Motorola MC3486P Quad EIA 422 / 423
Line Receiver Datasheet
AMD AM26LS31PC Quad High Speed
Differential Line Driver Datasheet
Dave Beem spouts off with:
Apparently it is a
different drive (50-pin edge connector) than the 20Mb
the Model 25/30 (44-pin) had. The Model 25/30 type also
had a 30Mb brother that ran on the 286 version of those
PS/2s. On the Model 50 the 20Mb was the only ST-506
drive type.
6127881B
8550 Bare 90X9441
David Beem says:
90X9441 is ESDI.
There are two circuit board variants of this, with no
discernible differences: Circuit board 15F8434 has
silkscreen outlines (not populated) for two capacitors
& wider power runs than the 90X9354 circuit board.
90X9354
(90X9441)
8550
90X9571 P/N 15F6993 (50-021 w/60MB
upgrade)
J1 72 pin edgecard socket
U18 BIOS 15F6994 (Even)
U19 BIOS 15F6995 (Odd)
U18, U19 D2764A-2 64K (8K x 8) UV Erasable
PROM 180ns [?] 28 pin
50z Riser ROMs
Dr Jim delivered the twins.
I was able to remove the EPROMs with minimal
damage but it was a PITA. Wouldn't use them in sockets,
reliability might be an issue. I see good text in the code
but of course I can't guarantee there isn't any random bit
rot. Should be good though.
15F6994_U18.BIN U18 Even 15F6994
15F6995_U19.BIN U19 Odd 15F6995
Per Mueller:
"In response to user complaints about the
storage capacity of the original 20M Model 50, IBM
offers the PS/2 60M hard disk drive as an upgrade
option. You can install this drive by replacing the
existing 20M [ST-506] hard disk in the PS/2 Model 50
(8550-021) or 30M [ESDI] in the Model 50 Z (8550-031).
No trade-in is available for the earlier
drive. This drive provides 60M of storage and a faster
access time of 27ms. The replacement adapter card
required for the 50-021 is included [but is already
there on the 50-031]."
8550 Drive
Controllers
Peter H. Wendt 1/28/09
There are 3 risers from IBM:
- Bare ESDI riser for the Mod. 50Z to be used with the
72-pin card-edge drives. Passive. Does nothing but
guiding signals.
- MFM controller for the 8550-021 with the "narrow"
card-edge slot for the 20MB MFM drive. ID is DFFD, just
like for the full length Mod. 60/80 MFM controller.
(http://www.mcamafia.de/mcapage0/jpg/dffd_2.jpg)
- ESDI upgrade riser, with the 72-pin card edge slot for
the drive and some glue logic to make drive addressing
possible, since the original Mod.50 lacks the ESDI code
in the machine BIOS. Controller ID is also DF9F, which
is that of the attached drive, which
actually *is* a MCA controller card + drive mechanism in
one. Back then ESDI was a big thing and AT only knew MFM
(not even RLL). The early Mod. 50 BIOS is largely that
of the AT ...
In addition I saw a 5.25" FDD controller riser (RFI ?
Long gone), a variant of the ARCO IDE card (without rear
bezel and handle), a similar thing from Procom for a
3.5" drive with a special sled (IDE most likely), a QIC
tape adapter (Borsu or Iomega - can't recall), which
feds a flat ribbon cable out at the rear. Unit was
a bulky 5.25" drive with power supply, fan and
impressive power switch. And another tape adapter which
operated with a floppy streamer in the second FDD bay.
All these adapters were for the 50Z only, since that one
did not need an extra HD controller - unlike the
original -021 (non-Z).