Model 5550 386
5541 was released after 5550-S/T/V and it looks like PS/2 Model 53.
(I do not know the inside layout of Model 53). This machine can't take any
Display Adapter other than the Display Adapter B-II as its video sub-system.
Ref. ver. 1.00 to 1.36 are based on JDOS.
Ref. ver. > 1.4x are based on DOS/V.
Ref. ver. 1.50 covers most 386 models such as 5550-S/T/V, 5570-T/V, 5540-T, 5530-T.
Display Adapter B-2 was used for this
model. VGA chip is not provided on the planar.
Noticed that the display adapter seen
is not a B-II but more looks like V (AVEC). Don't know for sure if it's a B
(BVEC) or perhaps some member of the AVEC family.
(PS/55Z 5510-T, which is very similar to 5540, can be configured with XGA /A.)
|2MB||23F3270, 59F9046, 79F2566|
Hard Disk interface
Same as 8570 ESDI (more or less).
5540-T Planar (386DX 20 MHz)
Outline by Mr. Tahara (a member of FIBMJ # 4)
U8 NS16550AV NS16550
U9 90X9298 8042
U11 35F3489 ADDR G/A
U12 65F0082 EPP-3
U17 33F5838 I/O GA
U22 35F3489 DATA G/A
U25 33F5946 CPU G/A
U26 i80386 (DX)
U29 79F1016 MEM G/A
U32 FPU???? 80387
U34 N828077AA (FDD controller)
U37 65F0155 (BIOS EPROM)
J8 MCA Riser with ESDI connector
J9 Memory Riser Slot
J10 FDD connector (34-pin)
J14 72-pin SIMM slot
J13 Power? 8-pin (or SP?)
J16 Power? 7-pin
J7 Main Power Connector (10-pin)
One SIMM slot J14 is placed on the planar and additional 2 slots are
provided through SIMM riser card which goes to connector J9.
A bus riser for J8 connector has MCA card slots on the left side and
an ESDI HDD DB 2 connector is on the right side.
I/O connectors are placed as outline shows (Cable connectors are plugged in