@ECFF.ADF IBM 5250 Emulation Adapter/A
5250_V2.zip DP5250.COM emulation program, BASIC files (zipped image)
5250_Remote_v201.zip Remote 5250 Emulation v2.01 (zipped image)
General Twinax Information
Disk images and photos provided by David Beem. Thanks!
5250 Emulation Adapter/A P/N 69X6294, 69X6282
There are no visible part IDs on the board. The IDs shown here are
completely made up.
C1 large MLCC?
CN1 male DB-15 connector
M1-3 256Kx4 DRAM
RG µA7905C -5 V regulator
U3 93X2670 or 93X2655 (ESD)
U4 Intel N8259A-2 PIC
U5 8088-2-P (Siemens or AMD)
Y1 24.00000 MHz osc
M1-3 256Kx4 DRAM - Samsung KM44C256BJ-10 or TI TMS44C256DJ-12
U3 93X2670(ESD) (card P/N 69X6294?) or 93X2655(ESD) (card P/N 69X6282?)
The card is marked 93X2695 and another sticker says "To replace card order
PN 69X6294" or "...69X6282".
From Fred Mau:
15-pin *male* connector on the PC board? Almost has to
be a 5250 Display Station Emulation Adapter (DSEA), It's the only cards
Ive ever heard of that uses a 15-pin male. It allows a PC to act as a terminal
on an AS/400 twinaxial network. There should also be a pigtail about 12"
long with a twinaxial T connector on one end and 15-pin female on the other
end that attaches to this card.
My HMM shows the (early, for system 36/38) 5250 DSEA as
being a 69X6294 or the (later, for AS/400) 5250 DSEA as being a 64G3506,
but maybe there were some variants.
AdapterId ECFF IBM 5250 Emulation Adapter/A
This allows you to choose the memory address for the adapter.
Each adapter must have a unique address range.
C4000-C5FFF, C8000-C9FFF, CC000-CDFFF, D0000-D1FFF, D4000-D5FFF, D8000-D9FFF
; DE000-DFFFF, C2000-C3FFF, C6000-C7FFF,
CA000-CBFFF, D2000-D3FFF, D6000-D7FFF, DA000-DBFFF
I/O address for adapter. Each adapter must have a unique
01800-0187F, 02400-0247F, 02800-0287F, 05400-0547F, 0A400-0A47F, 0E000-0E07F,
Interrupt level for the adapter or disable the adapter
Interrupts 9, 10, 11, 12 will be implemented in the future,
at which time the comment marker will be removed. (Ed.
Note that Disabled is commented out..)
; 9, 10, 11, 12, Disabled