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The HAMEG HO-80 IEEE-488 card is driven by an NEC |PD7210C controller.
It supports the full IEEE 488-1978 standard. With Linux-IEEE this card is
compatible to an PCII card. Against the PCII you have to pay attention on some
different jumper setting. In opposit to the PCII th HO-80 contains an 8kB
BIOS-ROM. This ROM is not used by Linux-IEEE.
All settings ar taken using two DIL-switches (SW1 and SW2) and two
jumper-blocks (K1 and K2).
With SW1 the I/O adress, with K1 the IRQ, with SW2 the ROM-base
and with K2 th DMA-channel is selected.
Position: 1 2 3 4 5 6 7 8
Adress : A9 A8 A7 A6 A5 A4 A3 Bus-Master
For setting the I/O Adress 2B8h you have to convert it to binary:
1 0 1 0 1 1 1 0 0 0
The last three Bits represent the adresslines A2, A1 and A0.
These three Bits are not used.
Now setting up SW1 is easy :-) To get an 1 the switch is turned off, an for
an 0 the switch is turned on. So the following settings result:
Position: 1 2 3 4 5 6 7
Setting : off on off on off off off
With SW1-8 the Bus-Master for the IEEE-488 Bus is selected.
SW1-8 off: HO-80 is Bus-Master
SW2-8 on : HO-80 is not Bus-Master
Remember: Only one device can be Bus-Master. Normally th PC is used for this
Position: 1 2 3 4 5 6 7
Adress : A19 A18 A17 A16 A15 A14 A13
Count : 512K 256K 128K 64K 32K 16K 8K
By default the ROM is at Adress DE000h. (SW1 settings: 00100000). To change
the Adress of the ROM you can calculate the settings according to the
settings of SW1. On most Systems these Setting will work. If this
Memoryarea is used by an other Adapter (LAN, VGA....) you must change thes
settings. The Area E0000h and above is not usable! At E0000h the System BIOS
K1 IRQ setting:
o o IRQ7 LPT1 (normally usable)
o o IRQ6 Floppy (normally not usable)
o=o IRQ5 LPT2 (normally usable)
o o IRQ4 COM1 (normally not usable)
o o IRQ3 COM2 (normally not usable)
o o IRQ2 (only usable when IRQ9 is not used)
K2 DMA setting:
o o DACK1
o=o DACK3
o o DRQ1
o=o DRQ3
o o not used
On an AT-PC DACK3 and DRQ3 are recommended. If DMA3 ist used by an other
Card try DMA1 (DACK1 and DRQ1). If both are used leave all jumpers open and
compile the driver without DMA support.
I use this Card with my Graphtec MP1000 flatbed Plotter, an CBM 4031 Floppy
Drive and some Measurement equipment. If you have problems with tis Card
feel free to mail me. I'll try to help you fixing up the problem. or