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'91 TDS 256KB RAM Card for the HP-48 SX
03-19-2015, 08:16 PM
Post: #5
RE: '91 TDS 256KB RAM Card for the HP-48 SX
(03-19-2015 08:00 PM)Christoph Giesselink Wrote:  From my knowledge of the HP48 hardware, it's not possible to switch the banks of a RAM card > 128KB under software control with a HP48SX.

Only a HP48GX has a bank switcher logic for card slot 2, and only for the slot 2. This hardware logic adds 5 additional address lines for max. 2^5 = 32 banks. Slot 1 of the GX can only handle a 128KB RAM card like the SX.

So if somebody know, how this super duper 256KB RAM card is able to switch his banks under software control in a SX, please tell me. I'll try to implement this immediately into Emu48. ;-)


Moin Christoph,

I can't tell of course. But the discussion here sounds like it is possible?

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RE: '91 TDS 256KB RAM Card for the HP-48 SX - Guenter Schink - 03-19-2015 08:16 PM

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