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Using a 1M RAM card in 48GX slot 1
12-24-2019, 11:35 PM
Post: #4
RE: Using a 1M RAM card in 48GX slot 1
Schematics here:

https://www.hpcalc.org/details/3543

Port 2 Pins 31, 32, 33, 34, 35, are connected to Address lines A17, A18, A19, A20 and A21.

While Equivalent Port 1 Pins, are connected to EA17, EA18, LCDclk, LCDsync, LCDd1.

Not enough details to tell if LCD lines can be disabled by software. Probably no. They will be continuously changing state.

One possibility is to cripple the card by cutting the lines 33, 34, 35 and probably 36 ( Not sure on what the BEN signal is for), leave the connector side open, ground them internally, but I will not recommend it.

Adrian Coto
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RE: Using a 1M RAM card in 48GX slot 1 - acoto - 12-24-2019 11:35 PM



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