Info-IBMPC@USC-ISIB.ARPA (09/28/84)
From: Info-IBMPC Digest <Info-IBMPC@USC-ISIB.ARPA> Date: Sat, 22 Sep 84 9:33:52 EDT From: Dave Farber <farber%udel-eecis3.delaware@udel-relay.ARPA> To: info-ibmpc@usc-isib.ARPA Subject: Lotus on PCjr My account got mussed up so I'm using my Dad's. (manny@udel-eevax) As soon as I got a 128K memory expander for my PCjr, I tried to bring Lotus 1-2-3 up on it. Everything worked fine except for one thing: I couldn't display any graphs; the screen displayed semi-gibberish instead. This was due to some hardware incompatibilities between the PC and the PCjr's color adapters; namely, the ports are different. So, I looked in the graphics display driver (use IBM1G2.DRV, on the utility disk) and found the offending code, and replaced it with code that would use the ROM-BIOS to change display modes. To make the change (for Lotus 1-A), do the following: DEBUG GD.DRV (GD.DRV should be a copy of IBM1G2.DRV) A 1b7 MOV AX,4 INT 10 [return] F 1bc 1c9 90 (this replaces the rest of the offensive code with NOP's) W Q - Manny If anyone has questions drop me a line. p.s. One could also use the extra code space to select the PCjr's palette. Does anyone out there know any other PCjr tricks, like how to get Bluebush Chess to work with the PCjr's display? -------