15-01-2022, 05:33 PM
As it says in the Engineering Notes
UPGADING TO PC85 version II
All coreboards, versions 8328-4 and 8328-6, will take 27128
EPROMs in the PAK locations. Some early PC85's had 8328-2
coreboards and these have to be modified to use 27128 EPROMs.
So I thought why not add something to the upper 8kb of Rom C, the Wordbee rom, PAK 0. I burnt out a 27128 with Wordbee in the 1st 8k and the Keyboard version of Survivor in the 2nd 8k. Tested it in ubee512 and all works as expected, I hit W from the main menu and Wordbee starts. Hit RUTURN from the Menu and now PAK 8 shows up, select it and Survivor starts.
So I now burnt out a 27128 eprom with the file and replaced my ROM C with it. Powered up the PC85, select W form the Menu and Survivor starts
From the command Menu there is no PAK 8 and PAK 0 is listed as User rom. I also tried it in my Prem PC85 with the same results. Both have the 8328-4-03 coreboard. Could it be something to do with the jumpers under the ROM, but I cant find any reference to them in the documentation.
UPGADING TO PC85 version II
All coreboards, versions 8328-4 and 8328-6, will take 27128
EPROMs in the PAK locations. Some early PC85's had 8328-2
coreboards and these have to be modified to use 27128 EPROMs.
So I thought why not add something to the upper 8kb of Rom C, the Wordbee rom, PAK 0. I burnt out a 27128 with Wordbee in the 1st 8k and the Keyboard version of Survivor in the 2nd 8k. Tested it in ubee512 and all works as expected, I hit W from the main menu and Wordbee starts. Hit RUTURN from the Menu and now PAK 8 shows up, select it and Survivor starts.
So I now burnt out a 27128 eprom with the file and replaced my ROM C with it. Powered up the PC85, select W form the Menu and Survivor starts
From the command Menu there is no PAK 8 and PAK 0 is listed as User rom. I also tried it in my Prem PC85 with the same results. Both have the 8328-4-03 coreboard. Could it be something to do with the jumpers under the ROM, but I cant find any reference to them in the documentation.
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ChickenMan
ChickenMan