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This commit is contained in:
Akamaki
2025-02-18 22:46:18 +09:00
parent 5314f519ad
commit 2c78e7bb2f
4 changed files with 23 additions and 7 deletions
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6
src/machine/m_ps2_mca.c
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@@ -1890,7 +1890,11 @@ machine_ps55_model_50t_init(const machine_t* model)
* Planar ID
* FFFAh - PS/55 model 5551-S0x, T0x (stage 1?)
* FFEEh - PS/55 model 5551-S1x, T1x (stage 2?)
* POST (P/N 38F6933) determination: FBxx -> 4 slots (error), xxEE -> 5 slots (ok), others -> 8 (error)
* Verification in BIOS P/N 38F6933: FBxx -> 4 slots (error), xxEE -> 5 slots (ok), others -> 8 (error)
*
* The only difference between S and T models is the CPU speed (16 MHz vs 20 MHz).
* The POST measures the speed, and sets a flag in the BIOS Data Area to indicate the sub model.
* The VM in 86Box runs faster than the real, so the POST always determines it as the T model.
*/
ps2.planar_id = 0xffee;
ps55_mca_board_model_50t_init();