IBM 5550: Add the Font 16 display adapter#6828
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Fix a bug that the make code is sent when the 5576-001 emulation is enabled and the key is released.
Added cursor blinking controlled by CRTC (HD46505).
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DOS K3.44 boot disk modified for the Font 16 system |
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Summary
Add the IBM 5550 Font 16 system (model 5551-Axx configuration).
The system requires the Font 16 version of the IBM 5550 DOS (Program Number 5600JBP, 5600JBD, 5600JBC). This version probably has the same BIOS with the Font 24 version, but comes with 9x21 and 16x16 fonts. I don't have these files, so I had to covert 8x19 and 16x16 DOS/V fonts into another format. Also, as I mentioned in the previous PR #6788 , the machine uses a special disk format whose boot sector contains an address table to load the DOS. Its format is different between 5-inch and 3.5 inch disks. The available version of 5550 DOS (Version K3.44, P/N 5605JYN) is provided with the 3.5-inch format, so I had to modify the boot sector.
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