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  • Petrofsky's Avatar
    May 15th, 2019, 07:04 PM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    I should mention that taos23 doesn't have the original two-crystal PAL board (labeled "8709296 REV A"). He has the later single-clock PAL board (REV...
    26 replies | 628 view(s)
  • Petrofsky's Avatar
    May 15th, 2019, 06:42 PM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    Hey Larry, when I tried to respond to your private message I got "ldkraemer has exceeded their stored private messages quota and cannot accept...
    26 replies | 628 view(s)
  • Petrofsky's Avatar
    May 15th, 2019, 05:22 PM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    To test my theory that columns 0 and 7 are being ANDed, I'll predict that even through column 7 doesn't show up in m and w characters, it shows up...
    26 replies | 628 view(s)
  • Petrofsky's Avatar
    May 15th, 2019, 05:08 PM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    Ah, so you do not have a gate-array motherboard (and the 14-pin DIP in U17 is unrelated to the problem). From your photos, it appears all your...
    26 replies | 628 view(s)
  • Petrofsky's Avatar
    May 15th, 2019, 08:43 AM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    Btw, here's a picture of the font in the standard Model 4 character generator (part 8049007). You can see column 7 is pretty sparsely used, and...
    26 replies | 628 view(s)
  • Petrofsky's Avatar
    May 15th, 2019, 08:31 AM
    Petrofsky replied to a thread Model 4 Font in Tandy/Radio Shack
    I was going to guess the problem was in the line from pin 17 of U19 (the font ROM) to pin 33 of U17 ("Vidarray", the video support gate-array chip)....
    26 replies | 628 view(s)
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About Petrofsky

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About Petrofsky
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Hello, my name is: ALAN PETROFSKY
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