tty and video displays

Curious Marc curiousmarc3 at
Tue Dec 15 20:52:05 CST 2020

For these interested on how it looked, I posted a picture of all the characters created by the HP 2641 APL ROM dumps here: (somewhere down in the middle of the page). ROM dumps were from Al Kossow I believe (thanks Al).

> On Dec 14, 2020, at 9:00 PM, Gavin Scott via cctalk <cctalk at> wrote:
> Now I want to know if you have a list of the Burroughs APL
> overstrikes, since HP included many more overstrike characters in the
> HP 2641A than the ones that they needed for APL\3000, including (or so
> I'm lead to believe) all the Burroughs extended I/O quad overstrikes,
> presumably to maximize the market for the terminal and/or because they
> thought they might implement the same functionality at some point. So
> it would be interesting to know what was actually missing.
> The overstrike character ROM for the HP 2641A includes 63 characters,
> but (IIRC) only something like 21 are used in APL\3000.
> P.S. My HP 2641A emulation will be in the next official MAME release
> thanks to F.Ulivi who merged it into his existing HP 2645A driver and
> got it submitted upstream.
> G.
>> On Mon, Dec 14, 2020 at 10:28 PM Stan Sieler via cctalk
>> <cctalk at> wrote:
>> That meant that we couldn't use the terminal at Burroughs, because our APL
>> had a few overstrikes that weren't in the table.

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