4 Dec
2025
4 Dec
'25
1:44 a.m.
On Wed, 3 Dec 2025, jim stephens wrote:
LGB-30, drum memory from an LGB-21.
It is spelled LGP-30 and LGP-21 ;-)
The LGP-21 has a disk with 32 tracks and 128 sectors per track instead of
a drum with 64 tracks and 64 sectors per track as in the LGP-30.
There were memory extension modifications for the LGP-21, though. And I
have LGP-21 modules that replace the on-disk registers with
semiconductor shift registers and also add some more registers.
Christian